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# Physics help please watch

1. Could someone help me answer these q's please
1) A small car has a mass of 1000kg and takes 0.05s to stop. Calculate the force on it when it stops from a speed of a) 15m/s b) 30m/a
2. F=m(v-u) / t

a) F = 1000(15-0) / 0.05 = 300000N

b) F = 1000(30-0) / 0.05 = 600000N

3. (Original post by Mo H)
F=m(v-u) / t

a) F = 1000(15-0) / 0.05 = 300000N

b) F = 1000(30-0) / 0.05 = 600000N

Thanks )
Can you help me with more please ?
4. 2) how do your answers to q1 relate to each other? Is there a relationship between speed and force?

3) compare the effects of mass in the same way. Use a speed of 15m/s and the same stopping time and compare a 1000 kg car with a 2000kg car.

4) how does the force on a 1000kg car travelling at 15m/s change if it has a longer crumple zone and takes 0.1s to stop?
(Original post by Girlsaredope)
Thanks )
Can you help me with more please ?
5. 2) There is a relationship between change in speed and force. The greater the change in speed per unit time, the greater the force needed.
3) Mass has a similar effect. Try working it out using the equation for different masses.
4) A longer stopping time means that the force will decrease. Ft = m(v-u) so if t increases, F must decrease.

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Updated: January 26, 2017
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