Unit 7

Question 1

a rate of change of velocity over time?

Answer 1

Acceleration

Question 2

An object is considered to be accelerating when it

Answer 2

speeds up, slows down, or changes direction.

Question 3

when an object speeds
up

Answer 3

positive acceleration

Question 4

when an object slows down

Answer 4

negative acceleration

Question 5

when an object falls under the sole
influence of gravity. On Earth, the rate of free
fall is 9.8 m/s2

Answer 5

free fall

Question 6

A car traveling 35 km/hr accelerates to a speed of 45
km/hr in 0.25 hr. What is its acceleration?

Answer 6

a = 40 km/hr2

Question 7

A jet is traveling at 80 m/s when it starts to approach
a runway. It is able to land and park in 10 s. What is
its acceleration?

Answer 7

a = -8 m/s2

Question 9

1. A car accelerates from a standstill to 60 km/s in 10
   s. What is its acceleration?

Answer 9

Answer: a = 6 km/s2

Question 10

2. A car accelerates from 25 mi/hr to 55 mi/hr in
   0.0083 hr. What is its acceleration?

Answer 10

Answer: a = 3,614.5 mi/hr2

Question 11

3 A runner has a velocity of 11.1 m/s for 9 seconds
until he finishes the race and comes to a stop. What
is his acceleration?

Answer 11

Answer: a = -1.23 m/s2

Question 12

4 A motorcyclist has an acceleration of 5 mi/hr2. If
his initial velocity is 45 mi/hr, what is his final velocity
after 4 hours?

Answer 12

Answer: vf = 65 mi/hr

Question 13

the steepness of a line.

Answer 13

slope