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Some objects, like a sponge, change shape __________. They return to their original shape when the force stops acting on them.
temporarily
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An __________ is a ramp that we use to move objects up and down. It reduces the force we need to push an object.
inclined plane
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A __________ is a simple machine that turns on a fixed point and makes it easier to lift heavy objects.
lever
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The fixed point in a lever is called a __________ or a __________.
fulcrum, pivot point
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Some forces can act on an object at a distance. These are called __________. For example: gravity and magnetism.
non-contact forces
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__________ can make an object start moving, stop moving, change shape or break.
Forces
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___________ is a force that attracts some metals. It flows from the north pole to the south pole.
Magnetism
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__________ is a force that pulls objects down towards Earth. We see the effct of this force when an apple falls from a tree.
Gravity
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__________ is a force that occurs when two objects rub against each other. It slows down moving objects.
Friction
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Some objects break when a lot of force is applied to them. These are __________ objects.
rigid
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The same poles of two magnets __________ each other.
repel
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A simple machine has __________ parts, but a complex machine is made of many parts.
only one or a few
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The opposite poles of two magnets __________ each other.
attract
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Some objects, like clay, change shape __________ when a force is applied to them. They keep their new shape.
permanently
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A magnet has two __________, north and south.
poles
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Are the machines in the picture simple or complex?
They are simple machines.
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