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10
×
Some objects break when a lot of force is applied to them. These are __________ objects.
rigid
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10
×
A simple machine has __________ parts, but a complex machine is made of many parts.
only one or a few
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10
×
The opposite poles of two magnets __________ each other.
attract
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10
×
__________ is a force that occurs when two objects rub against each other. It slows down moving objects.
Friction
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10
×
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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10
×
The same poles of two magnets __________ each other.
repel
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×
seesaw
Swap points!
Oops!
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star
Double points!
Okay!
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gift
Win 25 points!
Okay!
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thief
Give points!
5
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15
20
25
10
×
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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10
×
Are the machines in the picture simple or complex?
They are simple machines.
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10
×
The fixed point in a lever is called a __________ or a __________.
fulcrum, pivot point
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10
×
__________ 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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10
×
A magnet has two __________, north and south.
poles
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10
×
A __________ is a simple machine that turns on a fixed point and makes it easier to lift heavy objects.
lever
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thief
Give points!
5
10
15
20
25
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gold
Win 50 points!
Okay!
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shark
Other team loses 25 points!
Okay!
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lifesaver
Give 25 points!
Oops!
10
×
Some objects, like clay, change shape __________ when a force is applied to them. They keep their new shape.
permanently
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trap
No points!
Oops!
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fairy
Take points!
5
10
15
20
25
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shark
Other team loses 20 points!
Okay!
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baam
Lose 20 points!
Oops!
×
Restart
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