p9 - motion Flashcards
define speed
- measure of how quickly distance changes
- measured in (m/s)
- scalar quantity
define velocity
- measure of how quickly distance changes but includes direction of movement
- measured in (m/s)
- vector quantity
define gradient
- slope
- found by dividing change in y by the change in x
define acceleration
- rate of change in velocity
- speeding up
give acceleration of objects in freefall near Earth’s surface
objects in freefall near earth’s surface have an acceleration of 10 m/s squared
define deceleration
- negative acceleration
- slowing down
give an equation for distance
s = v t
distance (m) = velocity (m/s) x time (s)
give an equation for acceleration
a = △v / t
acceleration = change in velocity (m/s²) / time (s)
give an equation including final velocity and initial velocity
v² - u² = 2 a s
final velocity² - initial velocity² = 2 x acceleration x distance travelled
give the typical walking speed
1.5 m/s
give the typical running speed
3 m/s
give the typical cycling speed
6 m/s
what does a slope mean in a distance time graph?
an object is moving at a constant rate
what does a horizontal line mean in a distance time graph?
an object is not moving
what does gradient tell you in a distance time graph?
the speed of an object
