Motion

Question 1

Equation linking speed, distance and time

Answer 1

average speed = distance travelled ÷ time

Question 2

What can be taken from the gradient of a DISTANCE vs time graph?

Answer 2

The speed

Constant (straight line) gradient means constant speed

Question 3

What measure does the gradient give in a SPEED vs time graph? The area underneath? Gradient of 0 means?

Answer 3

Gradient: magnitude of acceleration
Area under graph: distance travelled
0 gradient: Constant speed, 0 acceleration

Question 4

Unit of acceleration?

Answer 4

m/s/s OR m/s^2 OR ms^-2

Question 5

Define vector quantity and give five examples

Answer 5

Quantities with a size/magnitude AND a direction. Both must be quoted for full marks.
Momentum, acceleration, force, velocity, displacement

Question 6

Equation linking acceleration, velocity and time

Answer 6

acceleration = change in velocity (m/s) ÷ time taken (s)
a = (v – u) ÷ t   [v is final velocity, u is initial velocity]

Question 7

What measure does the gradient give in a DISPLACEMENT vs time graph? What would a constant gradient show? What would a negative gradient show?

Answer 7

Gradient: Velocity
Constant gradient: Constant velocity
-ve gradient: Change in direction

Question 8

What measure does the gradient give in a VELOCITY vs time graph? The area under the graph?

Answer 8

Gradient: acceleration (magnitude and direction)
Area: displacement (distance travelled and direction)