Physics Chapter: Understanding Forces

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What is the definition of force?

A physical cause that changes the state of rest or motion of an object (correct)
The distance an object moves
A change in temperature
The weight of an object

A force can only be applied by a person.

False (B)

Name one everyday example of a force.

Opening a door

A force applied to an object can result in a change in _______.

motion Signup and view all the answers

Match the following actions with their types of force:

Opening a door = Push Pulling a rope = Pull Kicking a ball = Push Stretching a rubber band = Pull Signup and view all the answers

Which of the following is an example of a non-contact force?

Magnetic force (D) Signup and view all the answers

Friction always speeds up the motion of objects.

False (B) Signup and view all the answers

What force is responsible for a plastic comb attracting small bits of paper?

Electrostatic force Signup and view all the answers

What type of force always opposes the motion of one body over another?

Frictional Force (A) Signup and view all the answers

In non-contact forces, _______ is an example that involves pulling iron objects.

magnetic force Signup and view all the answers

Match the types of forces with their descriptions:

Muscular Force = Force generated by muscles used by animals Contact Forces = Forces applied when objects touch Electrostatic Force = Force exerted without contact through electric charges Friction = Force that opposes motion between surfaces in contact Signup and view all the answers

A non-contact force requires objects to be in direct contact with each other.

False (B) Signup and view all the answers

What happens to a moving object when a force is applied in the opposite direction of its motion?

The object slows down. Signup and view all the answers

A force applied on an object by another object that is in direct contact with it is called a __________.

contact force Signup and view all the answers

Match the following types of forces with their examples:

Frictional Force = Stopping a moving boat Muscular Force = Lifting an object Electrostatic Force = Attraction of paper by a rubbed pen Gravitational Force = Falling of an apple from a tree Signup and view all the answers

What happens when two forces act in the same direction on an object?

The resultant force is equal to the sum of the forces. (B) Signup and view all the answers

When two equal forces act in opposite directions, the resultant force is equal to the sum of the forces.

False (B) Signup and view all the answers

What is the SI unit of force?

newton Signup and view all the answers

A push or a pull is considered a _____ force.

force Signup and view all the answers

Match the following forces with their effects:

Push = Makes a stationary object move Pull = Changes the shape of an object Resultant Force = Net effect of all forces acting on an object Magnitude = Strength of a force Signup and view all the answers

Electrostatic force is a contact force.

False (B) Signup and view all the answers

What happens to the nails when a container is placed on the wooden board?

The nails sink into the wooden board. Signup and view all the answers

The force acting normally per unit area of a surface is called ____.

pressure Signup and view all the answers

Match the following forces with their descriptions:

Electrostatic Force = Non-contact force due to charged objects Gravitational Force = Attraction between masses Frictional Force = Resists relative motion between surfaces Thrust = Force acting normally on a surface Signup and view all the answers

Which of the following factors does pressure depend on?

Area over which the force acts (B) Signup and view all the answers

When lifting a bucket, we do not apply any force against gravity.

False (B) Signup and view all the answers

____ Pascal is known for his work on fluids and pressure.

Blaise Signup and view all the answers

What happens to an object at rest when a force is applied to it?

It moves in the same direction of the applied force. (A) Signup and view all the answers

Squeezing a toothpaste tube involves pushing the tube to get the paste out.

False (B) Signup and view all the answers

What is the measure of force's strength called?

magnitude Signup and view all the answers

A body is _____ when a force applied to it increases its length in the direction of the applied force.

stretched Signup and view all the answers

Match the following actions with their descriptions:

Pulling = Moving an object towards oneself Pushing = Moving an object away from oneself Squeezing = Changing the shape of an object Lifting = Raising an object upward Signup and view all the answers

Which of the following describes a force due to interaction?

Forces can only be applied when two objects interact. (C) Signup and view all the answers

The size and shape of an object are irrelevant to its description.

False (B) Signup and view all the answers

What is an example of a situation where a force is applied to move an object?

A boy pushing a door. Signup and view all the answers

Force

A physical cause that changes or tends to change the state of rest or motion of an object.

Force examples

Pushing, pulling, throwing, kicking, stretching, squeezing are examples of applying force.