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

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Homework Help Overview

The problem involves calculating the stopping force required to bring an 850 kg car moving at 110 km/h to rest over a period of 10 seconds. The context is rooted in concepts of impulse and momentum, as well as kinematics and Newton's laws of motion.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the relationship between force, mass, and change in velocity, with some referencing impulse concepts. Others consider the distinction between different types of forces acting on the car, such as friction.

Discussion Status

The discussion has seen participants exploring various interpretations of the problem, with some clarifying the specific nature of the force being asked for. There is acknowledgment of the potential use of impulse or kinematics to approach the problem.

Contextual Notes

Some participants note a lack of clarity in the problem statement regarding the type of force being referenced, leading to different interpretations of the question.

physicsgrade11
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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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[tex]F_{avg}\Delta t = m\delta v[/tex]
 
Looks like an impulse question.
 
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.
 
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.
 
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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