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Phys_Stage 8_Motion Summary
90
MOTION
Speed
Speed is a measurement of how fast something is going.
In science, speed is measured in meters per second (m/s).
Speed
Speed Cameras
Two detector strips are in the road a set distance apart. A timer is started when a car crosses the first strip and stopped when the car crosses the second strip. The speed of the car can then be calculated by a computer. If the car is going faster than the speed limit, the camera will take a photo of the car.
Speed
Cameras
Light Gates
These are invisible beams of infrared light.
One gate is connected to a START terminal, and the other gate is connected to a STOP terminal. A timer is started when a car passes the START light and stopped when they reach the STOP light. Because the light gates are a set distance apart, the speed of the car can be calculated.
Light Gates
Speed
calculations
An easy way to remember speed calculations is to draw a triangle like the one below. This represents your speed equation.
Speed Calculations
Speed is equal to distance divided by time
Equations
Time is equal to distance divided by speed
Distance is equal to speed multiplied by time
Video with calculation examples
Video
Remember your answers should be in meters per second
Patterns of Movement
Changing Speed
If we take photos of a person running while speeding up at a constant time interval, their distance will get further as they keep running faster.
Patterns of Movement
Constant Speed
If we take photos of a person running at a constant time interval and a constant speed, their distance will be constant as well.
Distance/Time
Graphs
Distance vs. Time
The faster the object, the steeper (higher gradient) the graph will be. E.g. The blue car is faster than the orange car.
Any areas where the graph is flat shows there is no movement because there is no change in distance. An incline shows there is movement