Friction takes place when object runs against each other.
Oops!
Check
Okay!
Check
15
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.
Oops!
Check
Okay!
Check
15
Does this surface smooth or rough? Why?
Smooth! Smooth surfaces have much smaller bumps.
Oops!
Check
Okay!
Check
thief
Give points!
5
10
15
20
25
gold
Win 50 points!
Okay!
rocket
Go to first place!
Okay!
thief
Give points!
5
10
15
20
25
15
Name the force that slows things down
Friction
Oops!
Check
Okay!
Check
15
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.
Oops!
Check
Okay!
Check
15
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.
Oops!
Check
Okay!
Check
boom
Lose 50 points!
Oops!
seesaw
Swap points!
Okay!
fairy
Take points!
5
10
15
20
25
thief
Give points!
5
10
15
20
25
trap
No points!
Oops!
gift
Win 10 points!
Okay!
rocket
Go to first place!
Okay!
baam
Lose 25 points!
Oops!
15
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.
Oops!
Check
Okay!
Check
15
Why is frction helpful?
walk, slide on a sheet of ice. brakes use friction to slow down and stop a moving car.
Oops!
Check
Okay!
Check
trap
No points!
Oops!
gold
Win 50 points!
Okay!
fairy
Take points!
5
10
15
20
25
thief
Give points!
5
10
15
20
25
15
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
Oops!
Check
Okay!
Check
15
This is a force that pulls everything to the ground.