P9 Flashcards
(22 cards)
What are the standard units of speed?
Metres per second (m/s)
What are the standard units of distance?
Metres (m)
What are the standard units of time?
Seconds (s)
Write the equation that links: speed, distance and time
SPEED = DISTANCE OVER TIME
What is shown by a horizontal line on a distance-time graPH
Stationary objects
A straight line sloping upwards indicates what on a distance-time graph?
Constant speed
What does the gradient of a distance-time graph show?
Speed of the object
How is gradient calculated?
CHANGE IN Y OVER CHANGE IN X
What is the term given to speed in a given direction?
Velocity
What type of quantity has a magnitude and a direction?
Vector
What type of quanitity has a magnitude only and no direction?
Scalar
What are the standard units for acceleration
m/s2
What term is given the the distance travelled in a given direction?
Displacement
What is the term is used for the change in velocity per second when an object slows down?
Deceleration
What are the standard units for speed?
m/s
What does a horizontal line show on a velocity-time graph?
Zero acceleration
What does a positive gradient on a velocity-time graph represenT
Positive acceleration
What does a negative gradient on a velocity-time graph represent?
Deceleration
What does the velocity of an object travelling in a circle keep changing?
Direction changes
What is shown/calculated using the area underneath a velocity-time graph?
Distance travelled
What do you call a straight line that touches a curve?
Tangent
How can you calculate the speed from a curve
Draw a tangent, calculate the gradien
