P9- Motion

Question 1

How do you find the speed from a distance time graph if the object is accelerating?

Answer 1

Draw a tangent to the curve and find the gradient

Question 2

What is the difference between speed and velocity?

Answer 2

speed is scalar quantity and only has a magnitude
velocity if a vector quantity and has both magnitude and direction

Question 3

What factors can affect the speed at which someone walks, runs or cycles?

Answer 3

age, fitness, terrain, and distance travelled

Question 4

What are the typical speeds for a person walking, running or cycling?

Answer 4

1.5m/s
3.0 m/s
6.0 m/s

Question 5

What are typical speeds of a car and train?

Answer 5

13-30 m/s
50 m/s

Question 6

What is acceleration?

Answer 6

change in velocity of an object per second

Question 7

what is the unit of acceleration?

Answer 7

m/s squared

Question 8

How can an object be accelerating even if it is travelling at a steady speed?

Answer 8

if its changing direction

Question 9

What is happening to an object if it has a negative acceleration?

Answer 9

it is slowing down

Question 10

What information does the gradient of the line in a distance-time graph provide?

Answer 10

speed

Question 11

What information does the gradient of the line in a velocity-time graph provide?

Answer 11

acceleration

Question 12

How can the distance travelled by an object be found from its velocity time graph?

Answer 12

calculate the area under the graph