Forces Flashcards

1
Q

What is acceleration?

A

Rate of change in velocity

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

Is acceleration a vector or scalar quantity?

A

Vector quantity. This means it has magnitude and direction

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

What do distance-time graphs tell us?

A

How far something has travelled in how much time

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

What does the gradient of a line on a distance-time graph tell us?

A

Speed of the object

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

What does a straight line indicate on a distance time graph?

A

The speed is constant

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

What does a flat line indicate on a distance time graph?

A

Object is stationary

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

What does a curved line upwards indicate on a distance time graph?

A

Speed is increasing/ acceleration

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

What does a curved line downards indicate on a distance time graph?

A

Speed is decreasing/ decelaration

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

How do you find speed of a curve?

A

Draw a tangent, then find speed of the tangent

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

What is the formula for gradient?

A

Change in distance/change in time

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

Where is distance in distance-time graphs?

A

On the Y axis

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

Where is time in distance-time graphs?

A

X axis

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

What do velocity time graphs show us?

A

How an object’s velocity changes over time

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

Where is velocity in the graph?

A

Y axis

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

Where is time in velocity-time graph

A

X axis

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

What is the formula for gradient?

A

Change in velocity/change in time

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

What does the gradient show us in a velocity-time graph?

A

Tells us about an object’s acceleration

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

What does a constant positive gradient tell us?

A

Constant acceleration

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

What does a constant negative gradient tell us?

A

Constant decelaration

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

What does a flat line tell us?

A

Velocity is constant

21
Q

Steep curve

A

Rate of acceleration is increasing

22
Q

How do we find distance travelled in a velocity-time graph?

A

We find the area under the line

23
Q

What is a force

A

A force is a push, pull or a twist.

24
Q

What is force measured in?

A

Newtons (N)

25
Are forces vector or scalar?
Forces are vector
26
What are the 2 groups of forces?
Contact and non-contact forces
27
What are contact forces?
Contact forces are those where the 2 objects are physically touching
28
What are non-contact forces?
Forces where objects do not have to be physically touching
29
What is Newton's first law?
A resultant force is required to change the motion of an object
30
What is Newton's second law?
Any non-zero resultant force acts on an object, then it will cause the object to accelerate
31
What is thinking distance?
The distance a car travels while the driver is reacting to an incident
32
What is braking distance?
The distance car travels while brakes are applied
33
What are some factors that affect braking distance?
Speed of vehicle Road conditions Weight of vehicle Tire condition Efficiency of braking system
34
What are some factors affecting thinking distance?
Human Variation External influence Driver fatigue Distractions Visual impairments Car's speed
35
What is terminal velocity?
When the object doesn't accelerate any further. Terminal velocity is the maximum speed attainable by an object
36
What are the forces on an object that is at constant velocity?
They are balanced
37
What is the formula for pressure?
Pressure = Force/Area
38
What is pressure measured in?
Pascals
39
What are the units of pascal?
N/M^2
40
What are some applications of objects with high pressure?
Knifes, scissors and saws all need to have high pressure to easily cut through objects
41
What are some applications of objects with low pressure?
Skis, tires, feet of big animals and seat belts need to have low pressure so that we can have stability, comfort and safety.
42
What are two fundamentals about pressure in fluids?
a. Pressure increases with depth b. Pressure acts equally in all directions
43
What is the point that an object rotates around called?
The pivot
44
What is the rotational effect of a force called?
It is called the moment
45
How do we calculate moments?
Moment = force x distance to pivot
46
What are moments measured in?
Nm or Ncm
47
What are the 2 directions a moment can cause an object to move in?
Clockwise and anti-clockwise
48
Clockwise moments =
Anti clockwise moments