Unit 4 Vocabulary

Front

balanced forces

Back

Equal and opposite forces on an object that result in no change in position, direction, or motion; combined net force equals zero.

Front

net force

Back

the combination of all forces acting on an object

Front

Newton’s First Law of Motion

Back

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless the object is acted upon by an unbalanced force

Front

unbalanced forces

Back

a set of forces exerted on an object that change the motion of the object; the combined force has size and direction; unbalanced forces are needed to make an object start moving, speed up, slow down, or change direction

Front

inertia

Back

the tendency of an object to resist being moved or, if the object is moving, to resist a change in speed or direction

Front

velocity

Back

the speed of an object in a particular direction

Front

Newton’s laws of motion

Back

a series of laws developed by Isaac Newton that describe the relationship between force and motion