Forces and Energy Review

An example of force applied in the direction of motion ................... .

• opening a door

• applying brakes suddenly to moving car

• a batsman hitting a cricket ball

• drawing water from a well

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Which of the following is the example of Kinetic energy ?

• A boy is sleeping

• A fan is off

• A car is moving

• A girl watching television

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Slide is an example of .................. .

• pulley

• inclined plane

• wedge

• lever

Frictional force always opposes................. .

• the state of rest

• the state of motion

• Both the states

• None of the above

Why do we sprinkle powder before playing caroms ?

• to increase friction

• to decrease friction

• to increase or decrease the friction depending on the type of the game played

• None of these

Levers are simple machines which have .................... .

• a rod and fulcrum

• a stone and an iron rod

• fulcrum and a stone

• None of these

Energy can be defined as :

• work done in unit time

• A pull or a push

• The capacity to do work

• Attraction between two oppositely charged particles

..................... energy is used to operate and run computers.

• Thermal

• Electrical

• Nuclear

• Solar

Which type of simple machine is a see-saw in the playground ?

• Lever

• Pulley

• Inclined Plane

• Wedge

Which form of energy would move the sleigh ?

• Electrical energy

• Solar energy

• Heat energy

• Mechanical energy

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