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Motion and Force-1

Motion and Force

TermDefinition
Distance How far an object has moved. Measured in SI units---meters, kilometers, and centimeters
Displacement The distance AND direction of an object's change in position from the starting point. Ex. 20 meters North
Motion A change in position
Speed The distance an object travels per unit of time. Formula speed=distance traveled/time
Velocity the speed of an object and it's motion **A change in velocity can be either a change in how fast something is moving or a change in the direction it is moving Formula change in velocity =final velocity - initial velocity
Acceleration the rate of change of velocity (acceleration also has a direction) **occurs when an object changes its speed, its direction, or both Formula a=v(f)-v(i)/t Acceleration can be positive + OR negative -
Force A push or pull
Net force when two or more forces combined act on an object at the same time
Balanced Forces when two or more forces act on an object and cancel each other out (a net force of zero)
Unbalanced Forces unequal forces acting on an object in opposite directions
Inertia the tendency of an object to resist any change in its motion.
Newton's First Law of Motion If an object is moving at a constant velocity, it keeps moving at a constant velocity unless an unbalanced force acts on it. And if an object is at rest, it stays at rest unless an unbalanced net force acts on it.
Average speed the total distance traveled divided by the total time of travel s=d/t
Instantaneous Speed the speed at a given point in time Ex. the speed shown on the speedometer of a car
Constant speed If an object neither slows down nor speeds up **Usually speed is not constant***
Created by: akley