Scalars And Vectors

Question 1

What is the unit for force?

Answer 1

Newton (N)

Question 2

What is the unit for distance?

Answer 2

Metre (m)

Question 3

What is the unit for speed?

Answer 3

Metres per second (m/s)

Question 4

What is the equation for speed?

Answer 4

Speed = Distance ÷ Time

Question 5

How is velocity different from speed?

Answer 5

Velocity includes direction (vector), speed does not (scalar)

Question 6

What is a scalar quantity?

Answer 6

A quantity with magnitude only

Question 7

What is a vector quantity?

Answer 7

A quantity with both magnitude and direction

Question 8

Give examples of scalar quantities

Answer 8

Mass, distance, speed, energy, time, power

Question 9

Give examples of vector quantities

Answer 9

Force, velocity, acceleration, displacement

Question 10

What does displacement mean?

Answer 10

Overall change in position with direction

Question 11

What does distance mean?

Answer 11

How far something moves in total (no direction)

Question 12

What is the difference between distance and displacement?

Answer 12

Distance is total movement (scalar), displacement is overall change in position with direction (vector)

Question 13

What is average speed?

Answer 13

Total distance divided by total time

Question 14

What is instantaneous speed?

Answer 14

Speed at a particular moment (shown on speedometer)

Question 15

Typical walking speed

Answer 15

≈ 1.5 m/s

Question 16

Typical running speed

Answer 16

≈ 3 m/s

Question 17

Typical cycling speed

Answer 17

≈ 6 m/s

Question 18

Speed of sound

Answer 18

330 m/s

Question 19

If distance = 10m and time = 5s, what is speed?

Answer 19

2 m/s

Question 20

If time = 50s and speed = 3m/s, what is distance?

Answer 20

150 m

Question 21

If distance = 80m and speed = 2m/s, what is time?

Answer 21

40 s

Question 22

ISS orbits Earth every 90 minutes. Does its speed change?

Answer 22

No

Question 23

Does the ISS’s velocity change?

Answer 23

Yes, because its direction changes