P9 - Motion (PAPER 2)

Question 1

What is the formula for speed

Answer 1

Speed (m/s) = distance (m) / time (s)

Question 2

What does the gradient of a line on a distance - time graph represent

Answer 2

The speed

Question 3

What is the difference between speed and velocity

Answer 3

Speed - only has magnitude

Velocity - speed with a direction

Question 4

What is the formula for acceleration

Answer 4

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

Question 5

What is the difference between acceleration and deceleration

Answer 5

Acceleration - change of velocity per second when an object speeds up
Deceleration - change of velocity per second when an object slows down

Question 6

What device can be used to measure velocity change

Answer 6

Motion sensors linked to computers

Question 7

What does a horizontal line on a distance-time graph show

Answer 7

the object is stationary

Question 8

What do positive and negative gradients on a velocity-time graph show

Answer 8

Positive - acceleration

Negative - deceleration