Physics help please!


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1. A     35-kg cart (#1) is pulled with a 199-N force for 11 second; another 75 kg cart (#2) is pulled with a 19 N-force for 15 seconds. Which cart (#1 or #2) has the greatest acceleration? Explain.

2.Which cart (#1 or #2) has the greatest impulse? Explain.

3. Which cart (#1 or #2) has the greatest change in momentum? Explain.

Jun 2nd, 2015

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Jun 2nd, 2015

Remember F = ma, so a=F/m. 

Cart 1 has acceleration = F/m = 199/35 = 5.686m/s² 
Cart 2 has acceleration = F/m = 19/75 = 0.253m/s² 
So cart 1 has the bigger acceleration. 

The time is not used. 
___________________________________ 

If you want to work out the final velocities (which is *not* part of the question): 

v = at = (F/m)t, so your formula is correct, 

Cart 1's velocity after 11s = 5.686 x 11 = 62.5m/s 
Cart 2's velocity after 15s = 0.253 x 15 = 3.8m/s 

Don't foget to include units with your values or you lose marks.

Jun 2nd, 2015

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Jun 2nd, 2015
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Jun 2nd, 2015
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