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Friction is a force that acts in an ___________ direction of movement.
opposite
Mention 2 advantages of friction.
Any 2: allows objects to remain still, allows us to grip things and walk, prevents slipping, allows moving objects to stop, produces heat to start a fire.
What is a force?
A push or pull applied to an object.
Which ball has more friction? The top ball or the bottom ball?
Top ball
Is friction useful for doing ice skating?
No
Who will go faster? A or B?
A. Because it has less friction.
True or False: Friction speeds up moving objects.
False (Friction slows things down)
True or False: Heavier objects require more force to move and stop.
True
Andy is kicking a moving soccer ball. What is the effect of forces on the ball?
Forces can change the direction of the ball
Which type of force shown in the picture?
A pull
Which type of force shown in the picture?
A push
Mention two disadvantages of friction.
Friction causes wear and tear. Friction produces heat that can damage machine.
Bea is squeezing her red ball. What is the effect of force shown in this movement?
Force can change the size and shape of an object.
What is the unit measurement of forces?
newton (N)
What is the instrument / tool used to measure force?
Forcemeter
What causes friction?
Friction is caused when the surfaces of two objects are in contact.
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