Force, Work and Energy

An example of a smooth surface placed at an angle is:

• 
• 
• 
• 

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The ability to do work is called __________

• Power

• Energy

• Force

• Friction

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A simple machine that has a grooved wheel and a rope running between the grooves of the wheel.

• Lever

• Pulley

• Wheel and axle

• Screw

The following diagram shows a man pushing a table. Now the man is applying ________ on the table.

• work

• force

• energy

• muscles

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The ultimate source of energy on earth?

• the sun

• coal

• wind

• plants

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A STONE THROWN UPWARDS COMES DOWN BECAUSE OF ______________

• mechanical energy

• kinetic energy

• wind energy

• gravitational force of the earth

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The instruments that make our work easier.

• Force

• Energy

• Gravity

• Machines

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Smoother the surface, ________ the friction

• smoother

• lesser

• more

• equal

A spoon, a pair of scissors, and a long rod are examples of simple machines that can be used to lift or move heavy objects. Identify the simple machine.

• an inclined plane

• a lever

• a pulley

• Wedge

When a pinwheel is placed against the wind, it begins to spin. This proves that ___

• moving air has energy

• pinwheel has life

• pin has energy

• moving air has no energy

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