Newton Law of Motion
Science

Q1: What are Newton’s three laws of motion?

A1: Newton’s three laws of motion are:

  1. The law of inertia: An object at rest tends to stay at rest, and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced external force.
  2. The law of acceleration: The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (F = ma).
  3. The law of action and reaction: For every action, there is an equal and opposite reaction. When one object exerts a force on another object, the second object exerts an equal force in the opposite direction.

Q2: What is the law of inertia?

A2: The law of inertia, often referred to as Newton’s first law of motion, states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an unbalanced external force. In other words, objects tend to maintain their state of motion (or lack thereof) unless a force is applied to change it.

Examples of Inertia in Daily Life :-

  1. People stumble forward as the bus abruptly stops. The top part of the body continues to move forward due to inertia of motion when the driver of a bus abruptly brakes, but the bottom section of the body comes to rest along with the bus. As a result, the body experiences a forward force, which causes us to tumble forward.
  1. After the electricity is switched off, the electric fan keeps running for a while. The fan’s blades were turning. As a result, they       require some time to fall asleep after being turned off.

 

Q3: How does the mass of an object affect its acceleration according to Newton’s second law?

A3:  According to Newton’s second law of motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. In simpler terms, if you apply a greater force to an object, it will accelerate more, and if you increase the object’s mass, it will accelerate less for the same force. Numerically , F= Ma . Here , if Mass is constant , then force is directly proportional to acceleration .

Q4: Can you provide an example of Newton’s third law of motion?

A4: An example of Newton’s third law of motion is the action-reaction pair involved in walking. When you walk, your foot exerts a backward force on the ground (action), and in response, the ground exerts an equal and opposite forward force on your foot (reaction). This backward-forward pair of forces allows you to move forward.

Q5: How does Newton’s second law relate force, mass, and acceleration mathematically?

A5: Newton’s second law relates force (F), mass (m), and acceleration (a) through the equation F = ma. In this equation, force is measured in newtons (N), mass is measured in kilograms (kg), and acceleration is measured in meters per second squared (m/s²). This formula quantifies the relationship between the force applied to an object, the object’s mass, and the resulting acceleration.

 

Q6: Why is it important to wear seatbelts in a moving car according to Newton’s laws of motion?

A6: Wearing seatbelts is essential for safety in a moving car because of Newton’s laws of motion. When a car suddenly stops due to a collision or braking,   the passengers  continue to move forward at their original speed (inertia). Without seatbelts, they would keep moving until they hit something inside the car or are ejected from it. Seatbelts apply a restraining force to bring the passengers to a stop along with the car, reducing the risk of injury.

 

Q7: How do astronauts experience weightlessness in space, and which of Newton’s laws explains this phenomenon?

A7: Astronauts experience weightlessness in space because they are in a state of freefall around the Earth. This phenomenon is explained by Newton’s first law of motion (law of inertia). In space, there is no air resistance or significant gravitational resistance to counteract an object’s initial motion. Therefore, when astronauts and their spacecraft are in orbit, they continuously fall towards the Earth but also move forward at such a speed that they remain in orbit, creating the sensation of weightlessness.

Q8: What is the significance of understanding Newton’s laws of motion in everyday life and various fields of science and engineering?

A8: Understanding Newton’s Law of Motion is significant because they provide the foundation for comprehending the behavior of objects in motion and the effects of forces in various contexts. These laws are essential in fields such as physics, engineering, aeronautics, and automotive design. They help in designing safe vehicles, predicting the motion of celestial bodies, and developing technology for space exploration, among many other practical applications. Additionally, an understanding of these laws promotes safe practices and enhances our ability to explain and solve real-world problems involving motion and force.

 

Here are 100 fill-in-the-blank questions along with answers related to the laws of motion. The questions cover Newton’s three laws of motion, and the answers are provided in simple English.

 

  • Law: An object at rest stays at rest, and an object in motion stays in motion unless acted upon by a ______.
  • Answer: force.

 

  • Law: The rate of change of momentum of an object is directly proportional to the ______ applied to it.
  • Answer: force.

 

  • Law: For every action, there is an equal and opposite ______.
  • Answer: reaction.

 

  • Formula: The second law of motion is often represented by F = ______.
  • Answer: ma (mass times acceleration).

 

  • The unit of force is called the ______.
  • Answer: Newton.

 

  • Newton’s third law of motion applies to all actions and reactions, whether they are ______ or not.
  • Answer: visible.

 

  • The force that opposes motion and acts in the opposite direction is called ______.
  • Answer: friction.

 

  • When you push against a wall, the wall pushes back with an equal and opposite ______.
  • Answer: force.

 

  • The tendency of an object to resist any change in its motion is called ______.
  • Answer: inertia.

 

  • If the net force acting on an object is zero, then the object will maintain its current state of ______.
  • Answer: motion.

 

  • Gravitational force acts on all objects with ______.
  • Answer: mass.

 

  • If you slide a book across a table and it slows down, it’s because of the force of ______.
  • Answer: friction.

 

  • The first law of motion is also known as the law of ______.
  • Answer: inertia.

 

  • When you are in a moving car and it stops suddenly, your body continues to move forward because of ______.
  • Answer: inertia.

 

  • The acceleration of an object is directly proportional to the ______ and inversely proportional to its ______.
  • Answer: force, mass.

 

  • The force exerted by an object in motion is a product of its mass and ______.
  • Answer: acceleration.

 

  • A seatbelt helps provide safety in a car by exerting a force in the ______ direction of your motion when the car stops suddenly. Answer: opposite.

 

  • The gravitational pull between two objects increases with the ______ of the objects and decreases with the ______ of the distance between them.
  • Answer: mass, square.

 

  • In a vacuum, where there is no air resistance, all objects fall at the same ______.
  • Answer: rate.

 

  • Air resistance is a type of ______ that acts against the motion of objects through the air.
  • Answer: friction.
  • The motion of a pendulum is an example of ______ motion.
  • Answer: periodic.

 

  • When you jump off a diving board, gravity pulls you downward, while your inertia continues the motion ______.
  • Answer: forward.

 

  • When riding a horse, the horse exerts a force on the ground, and the ground exerts an equal and opposite force on the ______. Answer: horse.

 

  • The friction that acts on rolling objects is called ______ friction.
  • Answer: rolling.

 

  • The force exerted by a string on an object moving in a circle is called ______ force.
  • Answer: centripetal.

 

  • In the absence of external force, the total momentum before collision is equal to the total momentum after collision. This is known as the law of ______ of momentum.
  • Answer: conservation.

 

  • The acceleration produced by a force acting on an object is in the ______ direction as the force.
  • Answer: same.

 

  • If the action is the Earth pulling on an object, the reaction is the object pulling on the ______.
  • Answer: Earth.

 

  • If you double the mass of an object while applying the same force, the acceleration will be ______.
  • Answer: halved.

 

  • In space, where there is no air resistance, objects continue to move in a straight line due to the lack of ______.
  • Answer: friction.

 

  • The measure of an object’s resistance to changes in rotational motion is called ______.
  • Answer: rotational inertia.

 

  • When an ice skater pulls in her arms, she spins faster due to the conservation of ______ momentum.
  • Answer: angular.

 

  • An object moving in a straight line is said to be in ______ motion.
  • Answer: linear.

 

  • A force that acts at a distance, like gravity, is known as a ______ force.
  • Answer: non-contact.

 

  • The force exerted by a stretched or compressed spring is described by ______ Law.
  • Answer: Hooke’s.

 

  • For objects moving in a circle, the net force and the acceleration are directed towards the ______ of the circle.
  • Answer: center.

 

  • The force that keeps an object moving in a circle is always directed ______ to the path of the object.
  • Answer: perpendicular.

 

  • The product of an object’s mass and velocity is known as its ______.
  • Answer: momentum.

 

  • The force that always acts perpendicular to the surface in contact is called the ______ force.
  • Answer: normal.

 

  • If you triple the force applied to an object and keep the mass constant, the acceleration will ______.
  • Answer: triple.
  • When two objects collide and stick together, it is called a(n) ______ collision.
  • Answer: inelastic.

 

  • If you double both the mass and the force applied to an object, the acceleration will remain the ______.
  • Answer: same.

 

  • The friction that exists between stationary objects is called ______ friction.
  • Answer: static.

 

  • Newton’s laws of motion apply to objects of any size, whether they are ______ or microscopic.
  • Answer: macroscopic.

 

  • If no net external force acts on a system of particles, the total momentum of the system ______.
  • Answer: remains constant.

 

  • When a car rounds a curve, the passengers feel a force pushing them to the outside of the curve due to ______.
  • Answer: inertia.

 

  • A force that is exerted only when two objects are touching is a ______ force.
  • Answer: contact.

 

  • The sum of all the forces acting on an object is called the ______ force.
  • Answer: net.

 

  • In a vacuum, a feather and a hammer will fall at the same ______.
  • Answer: rate.

 

  • According to Newton’s third law, forces always occur in ______.
  • Answer: pairs.

 

  • The resistance an object encounters when moving over another is referred to as ______.
  • Answer: friction.

 

  • The force that keeps planets in orbit around the Sun is the force of ______.
  • Answer: gravity.

 

  • In physics, work is done when a force causes an object to move in the ______ direction as the force.
  • Answer: same.

 

  • The friction that exists when an object is moving is called ______ friction.
  • Answer: kinetic.

 

  • A push or pull on an object is called a(n) ______.
  • Answer: force.

 

  • When you walk, your foot pushes backward against the ground, and the ground pushes your foot ______.
  • Answer: forward.

 

  • If the mass of an object is constant, then the force is equal to the mass times the ______.
  • Answer: acceleration.

 

  • When a bullet is fired from a gun, the bullet moves forward, and the gun moves ______.
  • Answer: backward.

 

  • The force of gravity on an object is also known as its ______.
  • Answer: weight.

 

  • When two objects collide and bounce off of each other, it is called a(n) ______ collision.
  • Answer: elastic.

 

  • The force of attraction between two masses is known as ______.
  • Answer: gravitational force.

 

  • When you push a shopping cart, the force exerted by the cart on your hands is in the ______ direction to the force you apply. Answer: opposite.

 

  • The more massive an object is, the ______ inertia it has.
  • Answer: more.

 

  • The ability of an object to resist a change in its state of motion is called ______.
  • Answer: inertia.

 

  • A moving car has ______ energy.
  • Answer: kinetic.

 

  • The force with which the Earth pulls objects towards itself is called ______.
  • Answer: gravity.

 

  • When you increase the surface area in contact, the ______ friction generally increases.
  • Answer: friction.

 

  • When the only force acting on a falling object is gravity, the object is said to be in ______.
  • Answer: free fall.

 

  • The net force acting on an object moving with constant velocity is ______.
  • Answer: zero.

 

  • A force can do work only when it is exerted in the ______ direction in which the object moves.
  • Answer: same.

 

  • A force that results from the actions of two objects on each other is called a(n) ______ force.
  • Answer: interaction.

 

  • If you stand on a skateboard and throw a ball forward, the skateboard will roll ______.
  • Answer: backward.

 

  • Objects at rest have ______ energy.
  • Answer: potential.

 

  • If you decrease the mass of an object while applying the same force, the acceleration will ______.
  • Answer: increase.

 

  • If you pull a wagon, the wagon pulls you back with an equal and opposite ______.
  • Answer: force.

 

  • The total amount of momentum in a closed system is ______.
  • Answer: conserved.

 

  • When an object is in equilibrium, the net force acting on it is ______.
  • Answer: zero.

 

  • The natural frequency at which an object vibrates is called its ______ frequency.
  • Answer: resonant.

 

  • The force exerted by a fluid on an object moving through it is called ______.
  • Answer: drag.

 

  • The frictional force between an object and the fluid through which it moves is called ______.
  • Answer: fluid friction.

 

  • A rocket can move in space because of the principle of conservation of ______.
  • Answer: momentum.

 

  • When a force is exerted on an object but does not cause it to move, no ______ is done on the object.
  • Answer: work.

 

  • An object’s weight is equal to its mass times the acceleration due to ______.
  • Answer: gravity.

 

  • A car’s speedometer measures its ______.
  • Answer: speed.

 

  • When two objects of unequal mass are acted upon by equal forces, the less massive object will have a ______ acceleration. Answer: greater.

 

  • A stretched rubber band has ______ energy.
  • Answer: potential.

 

  • If you cut the distance between two objects in half, the gravitational force between them becomes ______ times stronger. Answer: four.

 

  • The quantity that describes how much an object’s velocity changes in a specific amount of time is called ______.
  • Answer: acceleration.

 

  • An object moving at a constant velocity has an acceleration of ______.
  • Answer: zero.

 

  • A(n) ______ is a vector quantity that refers to “how much ground an object has covered” during its motion.
  • Answer: displacement.

 

  • A spinning skater’s arms are outstretched, she has less ______ than when her arms are close to her body.
  • Answer: rotational speed.

 

  • The tendency of an object to maintain its state of rest or uniform motion is referred to as ______.
  • Answer: inertia.

 

  • The third law of motion explains why rocket engines work; they expel exhaust gas backward, and the rocket is pushed ______. Answer: forward.

 

  • If you know the mass of an object and the net force applied to it, you can calculate its ______.
  • Answer: acceleration.

 

  • A force has both magnitude and ______.
  • Answer: direction.

 

  • The greater the mass of the object, the greater the ______ required to move it.
  • Answer: force.

 

  • The force that opposes motion between two surfaces that are touching is ______.
  • Answer: friction.

 

  • An object’s acceleration is in the opposite direction to the net force if the force is ______.
  • Answer: negative.

 

  • If you increase the force and keep the mass constant, the acceleration will ______.
  • Answer: increase.

 

  • The effect of a force on an object’s motion depends on its mass and its ______.
  • Answer: acceleration.

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