Speed, Velocity and Acceleration Flashcards
What are the units for mass?
The units for mass are kilograms. Newtons are the units of force.
What is the formula for average speed?
The formula for average speed is distance moved ÷ time taken. Time taken ÷ distance moved does not give us a useful value.
What is the vertical axis in a distance-time graph?
The vertical axis in a distance-time graph is the distance travelled from the start. This often has metres for units but not always.
What does a steep line correspond to in a distance-time graph?
A steep line in a distance-time graph does corresponds to a fast steady speed. The units are often metres per second. Acceleration is shown by a line that curves upwards.
How is velocity different from speed?
Velocity is speed in a given direction
What is the formula for acceleration?
The formula for acceleration is change in velocity ÷ time taken and not time taken ÷ change in velocity
What is the vertical axis in a speed-time graph?
The vertical axis in a speed-time graph is the velocity of the object. This is often, but not always, measured in metres per second.
What does a downwards line correspond to in a speed-time graph?
A downwards line in a speed-time graph corresponds to constant deceleration. This is often measured in metres per second.
What does the area beneath a velocity-time graph represent?
The area below a velocity-time graph represents the distance travelled. This is usually measured in metres.
If a car increases in velocity from +5 m/s to +15 m/s in three seconds, what is its acceleration?
The formula for acceleration is change in velocity ÷ time taken. So 10 m/s divided by 3 s is +3.3 m/s2. You have probably misplaced your decimal point.
