5 questions
It push and pull in an object is called ____
force
motion
energy
pressure
What increases friction?
more speed
rough surface
smooth surface
more surface area
A ball in the ground slows down and finally stops, this is beacause of ___
friction
force
motion
less force applied
The rubbing of the object on the surface against another is _____
electrical force
frictional force
magnetic force
gravitational force
The following can reduce friction, EXCEPT
grease
oil
sand
water