P9 - Motion (PAPER 2) Flashcards
What is the formula for speed
Speed (m/s) = distance (m) / time (s)
What does the gradient of a line on a distance - time graph represent
The speed
What is the difference between speed and velocity
Speed - only has magnitude
Velocity - speed with a direction
What is the formula for acceleration
Acceleration (m/s^2) = change in velocity (m/s) / time for change (s)
What is the difference between acceleration and deceleration
Acceleration - change of velocity per second when an object speeds up
Deceleration - change of velocity per second when an object slows down
What device can be used to measure velocity change
Motion sensors linked to computers
What does a horizontal line on a distance-time graph show
the object is stationary
What do positive and negative gradients on a velocity-time graph show
Positive - acceleration
Negative - deceleration