Distance, Speed and Acceleration Flashcards
What is the equation for speed?
Speed= Distance/ Time
m/s) (m) (s
What is the difference between velocity and speed?
The only difference is that velocity has a direction
What is the equation for velocity?
Velocity= Displacement/ Time
What are scalar measurement?
Measurements that have magnitude (size) only
What are vector measurements?
Measurements that have size and direction
What is the equation for velocity?
Acceleration= change in velocity/time taken
How do you find the speed in a distance-time graph?
You find the distance and divide it by the time
How do you find the mean speed on a distance-time graph?
Average speed=total distance/total time
What is shown on a velocity-time graph?
Acceleration is shown by a straight rising line.
Deceleration is shown by a straight falling line.
Constant speed is shown by a horizontal line.
A horizontal line along the
x-axis shows the speed is zero, meaning that the vehicle has stopped, or is stationary.
How do you find the distance travelled on a velocity-time graph?
You find the area underneath the graph (split up the graph and find the area)
How do you find the average acceleration on a velocity-time graph?
Draw a straight line across the curve, then find the gradient.
Remember gradient=acceleration
What makes up the stopping distance of a vehicle?
Thinking distance+Braking distance
What factors affect thinking distance?
speed distractions, eg mobile phones alcohol drugs tiredness visibility
What factors affect braking distance?
speed worn brakes wet road mass of the car worn tyres icy road
If the speed of a car doubles, how does this affect both the thinking and breaking distance?
The thinking distance doubles
The breaking distance quadruples
