P9 Flashcards
What does the term velocity mean?
The speed and direction you are travelling
Can two object moving at the same speed have a different velocity?
Yes, providing they are moving in a different direction
Is the velocity of an object moving in a circle at a constant speed constant?
No, the direction is constantly changing, this means the object is technically accelerating
What is acceleration?
The change in velocity per second
What is the unit for acceleration?
m/s²
How do you work out the average acceleration of an object?
acceleration = change in velocity ÷ time
What is the actual name of ‘Deceleration?’
negative acceleration
What is negative acceleration
Deceleration is the change of velocity per second when the object slows down
What is the speed equation?
speed = distance travelled / time taken
What is speed measured in?
meters per second
What is distance measured in?
meters
what is time measured in?
seconds
How do you read a distance time graph?
- a stationary object (horizontal line)
- a object moving at a constant speed (straight line sloping upwards)
What is 60 mph in m/s?
27 m/s
What does the gradient represent in a distance time graph?
the gradient of a distance time graph for an object represents the object’s speed.
For an object moving at constant speed, the distance-time graph is a _________ line
Straight
The speed of an object is represented by the ___________ of a line
Gradient
To find the gradient what must you draw under the line
A tangent
The height of the triangle under the line represents the distance travelled, the base represents the _____________
Time taken
What can a motion sensor linked to a computer measure?
Velocity
What is the gradient of the line equation?
Gradient of the line = the height of the tangent / the base of tangent
What does the gradient of a line represent on a velocity time graph?
The acceleration
For a moving object with changing speed the distance time graph is not at a ______ line.
Straight
What is a horizontal line representing on a velocity time graph?
Zero acceleration
What does an upwards gradient on a velocity time graph represent?
Positive acceleration
For a an object moving at a constant acceleration on a velocity time graph what rate does it increase at?
Steady
What does a negative gradient on a velocity time graph represent?
Negative acceleration (deceleration)
What does the gradient represent on a velocity time graph?
Acceleration
What is the equation for acceleration?
Acceleration = change of velocity / time taken
