A push or pull that acts on an object?
force
The force that causes a 1-kilogram mass to accelerate at a rate of meter per second or 1m/s2?
newton
When forces on an object are balanced the net force is what?
zero
When an unbalanced force acts on an object is what?
accelerates
A force that opposes the motion of objects that touch as they move pass eachother?
friction
The four types of friction?
Static, Sliding, Rolling and Fluid
Friction force that acts on objects that are not moving?
Static friction
A force that opposes the direction of motion as it slides over a surface?
Sliding friction
Friction force that acts on a rolling object?
Rolling friction
Opposes the motion of an object through a fluid?
Fluid friction
A force that acts between any two mass?
Gravity
Overall force acting on an object?
net force
Acts in direction opposite to the motion and reduces acceleration?
air resistence
Constant velocity of a falling object when the force of air resistence and gravity balance eachother?
Terminal velocity
Earth's gravity travels where?
Downward toward the center of the earth
What causes objects to accelerate downward?
gravity
the motion of a falling object after it is given initial forward velocity?
projectile motion