7.1 Forces and Motion Quiz Study Guide

force

a push or a pull exerted on an object in order to change the motion of the object

static friction

The force that resists the start of sliding motion between two surfaces that are touching

kinetic friction

The force that resists the movement of two surfaces that are touching and are moving relative to each other.

drag

A friction-like force that opposes the motion of an object in a fluid

field

When a force acts at a distance, the area in which an object experiences that force

net force

The combination of all of the forces acting on an object

magnitude

strength of a force

inertia

The tendency of an object to resist a change in motion unless an outside force acts on the object

newton

unit used to express force

Newton's First Law

law of inertia. 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 Second Law

Force = mass x acceleration

Newton's Third Law

Objects Exert a Force on Each Other, Forces in Pairs Have Equal Size but Opposite Directions, Forces Acting in Pairs Can Have Unequal Effects, Forces Can Act in Multiple Pairs

balanced force

a net force of zero

unbalanced forces

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

100 N to the left

What is the net force in the image?

0 N

What is the net force in the image?