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

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SUMMARY

The discussion focuses on calculating the constant force required to stop an 850kg car traveling at 110km/h within a time frame of 10 seconds. The key formula used is derived from impulse-momentum principles, specifically F_{avg}Δt = mΔv. Participants clarify that the question pertains to the force necessary to halt the vehicle rather than external forces like friction or wind. Understanding kinematics and Newton's second law is essential for solving this problem accurately.

PREREQUISITES
  • Understanding of impulse and momentum concepts
  • Familiarity with Newton's second law of motion
  • Basic knowledge of kinematics
  • Ability to perform unit conversions (e.g., km/h to m/s)
NEXT STEPS
  • Study impulse-momentum theorem applications in physics
  • Learn how to apply Newton's second law in real-world scenarios
  • Explore kinematic equations for uniformly accelerated motion
  • Investigate the effects of friction and air resistance on vehicle motion
USEFUL FOR

Students studying physics, automotive engineers, and anyone interested in understanding the dynamics of vehicle stopping forces.

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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F_{avg}\Delta t = m\delta v
 
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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