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Friction Force
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magnetism, gravity and electrostatic forces. a-non Contact Force b-Contact Force
a-non Contact Force
A force that pushes or pulls an object without touching it.
non Contact Force
........................ Is a push or a pull applied by one object to another object that is touching it.
Contact Force
The measuring unit of force is the ........................
newton (N)
Is a push or a pull
Force
Friction is a ..............................force a-contact b- noncontact
a-contact
A type of friction that occurs when air pushes against a moving object causing it to negatively accelerate surface area a-air resistance b-decreasing velocity c-gravity
a-air resistance
Friction is a force that acts in an ___________ direction of movement. a-similar b-opposite
b-opposite
1. Which of the following is an example of friction that is helpful? a-Brakes used on a bike b-Tires from a car on the road c-Tread on the bottom of your shoes d-All are examples that are helpful
d-All are examples that are helpful
which produces greater friction ..............   a-Rougher surfaces     b-smooth surfaces.
a-Rougher surfaces
Factors affect the friction force .     a-type of surfaces     b-The weight      c-both
c-both
True or false :Friction can make things slow down or stop.
true
........................ Is a force that works against motion between object & medium touching.
Friction
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