Ch 2 Kinematics#

Question 1

Define speed.

Answer 1

The rate of change of distance.

Question 2

Define velocity.

Answer 2

The rate of change of displacement.

Question 3

Formula of average speed

Answer 3

average speed = total distance / total time

Relationship between v, d and t

v refers to both speed and velocity.

Question 4

Formula of average velocity

Answer 4

average velocity = total displacement / total time

Relationship between v, d and t

v refers to both speed and velocity.

Question 5

Define acceleration.

Answer 5

The rate of change of velocity.

Question 6

Formula of acceleration

Answer 6

Question 7

What physical quantity does the gradient of a speed-time graph give?

Answer 7

acceleration

Question 8

What physical quantity does the gradient of a distance-time graph give?

Answer 8

speed

Question 9

What physical quanity does the area under a speed-time graph give?

Answer 9

distance moved by object

Area under the graph can be of different shapes.
You just need to use the correct formula for the different shapes.

Question 10

What is the value of the acceleration due to free fall on Earth? (include units)

Answer 10

10 m/s²

This is also the value for g, acceleration due to gravity on Earth.

Question 11

How is acceleration related to deceleration?

Answer 11

a = -d

e.g. if acceleration is -3 m/s^2,
then deceleration is 3 m/s^2.

Question 12

Describe the motion of the object in this speed-time graph.

Answer 12

object is moving with constant acceleration

Question 13

Describe the motion of the object in this speed-time graph.

Answer 13

object is moving with decreasing acceleration

Question 14

Describe the motion of the object in this speed-time graph.

Answer 14

object is moving with increasing acceleration

Question 15

Describe the motion of the object in this speed-time graph.

Answer 15

object is moving with constant deceleration

Question 16

Describe the motion of the object in this speed-time graph.

Answer 16

object is moving with constant velocity

Question 17

Describe the motion of the object in this speed-time graph.

Answer 17

object is moving with decreasing deceleration

Question 18

Describe the motion of of the object in this distance-time graph.

Answer 18

object is not moving /
object’s speed is zero

Question 19

Describe the motion of the object in this distance-time graph.

Answer 19

object moving at constant speed

Question 20

Describe the motion of the object in this distance-time graph.

Answer 20

object decelerates

You cannot tell if the deceleration is constant, increasing or decreasing from this graph

Question 21

Describe the motion of the object in this distance-time graph.

Answer 21

object accelerates

You cannot tell if the acceleration is constant, increasing or decreasing from this graph