........................ Is a force that works against motion between object & medium touching.
Friction
15
True or false :Friction can make things slow down or stop.
true
15
Factors affect the friction force . a-type of surfaces b-The weight c-both
c-both
15
which produces greater friction .............. a-Rougher surfaces b-smooth surfaces.
a-Rougher surfaces
15
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
15
Friction is a force that acts in an ___________ direction of movement. a-similar b-opposite
b-opposite
15
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
15
Friction is a ..............................force a-contact b- noncontact
a-contact
15
Is a push or a pull
Force
15
The measuring unit of force is the ........................
newton (N)
15
........................ Is a push or a pull applied by one object to another object that is touching it.
Contact Force
15
A force that pushes or pulls an object without touching it.
non Contact Force
15
magnetism, gravity and electrostatic forces. a-non Contact Force b-Contact Force
