Does this surface look rough or smooth? Why? Friction?
Rough! It is covered with many bumps and groove which increase friction when surfaces rub together.
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thief
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gold
Win 50 points!
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rocket
Go to first place!
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thief
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15
Name the force that slows things down
Friction
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seesaw
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seesaw
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shark
Other team loses 20 points!
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banana
Go to last place!
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What happens when you kick a ball on the grass?
roll, slow down, stop. Friction between the ball and the grass slows the ball. Friction causes the ball to slow and stop. If there were no friction, the ball wo
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15
This is a force that pulls everything to the ground.
Gravity
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When do you need to apply more force? Pushing a heavy box on ice floor or grass?
Grass! Friction also makes it harder to push objects across rough surfaces. You need more force to push an object on a rough surface than on a smooth one.
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15
When does friction happen?
Friction takes place when object runs against each other.
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Why is frction helpful?
walk, slide on a sheet of ice. brakes use friction to slow down and stop a moving car.
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Is the friction more or less when the ground is slippery?
Less Friction. Smooth surfaces has less or no bumps and they make it easier to push objects.
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seesaw
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shark
Other team loses 20 points!
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gift
Win 5 points!
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thief
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15
Does this surface smooth or rough? Why?
Smooth! Smooth surfaces have much smaller bumps.
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Is the friction more or less when you rub your book against a towel?
More friction. Because towel has a rough texture. More bumps make the object hard to move.
