Chapter 2 - Kinematics

Question 1

What is a scalar quantity?

Answer 1

A physical quantity that has only magnitude

Question 2

Examples of scalar quantities

Answer 2

distance
speed
mass
volume
temperature
energy
density
time

Question 3

What is a vector quantity?

Answer 3

A physical quantity that has both magnitude and direction

Question 4

Examples of vector quantities

Answer 4

displacement
velocity
acceleration
weight
force

Question 5

Define “speed”

Answer 5

The rate of change of distance of an object at a specific instant

Question 6

Define “velocity”

Answer 6

The rate of change of displacement of an object at a specific instant

Question 7

Calculation of average speed

Answer 7

total distance ÷ total time

Question 8

Calculation of average velocity

Answer 8

total displacement ÷ total time

Question 9

Define “acceleration”

Answer 9

The rate of change of velocity at a specific instant

Question 10

Calculation of average acceleration

Answer 10

change of velocity ÷ total time taken

a = (v-u)/t

Question 11

50 dots per second on a ticker tape timer means frequency (f) = ________

Answer 11

50 Hz

Question 12

The time interval between two dots (1 dot interval) = ________

Answer 12

1/f

Question 13

Distance-time graph: gradient represents ________

Answer 13

speed

Question 14

Displacement-time graph: gradient represents ________

Answer 14

velocity

Question 15

Speed-time graph: gradient represents ________ and area under graph represents ________

Answer 15

acceleration (if motion in a straight line in one direction) or only magnitude of acceleration (otherwise)
distance (only positive)

Question 16

Velocity-time graph: gradient represents ________ and area under graph represents ________

Answer 16

acceleration

displacement (can be positive or negative)

Question 17

What is a free-falling object?

Answer 17

An object that falls under the sole influence of gravity (without air resistance)

Question 18

All objects in free fall near the surface of Earth experience an acceleration of ________

Answer 18

10ms^-2

Question 19

When there is no air resistance, all objects, regardless of their mass or size, will fall at the same rate
True or False?

Answer 19

True

Question 20

When there is no air resistance, any two objects, when released from the same height, will reach the ground at ________

Answer 20

the same time

Question 21

If an object is dropped from a height, then its initial velocity (u) is ________

Answer 21

0ms^-2

Question 22

If an object is projected upwards in an perfectly vertical direction, its velocity is ________ at the highest point of its motion

Answer 22

0ms^-2

Question 23

If an object is projected upwards in an perfectly vertical direction, the velocity at which it is projected is ________ in magnitude and ________ in direction to the velocity that it has when it returns to the same height

Answer 23

equal

opposite

Question 24

Four equations of motion

Answer 24

1. v = u + at
2. s = ut + 1/2at^2
3. v^2 = u^2 + 2as
4. s = (u + v)/2 t

Question 25

The four equations of motion are only applicable for motion with ________

Answer 25

uniform acceleration

Question 27

Air resistance will ________ when the velocity of a falling object increases

Answer 27

increase

Question 28

When will an object fall with terminal velocity?

Answer 28

At the point when air resistance is equal to the weight of the object (there is no acceleration)

Question 29

Objects with high density have ________ terminal velocity

Answer 29

high

Question 30

Objects with low density have ________ terminal velocity

Answer 30

low

Question 32

In a vacuum, there is no air resistance, so the ________ is constant

Answer 32

acceleration due to gravity