Motion

Question 1

How to calculate distance travelled

Answer 1

Distance travelled = speed (m/s) / time (s)

Question 2

How to calcualte average speed

Answer 2

Average speed (m/s) = total distance (m) / total time (s)

Question 3

What is a vector

Answer 3

A value that has both direction and magnitude

Examples:

• displacement
• velocity
• acceleration
• force
• weight
• momentum

Question 4

What is a scalar

Answer 4

A quantity that has magnitude but no direction

Examples
- speed
- distance
- temperature
- mass
- time

Question 5

What is the difference between distance and displacement

Answer 5

Distance is scalar, meaning it has a magnitude but no direction, but displacement is vector, which means it has both magnitude and direction

Question 6

What is the difference between speed and velocity

Answer 6

Speed is a scalar quantity, meaning that it has no direction but velocity is a vector quantity meaning it has both magnitude and direction

Question 7

You are cycling behind a lorry at 15mph, The lorry is going at 30mph. Find the velocity of the lorry driver relative to you

Answer 7

30-15 =15

= 15mph

Question 8

What is acceleration

Answer 8

The change in velocity per second

Question 9

How to calculate acceleration

Answer 9

Acceleration (m/s^2) = change in velocity (m/s) / time (s)

Question 10

How top calculate acceleration if you know final and initial velocity

Answer 10

Acceleration (m/s^2) = final velocity - initial velocity / time

Question 11

How to calculate speed from a graph

Answer 11

Find the gradient of the line

Speed = change in distance / change in time

Question 12

How are displacement time and distance time graphs different

Answer 12

• on a distance time graph the line can only go up as it only has magnitude and no direction
• on a displacement time graph the line is able to go up and come down as it has both magnitude and direction

Question 13

How to find graph with larger displacement

Answer 13

To find the graph with the larger displacement,you find the area under it.

Question 14

If you measure distance travelled and time,

Answer 14

You can plot a distance time graph
And the gradient will be equal to speed
So then you can plot a speed time graph
And the gradient is equal to acceleration

Question 15

If you measure distance from a starting point and time

Answer 15

You can plot a distance time graph
And the gradient is equal to velocity (speed + direction)
So then You can plot a velocity time graph
And the gradient is equal to acceleration (magnitude) + direction

Question 16

What is an equation of motion

Answer 16

An equation that links velocities, acceleration, distance, and time for objects that have a constant acceleration

Question 17

Equation for motion is

Answer 17

(Final velocity (m/s))^2 - (initial velocity (m/s)^2 = 2 x acceleration (m/s^2) x distance (m)

Question 18

What two factors lead objects to have a higher kinetic energy

Answer 18

• speed
• mass