Force, Work, Energy

A special inclined plane wrapped around a cylinder

• Wedge

• Screw

• Lever

• Pulley

We can walk on earth and do not float in air because of

• Muscular force

• Elastic force

• Gravitational force

• Frictional force

Roller skates are examples for

• Inclined plane

• Wedge

• Lever

• Wheel & Axle

Work means any mental or physical activity

• True

• False

_______ is used for generating electricity and making atom bombs

• Hydro energy

• Wind energy

• Atomic energy

• Geothermal energy

________ are natural substances that have chemical energy stored in them

• Dams

• Fuels

• Atom

• Sun

Cricket coaches use bowling machine to throw balls faster and with more speed. Its an example for:

• elastic force

• muscular force

• frictional force

• mechanical force

A force can cause things to:

• Start or stop moving

• Change the shape

• Change position or direction

• All the above

To stop a trolley from sliding down a slope, you apply a force in the opposite direction. The force is:

• Gravitational

• Mechanical

• Frictional

• Muscular

Simple machines are tools that enable us

• To do work easily

• In less time

• Less effort

• All the above