describing motion

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37 Terms

1
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what is speed

distance travelled by an object per unit time

2
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what is average speed

speed calculated from total distance travelled divided by total time take

3
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why can’t we say someone had a steady speed

we find the average which does not account for if they were increasing or decreasing

4
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what is the SI unit for speed

m/s

5
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what is the SI unit for distance

m

6
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what is the SI unit for time

s

7
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what is another common SI unit for speed

km/h

8
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what two things do you usually have to measure to calculate speed

total time taken and distanced travelled between two points

9
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<p>what does this experiment do </p>

what does this experiment do

calculate speed in a laboratory

10
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what is a light gate

allows the speed of an object passing between them to be calculateed electronically

11
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what is an interrupt card

allows the speed an object passing through a light gate to be calculated

12
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what is the rearranged equation for distance

distance = speed * time

13
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what is not the rearranged equation for distance

distance = speed/time

14
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what is the rearranged equation for time

time = distance/speed

15
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what is not the rearranged equation for time

time = distance * speed

16
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<p>what is going on in this graph </p>

what is going on in this graph

object has stopped

17
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<p>what is going on in this graph </p>

what is going on in this graph

constant speed

18
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<p>what is going on in this graph </p>

what is going on in this graph

constant speed returning to start

19
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<p>what is going on in this graph </p>

what is going on in this graph

acceleration

20
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<p>what is going on in this graph </p>

what is going on in this graph

deceleration

21
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<p>what is going on in this graph </p>

what is going on in this graph

constant speed

22
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<p>what is going on in this graph </p>

what is going on in this graph

constant speed

23
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<p>what is going on in this graph </p>

what is going on in this graph

acceleration

24
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<p>what is going on in this graph </p>

what is going on in this graph

deceleration

25
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<p>what is going on in this graph </p>

what is going on in this graph

increasing acceleration

26
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which graph finds distance

speed-time

27
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which graph finds speed

distance-time

28
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how do you find the distance travelled

area under speed-time graph

29
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how do you find speed

gradient of distance-speed graph

30
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what two things do you need when calculating acceleration

time taken and change in velocity

31
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what is the formula for acceleration

acceleration = change in velocity/time taken

32
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what other way is more preferred for calculating acceleration

v-u/delta time

33
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what are the SI units for acceleration

m/s²

34
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how do you read 2m/s²

two metres per second per second

35
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which graph do you use to find acceleration

speed-time graph

36
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how do you find acceleration using a graph

gradient of speed-time graph

37
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on a speed time graph, if the line is straight. What does that mean

changing velocity and no changing distance

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