Force, work and energy

In which of the following activities is force used for pulling?

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Which of the statements is not true

• Friction makes a moving object slow down

• Friction decreases the roughness of an object

• Friction enables on object to stay in a stationary position

• Friction is opposite to the force

Which of the following can be done using muscular force?

• Changing the direction of a moving object

• Stopping a moving body

• Changing one type of body to another type of body

• Increasing or decreasing the speed of the body

What is the effect of force applied when a rubber band is stretched?

• Change in direction

• Change from rest to motion

• Change in shape

• Change in speed

Which energy is associated in the following:

Food is cooking on the stove

• Heat

• Electrical

• Hydro

• All the above

Read the statements carefully and choose the correct option:

Statement A: we get energy from the food we eat.

Statement B: we need energy to do work.

• Statement A is correct B is wrong

• Statement B is correct A is wrong

• Both the statements are correct

• Both the statements are wrong

Ability to do work is called

• Force

• Gravity

• Energy

• None of these

Substances that gets attracted towards magnet are

• Magnetic

• All

• Plastic

• Wooden

A football is kicked by a boy. It rolls on the ground to some distance and stops. The force which stops the ball is

• Muscular force

• Gravitational force

• Mechanical force

• Frictional force

Hydro energy: water :: solar energy : ??

• Sun

• Wind

• Water

• Moon