Chapter 2 - Kinematics Flashcards

1
Q

What is a scalar quantity?

A

A physical quantity that has only magnitude

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Examples of scalar quantities

A
distance
speed
mass
volume
temperature
energy
density
time
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is a vector quantity?

A

A physical quantity that has both magnitude and direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Examples of vector quantities

A
displacement
velocity
acceleration
weight
force
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Define “speed”

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Define “velocity”

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Calculation of average speed

A

total distance ÷ total time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Calculation of average velocity

A

total displacement ÷ total time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Define “acceleration”

A

The rate of change of velocity at a specific instant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Calculation of average acceleration

A

change of velocity ÷ total time taken

a = (v-u)/t

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

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

A

50 Hz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

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

A

1/f

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Distance-time graph: gradient represents ________

A

speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Displacement-time graph: gradient represents ________

A

velocity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

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

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

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

A

acceleration

displacement (can be positive or negative)

17
Q

What is a free-falling object?

A

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

18
Q

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

19
Q

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

20
Q

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

A

the same time

21
Q

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

22
Q

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

23
Q

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

A

equal

opposite

24
Q

Four equations of motion

A
  1. v = u + at
  2. s = ut + 1/2at^2
  3. v^2 = u^2 + 2as
  4. s = (u + v)/2 t
25
The four equations of motion are only applicable for motion with ________
uniform acceleration
27
Air resistance will ________ when the velocity of a falling object increases
increase
28
When will an object fall with terminal velocity?
At the point when air resistance is equal to the weight of the object (there is no acceleration)
29
Objects with high density have ________ terminal velocity
high
30
Objects with low density have ________ terminal velocity
low
32
In a vacuum, there is no air resistance, so the ________ is constant
acceleration due to gravity