# Speed Flashcards

1

Q

Average speed Eq.

A

average speed = distance ÷ time

2

Q

Why is average speed used?

A

The speed of the car changes during the journey.

3

Q

How many seconds are in an hour?

A

3600

4

Q

What is the speed of a car at certain points?

A

Instantaneous speed.

5

Q

Distance travelled word equation

A

distance travelled = average speed x time

6

Q

Distance travelled SUVAT equation.

A

s = ^{(u+v)}/2 x t

7

Q

What happens when the speed increases?

A

- The distance travelled in the same time increases.
- The time needed to cover the same distance decreases.

8

Q

What are the axes of a distance time graph.

A

- y = distance
- x = time

9

Q

What is the gradient of a distance-time graph?

A

Speed

A higher speed means a steeper gradient.

10

Q

Lines of a distance-time graph.

A

- A straight line indicates that speed is constant.
- A curved line shows that the speed is changing.