Force Questions

In physics, force is any action that changes or maintains the motion of an object.

The idea of force is generally described with the help of Newton’s laws of motion. According to the first law of motion, a body moving at a constant speed in a straight line or at rest will continue to be in that state until some external force is applied. The second law states that when an outside force acts on an object, it generates an acceleration or change in the object’s velocity in the direction of the force. The acceleration value is directly proportional to the amount of matter in the body. Newton’s third law says that when one object exerts a force on another object, the second object exerts an equal and opposite force on the first object. This law explains why a force tends to change the shape of an object, whether or not it makes the object move. The deformation of an object can generally be ignored when analysing its motion.

The measuring unit of force is the newton. It is denoted by the symbol N. A newton is the force required to accelerate an object having one-kilogram weight by one meter per second square. The equation F = ma is used to find the number of newtons needed to decrease or increase the velocity of a given object.

In classical mechanics, there are two types of forces; contact forces and non-contact forces. Contact forces include frictional force, tension force, normal force, etc. Non-contact forces include gravitational force, electrical force, magnetic force, etc.

The video explains the concept of force and its various types.

1) What is a force?

A force is any action that changes or maintains the motion of an object.

2) Explain force in Newton’s laws of motion.

The idea of force is generally described with the help of Newton’s laws of motion. According to the first law of motion, a body moving at a constant speed in a straight line or at rest will continue to be in that state until some external force is applied.

The second law states that when an outside force acts on an object, it generates an acceleration or change in the object’s velocity in the direction of the force. The acceleration value is directly proportional to the amount of matter in the body.

Newton’s third law says that when one object exerts a force on another object, the second object exerts an equal and opposite force on the first object. This law explains why a force tends to change the shape of an object, whether or not it makes the object move.

3) What are the two types of forces in classical mechanics?

In classical mechanics, there are two types of forces; contact forces and non-contact forces. Contact forces include frictional force, tension force, normal force, etc. Non-contact forces include gravitational force, electrical force, magnetic force, etc.

4) What is the SI unit of force?

Newton is the SI unit of force.

5) What is the aggregate of all forces exerted on an object called?

The net force is the sum of all forces exerted on a body.

6) What is another name for Newton’s first law of motion?

Law of Inertia is another name for Newton’s first law of motion.

7) What is the formula of weight?

F = m × g

m = mass of the given object

g = acceleration due to gravity

8) When a body is in motion, in which direction does friction act?

The friction acts in the opposite direction to the motion of the body.

9) What are the quantities that force can change?

Force can change the speed, shape,and direction of an object.

10) What is meant by weight?

Weight is a measurement of the force of gravity exerted on a body.

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Practice Questions

1) What is the first law of motion?

2) What is the universal law of gravitation?

3) Who discovered gravitational force?

4) What is the value of acceleration due to gravity on Earth?

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