On The Move I Flashcards
What are scalar quantities, and give examples?
Scalar quantities (net quantities) are quantities that has magnitude and no direction. E.g. speed, distance, time.
Define velocity:
Velocity is a measure of the change in position
How do you calculate velocity?
Displacement/ time and the direction? Or a negative or plus number
Define displacement:
Change in position with direction
How do you calculate displacement?
Final position – initial position
Define speed:
Rate at which an object moves over a distance
Define average speed:
Equal to the constant speed it needs to travel at to cover a set distance in a set time
How do you calculate average speed?
Distance/ time
How do you calculate instantaneous speed?
Smaller displacement/ shorter time interval
Define instantaneous speed:
The speed of the object at the instant time
Define motion:
Is a change in position measured by distance and time
Distance time graphs
- Its gradient determines the speed of an object
- If the graph is a straight line then the gradient is constant, object is moving at constant speed
- If the graph is curved, then the tangent gives the instantaneous speed of the object at the instant time
Speed- time graphs/ velocity- time graphs
- Slope of a velocity- time graph represents the acceleration of an object
- Distance is equal to the are under a velocity – time graph
- The steeper the graph the greater the acceleration
- Horizontal line means the object is moving at a constant speed
- A downward sloping line means that the object is slowing down
Define distance:
Change in position with no direction
How do you change km h-1 to m s-1 ?
Divide 3.6
