REVISION TEST CH# 8

The ability to do work is called....

• Power

• Energy

• Force

How many types of simple machines are there?

• Four

• Five

• Six

Different amounts of force have ..,............ effect

• Different

• Same

• Many

Which one is a natural force?

• Force of bulldozer

• Muscular force

• Gravity

Which instrument is used to measure force?

• Spring balance

• Digital balance

• Physical balance

The unit of force is ......

• Kilogram

• Newton

• Meter/ sec

Inertia is a force

• Which allows objects remain in motion

• Create resistance to change in objects movement

• Create friction between two surfaces

Birds can move quickly through air because of

• Streamlined shape

• Due to feathers

• Thin bones

Friction produces..............

• Sound

• Heat

• Both sound and heat

Oil and grease can reduce friction because these are

• Viscous

• Liquid

• Lubricants