Term
| How do you find the distance or displacement from a velocity/time graph? |
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Definition
Find the area under the graph.
Remember: s = area under graph |
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Term
| How do you find the acceleration from a velocity time graph? |
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Definition
Find the gradient of the graph.
Remember: a = v-u
t |
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Term
[image]
Describe the motion from :
1. A-B
2. B-C
3. C-D
4. D-E
5. E-F
6. F-G
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Definition
[image]
1. A-B... constant acceleration
2. B-C... constant speed
3. C-D... constant negative acceleration/deceleration
4. D-E... The car has stopped
5. E-F... constant acceleration in the opposite direction
6. F-G... constant speed in the opposite direction
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Term
[image]
Find the acceleration for motion A |
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Definition
[image]
acceleration = gradient of graph
a = v-u
t
= 20-0
10
= 2 m.s-2
Remember u = 0 (starting speed)
and v =20 (final speed) |
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Term
[image]
Find the acceleration for point C of the journey |
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Definition
[image]
acceleration = gradient of graph
a = v-u
t
= 0-20
40
= -0.5 m.s-2 (negative acc./deceleration)
Remember u = 20 (starting speed)
and v =0 (final speed) |
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Term
[image]
Find the distance travelled
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Definition
[image]
distance = area under graph
Area for part A = 1/2 x 10 x 20 = 100m
Area for part B = 20 x 20 = 400m
Area for part C = 1/2 x 40 x 20 = 400m
distance travelled = 900m
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