Unit 2: 1 - Motion

Question 0

What is the speed of an object? And how do we find this on a distance time graph?

Answer 0

The speed is the distance the object traveled each second (e.g. 5m/s). The gradient on the distance-time graph is the speed.

Question 1

What axis do distance and time go on on a distance-time graph?

Answer 1

Distance - y

Time - x

Question 2

How do you work out speed?

Answer 2

Distance traveled in metres/Time taken in seconds

Question 3

What is the average speed of a runner who runs 400m in 50s?

Answer 3

8m/s

Question 4

What is velocity?

Answer 4

The velocity is the speed of an object in a given direction

Question 5

What is acceleration?

Answer 5

When the velocity of an object changes

Question 6

How do we calculate acceleration?

Answer 6

a = (v-u)/t
Where a = acceleration (m/s^2 or m/s/s)
v is the final velocity (m/s)
u is the initial velocity (m/s)
t is the time taken for change (s)

Question 7

What is deceleration?

Answer 7

Deceleration is a negative acceleration. For example, if a = -2m/s^2, deceleration = 2m/s^2

Question 8

What is a velocity-time graph?

Answer 8

A velocity-time graph shows the velocity of an object (y) against time taken (x).

Question 9

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

Answer 9

Acceleration. The steeper the gradient, the greater the acceleration.

Question 10

What does it mean when the line is horizontal?

Answer 10

It means there is no acceleration; the object is at a steady speed (0 gradient means 0 acceleration).

Question 11

What does the area underneath the velocity-time graph show?

Answer 11

The distance travelled in a given time.

Question 12

What does an upwardly curving line represent on a distance-time graph?

Answer 12

An increase in speed.

Question 13

What does an upwardly curving line represent on a velocity-time graph?

Answer 13

An increase in acceleration.