Calculating Stopping Force for a 850kg Car at 110km/h | Physics Question

  • Thread starter physicsgrade11
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In summary, the question is asking for the constant force required to bring a car with a mass of 850kg, moving at a constant speed of 110km/h, to a stop in 10.0 seconds. It can be solved using the formula F_{avg}\Delta t = m\delta v or by using kinematics and Newton's 2nd law. The wording of the question may have caused some confusion, as it is asking for the magnitude of the force, not the type of force.
  • #1
physicsgrade11
9
0
ok here is the question exaclty- its worth 5 marks so i don't know what I am missing..

A car with a mass of 850kg is moving in a straight line at a constant speed of 110km/h. It is brought to rest in 10.0s. What constant force is acting to stop the car?
 
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  • #2
[tex]F_{avg}\Delta t = m\delta v[/tex]
 
  • #3
Looks like an impulse question.
 
  • #4
Thanks anyways guys but i got it. I think i was thinking it was asking what force as in friction or wind etc. was stopping it but its asking the force it would take to stop it in that time.
 
  • #5
If you are not familiar with impulse/momentum, you can always use kinematics to find the acceleration, then apply Newton's 2nd law to find the force.
 
  • #6
Good point...I guess they should have said "determine the magnitude of the constant force that brings the car to a stop".
 

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