force and motion

# force and motion

Term Definition
acceleration equals the change in velocity divided by the time for the change to take place; occurs when an object speeds up, slows down, or turns
momentum a measure of how difficult it is to stop a moving object; equal the product of mass and velocity
speed equal the distance traveled divided by the time it takes to travel that distance
velocity speed and direction of a moving object
newtons first law of motion states that if the net force acting on an object is zero, the object will remain at rest or move in a straight line with a constant speed
newtons third law of motion states that forces always act in equal but opposite pair
balance forces two or more forces whose effects cancel each other out and do not change the motion of an object
friction forces that act to oppose sliding between two surface that are touching
unbalance forces two or more acting on an object that do not cancel, and cause the object to accelerate
newton second law of motion states that an object acted upon by a net force will accelerate in the direction of the force, and that the acceleration equal the net force divided by the object mass