section 1

Question 1

inertia

Answer 1

the tendency of an object at rest to remain at rest or, if moving, to continue moving at a constant velocity

Question 2

how is inertia related to an object’s mass?

Answer 2

an object whose mass is small has less inertia than an object whose mass is large does

Question 3

what is Newton’s first law?

Answer 3

an object at rest remains at rest and an object in motion maintains its velocity unless it experiences a net force

Question 4

what is Newton’s second law?

Answer 4

the unbalanced force acting on an object equals the object’s mass times its acceleration
F=ma

Question 5

units of force

Answer 5

newtons (N)

Question 6

units of mass

Answer 6

kilograms (kg)

Question 7

units of acceleration

Answer 7

m/s^2 (meters per second squared)

Question 8

weight

Answer 8

measure of the gravitational force exerted on an object

Question 9

free fall

Answer 9

the motion of a body when only the force of gravity is acting on the body

Question 10

terminal velocity

Answer 10

the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity

Question 11

projectile motion

Answer 11

the curved path that an object follows when thrown, launched, or otherwise projected near the surface of Earth
- has 2 components: horizontal and vertical

Question 12

momentum

Answer 12

a quantity defined as the product of the mass and velocity of an object
p=mv
momentum=mass*velocity

Question 13

Newton’s third law

Answer 13

For every action force, there is an equal and opposite reaction force

Question 14

action force

Answer 14

the force exerted on the ball by your foot

Question 15

reaction force

Answer 15

the force exerted on your foot by the ball