# 3.1 Motion Flashcards

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1
Q

How is speed calculated?

A

Distance / time

2
Q

How is velocity calculated?

A

Displacement / time

3
Q

How is acceleration calculated?

A

(v - u) / t

4
Q

How is average speed calculated from a distance-time graph?

A

The gradient of a straight line drawn from the lowest to the highest point of the curve

5
Q

How is instantaneous speed calculated from a distance-time graph?

A

Tangent drawn to the curve at a given point

6
Q

What does the gradient of a displacement-time graph represent?

A

Velocity

7
Q

What is acceleration?

A

The rate of change of velocity

8
Q

What does negative acceleration mean? (2)

A

Slowing down

Acceleration in the opposite direction

9
Q

What does the gradient of a velocity-time graph represent?

A

Acceleration

10
Q

What does the area beneath a velocity-time graph represent?

A

Displacement

11
Q

What is stopping distance? (2)

A

The total distance travelled before stopping

Thinking + braking

12
Q

What is thinking distance? (2)

A

The distance travelled as the driver reacts

Uses s = d/t

13
Q

What is braking distance? (2)

A

The distance travelled whilst braking

Uses suvat

14
Q

What factors affect thinking distance? (5)

A
```Age
Drugs
Visibility
Distractions
Alcohol```
15
Q

What factors affect braking distance? (5)

A
```Brakes
Grip of tyres
Quality of car
Weather
16
Q

What factor affects stopping distance?

A

Speed

17
Q

What is a projectile? (2)

A

An object that only experiences a force due to gravity and experiences no effects from other forces
Its motion can be split into vertical and horizontal components

18
Q

What happens to the horizontal component of velocity as an object free falls?

A

There are no resistive forces so velocity is constant

19
Q

What happens to the vertical component of velocity as an object free falls?

A

The object is only affected by gravity so it has acceleration of 9.81 ms^-2

20
Q

What is parabolic motion?

A

The path traced by an object with just vertical acceleration and constant horizontal velocity

21
Q

What was Aristotle’s view of motion? (2)

A

Natural motion - what an object naturally wants to do

Violent motion - what an object has to be forced to do

22
Q

What was Galileo’s view of motion? (2)

A

He realised that the classic view of motion did not recognise the role of friction in slowing objects down
In the absence of friction, objects will move freely