speed & acceleration Flashcards
displacement
A
a measure of how far the finishing point is from the starting point. it also states direction
2
Q
vector quantities
A
state both magnitude (size) and direction ( e.g. up, 214 degrees, east, right, etc)
3
Q
scalar quantities
A
state magnitude (size) but no sense of direction. (e.g. mass, temperature, time, distance)
4
Q
average speed formula
A
speed=distance/time
5
Q
symbol and unit for speed/velocity, distance/displacement, time, acceleration
A
speed/velocity: v, m/s
distance/displacement: s, m
time: t, s
acceleration: a, m/s^2
6
Q
how fast is a tractor travelling if it takes 2m30s to cover 3km?
A
20m/s
7
Q
typical speeds
A
walking: 1.5m/s
running: 3.0m/s
cycling: 6.0m/s
8
Q
distance
A
how far an object moves when travelling from one point to another. distance has no indication of direction
9
Q
instantaneous speed
9
Q
instantaneous speed
A
the speed at any one given point
10
Q
acceleration formula
A
acceleration=change in velocity/time taken
a=v-u/t
11
Q
i am walking at 1 m/s and speed up to 5 m/s. if it takes 8 seconds to do so, what is my acceleration?
A
0.5m/s^2
12
Q
how do you find the acceleration on a velocity-time graph?
A
the gradient.
14
Q
how do you find the velocity/speed on a distance-time graph?
A
the gradient
what is acceleration?
A
rate of change in velocity
example of a scalar quantity…
Distance
Speed
