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 I use elastic band, I can change its shape by .....
pulling
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25
Josh loves her garden slide. She finds that when she wears cotton clothes she goes faster than when she wears woollen clothes. Why?
Less friction between slide and cotton clothes than between slide and woolen clothes.
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25
Count the measurement of the forcemeters!
3N, 7N, 5N
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20
Which surface creates the most friction with skateboard? (Grass. Wood, Stone)
Grass
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25
Does this surface smooth or rough? Why?
Smooth! Smooth surfaces have much smaller bumps.
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Check
baam
Lose 20 points!
Oops!
gold
Win 50 points!
Okay!
rocket
Go to first place!
Okay!
lifesaver
Give 25 points!
Oops!
lifesaver
Give 25 points!
Oops!
star
Double points!
Okay!
shark
Other team loses 20 points!
Okay!
thief
Give points!
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25
What are game / sport that you change the direction of a ball?
Cricket, Basketball, football (if you have different answer, your teacher will check your answer)
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boom
Lose 50 points!
Oops!
fairy
Take points!
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25
fairy
Take points!
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thief
Give points!
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15
When most objects with smooth surfaces rub, there is less friction. (True or False)
True
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Check
thief
Give points!
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fairy
Take points!
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gift
Win 20 points!
Okay!
thief
Give points!
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25
Mention some workers who have to change the shape of materials. (three)