I was doing a past paper (multiple choice) and it had a question that asked about the impact of constant force on the speed of a car. Since it is constant force, it implies that there is net acceleration, which implies that the speed is constantly changing. Thus, shouldn't the speed-time graph for a net force acting on the car be a concave upwards graph like this? : (see image below)
To my surprise, the correct graph says that the speed is a straight line (y=mx+c) which in my opinion should be a velocity-time graph.
Please help me grasp the concept better
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Annie18451
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- 19-05-2017 08:48
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Kyx
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- 19-05-2017 09:28
(Original post by Annie18451)
I was doing a past paper (multiple choice) and it had a question that asked about the impact of constant force on the speed of a car. Since it is constant force, it implies that there is net acceleration, which implies that the speed is constantly changing. Thus, shouldn't the speed-time graph for a net force acting on the car be a concave upwards graph like this? : (see image below)
To my surprise, the correct graph says that the speed is a straight line (y=mx+c) which in my opinion should be a velocity-time graph.
Please help me grasp the concept better
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Annie18451
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- 19-05-2017 10:12
(Original post by Kyx)
The force is constant, meaning the acceleration is also constant. Acceleration is the gradient on a velocity-time graph meaning the gradient is constant, and hence the graph is a straight line
Posted from TSR MobileI just realised I made a silly mistake. I accidentally took it to be a displacement-time graph instead of a speed-time graph
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Kyx
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- 19-05-2017 10:53
(Original post by Annie18451)
Thanks!I just realised I made a silly mistake. I accidentally took it to be a displacement-time graph instead of a speed-time graph
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