Contact Forces Goal D Vocabulary

Definition: speeding up, slowing down, or changing direction

• distance

• velocity

• displacement

• acceleration

Definition: The tendency of an object to resist a change in motion

• acceleration

• gravity

• velocity

• inertia

Definition: Forces that produce a nonzero net force, which changes an object's motion

• unbalanced forces

• any combination of forces

• balanced force

• action forces

Definition: 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 acted upon by an unbalanced force.

• Newton's First Law of Motion

• Newton's Second Law of Motion

• Newton's Fourth Law of Motion

• Newton's Third Law of Motion

Definition: The rate of change of position in which the same distance is traveled each second.

• constant speed

• changing speed

• average speed

• Instantaneous speed

Definition: Equal forces acting on an object in opposite directions.

• gravitational force

• balanced force

• centripetal force

• friction force