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; equals the product of mass and velocity.
speed equals 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 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 equals the net force divide by the objects mass.
Newtons third law of motion states that forces always act in equal but opposite pairs.
balanced forces two or more forces whose effects cancel each other out and do not change the motion of an object
Friction force that acts to oppose sliding between two surfaces that are touching.
unbalanced forces two or more forces acting on an object that do not cancel, and cause the object to accelarate.