Lesson no : 9 Force, Work and Energy

Which of these is an inclined plane wrapped around a nail?

• Screw

• Wedge

• Ramp

• Wheel and axle

In which of these simple machines is the load in the middle?

• Scissors and pliers

• Bottle opener and nutcracker

• Fishing rod and tongs

• All of these

Which of thees is a form of energy that a body possesses due to its movement?

• Potential energy

• Kinetic energy

• Electrical energy

• Heat energy

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NGSS.MS-PS3-5

Which of these is NOT true about energy?

• It is present in many forms

• It can neither be created nor destroyed

• Energy can change its form

• None of these

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A force that occur between two surfaces is called ________

• Friction

• Gravity

__________ makes movement difficult.

• Friction

• Machines

___________ have the special property to pull objects made of iron towards itself.

• Magnet

• Nickel

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A ramp is a common example of _________ .

• an incline plane

• a lever

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__________ is the fixed point around which a lever rotates.

• Fulcrum

• Wheel and axle

The fulcrum is in the middle in class _________ levers.

• One

• Two

• Three