Understanding Friction Quiz

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What is the force that opposes the motion between the surfaces of the book and the table?

Frictional force (correct)

Gravitational force

Electrical force

Magnetic force

What force must be acting on a moving object opposing its motion?

Gravitational force

Magnetic force

Electrical force

Frictional force (correct)

Why does a vehicle slow down when brakes are applied?

Due to decrease in engine power

Due to application of frictional force by brakes (correct)

Due to increase in air resistance

Due to reduction in vehicle weight

Why is it difficult to walk on a smooth and wet floor?

Due to increase in frictional force Signup and view all the answers

What is the reason for a moving ball on the ground to stop after some time?

Application of frictional force Signup and view all the answers

What device is used for measuring the force acting on an object?

Spring balance Signup and view all the answers

Which force causes slipping when stepping on a banana peel?

Frictional force Signup and view all the answers

What happens to the reading on the spring balance when a piece of polythene is wrapped around the brick?

It increases Signup and view all the answers

In the above activity, where is the force of friction acting?

Between the surface of the brick and the floor Signup and view all the answers

What does the distance covered by a pencil cell moving down from a point A on an inclined plane depend on?

The nature of the surface on which the cell moves Signup and view all the answers

What causes friction between two surfaces?

Irregularities on the two surfaces locking into one another Signup and view all the answers

What happens to the force of friction if a rough surface is involved?

The force of friction is greater Signup and view all the answers

What does wrapping a piece of jute bag around a brick demonstrate?

Different materials can affect the force of friction differently Signup and view all the answers

What is stretched when a force is applied to a spring balance?

The coiled spring Signup and view all the answers

What is a force?

A push or a pull Signup and view all the answers

What does the distance moved by an object in unit time indicate?

The object's speed or velocity Signup and view all the answers

What makes an object slow down or go faster?

Force applied on the object Signup and view all the answers

How do fielders stop a ball hit by a batsman?

By applying a force on the ball Signup and view all the answers

What can actions like kicking, hitting, pushing, and pulling be used to describe?

Tasks related to force Signup and view all the answers

What happens to a moving ball on the ground when a force is applied to it?

It may slow down, speed up, or change direction Signup and view all the answers

What is the term used in science for a push or pull on an object?

Force Signup and view all the answers

In the context of motion of objects, can you infer that to move an object, it has to be pushed or pulled?

Yes, it always has to be pushed and pulled Signup and view all the answers

What is the action called in science when an object is lifted?

Lifting Signup and view all the answers

What type of force is exerted when a magnet attracts a piece of iron?

Attractive force Signup and view all the answers

In the scenario of a man standing behind a stationary car, will the car move due to his presence?

No, unless he applies a force Signup and view all the answers

In Fig. 8.3 (a), what do both girls appear to be doing to each other?

Pushing each other Signup and view all the answers

Who is exerting the force in Fig. 8.2 (b) to make the car move?

The man Signup and view all the answers

What happens when similar poles of two magnets repel each other?