Forces and Motion

a unit of force, abbreviated N (i N= 1kg x m/s^2)

all the forces acting on an object are combined

a force that results and opposes motion when two moving objects touch

friction force that acts on stationary objects, always opposite the direction of the applied force, occurs before movement

force against the direction of motion of an objects that slides on a surface

change in shape at point of contact between an rolling and flat object, friction against a rolling object

force against an object moving in a fluid

fluid friction on object in the air; opposes gravity when an object is falling

an attractive force that pulls two objects toward each other

constant velocity at which gravity and air resistance are balanced; 9.8m/s/s

motion of a falling object after original forward velocity (always a curved path due to initial velocity and gravity)

an object's resistance to change in motion

measure of inertia on an object, dependent on amount of matter in an object

the force of gravity acting upon an object; variable depending on location

answer

if no net force acts on the object, then it's momentum doesn't change

force of electric and magnetic currents

force that holds subatomic particles together

force of gravity that pulls on object to another (weight)

force that causes objects to move in a circle around another object