work, energy, forces and simple machines

what is energy?

• the ablity to do work

• to use a force

• to accelerate an object

• to move an object

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Something that changes the speed, direction, or shape of another object by pushing or pulling on it.

• force

• motion

• science

• sponge bob

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A force that stops or slows down the motion of objects.

• applied force

• frictional force

• electrical force

• magnetic force

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Work is done when a force causes an object to ...

• move

• stay still

• slow down

• sink

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This is the energy of motion

• kinetic energy

• potential energy

• sound energy

• electrical energy

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How many laws of motion are there?

• 1
• 2
• 3
• 100

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When we throw a ball into air, it falls back. The force responsible for this is

• muscular force.

• gravitational force.

• mechanical force

• none of these

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An electric heater converts

• heat energy to electrical energy.

• electrical energy to heat energy.

• light energy to electrical energy.

• electrical energy to muscular energy.

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In a battery cell, energy is stored in the form of

• electrical energy.

• muscular energy

• chemical energy.

• solar energy

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The given transformation takes place in - light to electrical energy

• electric bulb

• electric heater

• battery cell

• solar cell

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