P9

Question 1

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

Answer 1

Speed

Question 2

What are long-distance vehicles fitted with to check that the drivers do not drive for too long?

Answer 2

Tachographs

Question 3

What is the velocity?

Answer 3

Speed in a given direction

Question 4

What is acceleration?

Answer 4

The acceleration is change in velocity of an object per second.

Question 5

How do you calculate acceleration?

Answer 5

Change in velocity divided by time

Question 6

How do you calculate deceleration?

Answer 6

Same as acceleration as answer below zero. (The change in velocity will be negative.)

Question 7

What does the gradient of the line on a velocity time graph represent?

Answer 7

Acceleration

Question 8

What does it mean if the line on a velocity time graph is horizontal?

Answer 8

There is no acceleration

Question 9

Describe the velocity of an object moving round in a circle?

Answer 9

It’s direction of motion changes continuously as it goes round, so its velocity is not constant, even if its speed is constant.

Question 10

What is displacement?

Answer 10

The distance travelled in a given direction.

Question 11

What is the formula for acceleration?

Answer 11

Acceleration (a)= change in velocity (🔺v)
                          Time taken (t)

Question 12

Extended formula for acceleration?

Answer 12

Acceleration=final v -initial v

Time taken

Question 13

What is deceleration?

Answer 13

Used for any situation where an object slows down.

Question 14

What can you use to record how the velocity of an object changes?

Answer 14

A motion sensor linked to a computer.

Question 15

How to find the displacement from a velocity-time graph?

Answer 15

Find the area under the graph.

Question 16

How to find the gradient of a line on a distance-time graph?

Answer 16

You need to draw a triangle under the line. The height of the triangle is the distance travelled and the base is the time taken.

Gradient of a line: the height of the triangle(rise)
———————————————
The base of the traingle (run)

Question 17

What do rise and run represent on a velocity-time graph?

Answer 17

Rise= change in velocity
Tun= time taken

Question 18

V^2 - U^2=2as

Answer 18

S =distance travelled

a= acceleration