P9 (Motion)

Question 1

Speed

Answer 1

How fast something is going (20m/s)

Question 2

Velocity

Answer 2

Is a speed in a given direction (30m/s north)

Question 3

Explain a car going around a roundabout in terms of speed and velocity

Answer 3

• constant speed

- however it constantly changing velocity

Question 4

Speed (m/s) =

Answer 4

Distance (m) / time (s)

Question 5

Speed of a person walking, running, cycling

Answer 5

• 1 m/s
• 3 m/s
• 6 m/s

Question 6

Speed of a car, train and plane

Answer 6

• 25 m/s
• 55 m/s
• 250 m/s

Question 7

Acceleration (m/s^2) =

Answer 7

Chang velocity (m/s) / time (s)

Question 8

Decceleration

Answer 8

Negative acceleration if something slows down

Question 9

Uniform acceleration

Answer 9

• constant acceleration

- acceleration of object in free fall is roughly 9.8 m/s^2 the same as gravitational field strength

Question 10

Final velocity^2 (m/s) - Initial velocity^2 (m/s) =

Answer 10

2 x acceleration(m/s^2) x distance(m)

Question 11

(Distance and velocity time graph) gradient =

Answer 11

• Speed

- acceleration

Question 12

(Distance and velocity time graph) flat =

Answer 12

• Stationary object

- steady speed

Question 13

(Distance time graph) straight uphill=

Answer 13

• Steady speed

- constant acceleration

Question 14

(Distance time graph) curves =

Answer 14

• steepening means it is accelerating, levelling means it is decelerating
• changing acceleration

Question 15

How do you find the distance of a velocity time graph

Answer 15

Area under the curve