Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Physics > 4. Mechanics > Flashcards

4. Mechanics Flashcards

1
Q

What is a scalar quantity?

A

Has magnitude but no direction.

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

What is the definition of a vector quantity?

A

Both magnitude and direction

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

What is adding two or more vectors called?

A

Finding the resultant of them

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

How do you find the resultant of vectors?

A

Draw a scale drawing (tip to tail). Find the length and angle of the resultant vector.

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

How do you find the resultant when two angles are at right angles to each other?

A

Use pythagoras or trigonometry

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

What does a free body force diagrams show?

A

All forces acting on a single body

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

Is force a vector or scalar quantity?

A

Vector

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

If the body is in equilibrium, what will the forces in each direction be?

A

Balanced

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

If a body is in equilibrium, how is it moving?

A

It is at rest or moving at a constant velocity.

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

When you have 3 coplanar forces acting on a body in equilibrium, what can you draw?

A

A closed loop triangle

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

What is a moment?

A

The turning effect of a force

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

What is the symbol for a moment?

A

M

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

What do you multiply force by to get a moment of a force?

A

Perpendicular distance from the point to the line of action of the force (d).

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

What is the line of action of a force?

A

A line along which it acts

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

What does coplanar mean?

A

Along the same plane (line).

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

What does the principle of moments state?

A

For a body to be in equilibrium, the sum of the clockwise moments about any point equals the sum of the anticlockwise moments about the same point.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is a couple?

A

A pair of forces of equal size which act parallel to each other, but in opposite directions.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the mass of an object?

A

The amount of matter in it.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is inertia?

A

The greater an objects mass, the greater it’s resistance to a change in velocity.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is force measured in?

A

Newton’s (N)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is weight measured in?

A

Newton’s (N)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What is weight?

A

The force experienced by mass due to a gravitational field.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

How do you calculate weight (mg)?

A

Mass x gravitational field strength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What is the gravitational field strength on earth?

A

9.81 m s‐²

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
What is the centre of mass of an object?
The single point that you can consider it's whole weight to act through.
26
Where is the centre of mass on a uniform, regular solid?
At its centre
27
If a vertical line drawn downwards from an objects centre of mass falls outside its base area, what will happen?
The object will topple over
28
What will make an object less stable? (Centre of mass)
A higher center of mass and a wide base area.
29
What is speed?
How fast something is moving.
30
What is the symbol for displacement?
s
31
What is displacement?
How far an objects travelled from it's starting point in a given direction.
32
What is velocity?
The rate of change of displacement.
33
What is acceleration?
The rate of change of velocity.
34
What does a displacement vs time graph look like during acceleration?
A curve
35
What is the gradient of a displacement vs time graph?
Velocity
36
What is the instantaneous velocity/speed?
The speed/velocity of an object at any given point in time.
37
How do you find the instantaneous velocity from a curve on a displacement vs time graph?
Draw a target in that point in time
38
What is a gradient of a velocity time graph?
Acceleration
39
What is uniform acceleration?
The velocity changes by the same amount each second.
40
What is ununiform acceleration?
When the velocity changes by a different amount each second.
41
What is the area under a displacement time graph?
Displacement
42
What is the area under a velocity-time graph?
Displacement
43
Is mass a vector or scalar quantity?
Scalar
44
Is temperature a vector or scalar quantity?
Scalar
45
Is time a vector or scalar quantity?
Scalar
46
Is distance a vector or scalar quantity?
Scalar
47
Is speed a vector or scalar quantity?
Scalar
48
Is energy a vector or scalar quantity?
Scalar
49
Is displacement a vector or scalar quantity?
Vector
50
Is velocity a vector or scalar quantity?
Vector
51
Is force a vector or scalar quantity?
Vector
52
Is acceleration a vector or scalar quantity?
Vector
53
Is momentum a vector or scalar quantity?
Vector
54
What is the area under an acceleration-time graph?
Velocity
55
What is the negative acceleration?
Deceleration
56
What are suvat equations?
Equations of motion
57
What can you use suvat equations to calculate?
-s-displacement -u-initial velocity -v-final velocity -a-acceleration -t-time
58
What is the definition of freefall?
The motion of an object undergoing an acceleration ‘g’.
59
In which direction does ‘g’ act?
Vertically downwards
60
What is the magnitude of ‘g’?
9.81m s^-2
61
What is the only force acting on an object in free fall?
Weight
62
How can objects still have an initial velocity and still undergo free fall?
As long as the force providing the initial velocity is no longer acting.
63
How do all objects fall in free fall?
At the same rate.
64
Why can you use 9.81 as acceleration in a suvat equation?
Because 'g' is a constant acceleration
65
What must you be careful of when using 'g' in suvat equations?
It is a vector so it has positive and negative
66
What is the relationship between horizontal and vertical motion?
None. They are independent of eachother
67
What equations should you use when finding vertical motion?
Suvat
68
What equation should you use for horizontal motion?
Speed=distance/time
69
What is newton's first law?
The velocity of an object will not change unless a resultant force acts on it.
70
What is newton's second law?
Acceleration is directly proportional to the force and inversely proportional to its mass. (F=mxa)
71
What is resultant force?
The vector sum of all the forces.
72
What is acceleration measured in?
m s‐²
73
What is Newtons 3rd law?
If body A exerts a force on body B, then body B exerts an equal but opposite force on object A.
74
What do the forces need to be for newtons 3rd law to apply?
The same type
75
What is friction?
A force that oposes motion

Physics (13 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions