Question about interacting objects

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Homework Help Overview

The discussion revolves around a physics problem involving a car and a truck, focusing on the forces exerted between the two vehicles as the car accelerates. The subject area includes concepts of static friction and force interactions in a system of two objects.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the appropriate type of friction to consider, with an emphasis on static friction due to the rolling motion of the tires. Questions about the validity of assumptions made in calculating forces are raised.

Discussion Status

Some participants have provided guidance on the use of static friction and confirmed the correctness of calculated forces. Multiple interpretations of the problem setup are being explored, particularly regarding the assumptions made in the calculations.

Contextual Notes

There is a mention of the conditions under which static friction is applicable, and the problem context includes specific forces exerted by the car's wheels against the ground.

sona1177
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A 1000 kg car pushes a 2000 kg truck that has a dead battery. When the driver steps on the accelerator, the drive wheels of the car push backward against the ground with a force of 4500 N.

A) what is the magnitude of the force of the car on the truck?

B) what is the magnitude of the force of the truck on the car

Before I start, I just want to make sure if I use static friction and not kinetic friction, right since tires are just rolling and not sliding?
 
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Use static friction. It is bad if the wheels slide at start.

ehild
 
I got 3000 N for both by using static friction as the friction component and drawing the force of the wheels as pointing to the right for the Free Diagram of the car. Are these assumptions that I have made valid?
 
sona1177 said:
I got 3000 N for both by using static friction as the friction component and drawing the force of the wheels as pointing to the right for the Free Diagram of the car. Are these assumptions that I have made valid?
Yes and your answers are correct. (It is most likely static friction at work--at least one hopes so. But it really doesn't matter for this problem, since you are told what the force is that the tires exert against the ground.)
 
Great! Thank you so much for taking the time to help me!
 

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