Newton's Laws Test Definitions

Question 0

Mass

Answer 0

The measure of inertia.
Unit: kilograms (1 kg=2.2 lbs)
Symbol: m
SCALAR

Question 1

Inertia

Answer 1

How hard it is to change an object’s motion.

Question 2

Force

Answer 2

A push or a pull.
Unit: Newtons (N)
Symbol: F
VECTOR

Question 3

Weight

Answer 3

The force of gravity on an object.
Unit: N
Symbol: Fg
VECTOR

Question 4

Net Force

Answer 4

EF: Sum of all forces.
Unit: N

Question 5

Equilibrium

Answer 5

Net force=0

Either at rest or moving at a constant velocity.

Question 6

Newton’s first law

Answer 6

An object at rest will stay at rest.

An object in motion will stay in motion (constant velocity) unless an outside NET force acts on it.

Question 7

Remember, there is no normal force when…

Answer 7

the object is not on a surface.

Question 8

If EF=ma, what is the object doing?

Answer 8

constant velocity or at rest.

Question 9

If EF is not equal to zero, what is the object doing?

Answer 9

Accelerating.

Question 10

For elevator problems, the equation is…

Answer 10

EF=ma
fn+fg=ma
YOU DON’T KNOW NORMAL FORCE! THAT’S WHAT YOU’RE TRYING TO FIND!

Question 11

Kinetic friction

Answer 11

the force that opposes motion.