Basic Forces- Just seeking a simple answer

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Homework Help Overview

The discussion revolves around a physics problem involving forces, specifically the force required to lift a car with a given mass and gravitational field strength. The original poster attempts to calculate the force needed to lift the car at a constant speed.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster calculates the weight of the car and questions whether the force needed to lift it at constant speed implies a net upward force. Some participants seek clarification on whether the object in question is a book or a car.

Discussion Status

Participants are exploring the implications of lifting the car at constant speed and discussing the balance of forces involved. There is a recognition of the original poster's calculation, but also a questioning of the interpretation of net forces in this context.

Contextual Notes

There is some confusion regarding the object being lifted, initially mentioned as a book but later clarified to be a car. The discussion also touches on the principles of Newton's laws and the conditions for balanced forces.

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Homework Statement



Given that the mass of a car is 1000kg, gravitational field strength = 10N/kg

Find the force required to just lift the book up at a constant speed.


The Attempt at a Solution



Constant speed, Accel. = 0

W = mg
= 1000kg * 10N/kg
= 10,000N

Therefore force needed to just lift the book is 10,000N?

However, by the Newton's law, in balanced forces, object at rest will remain at rest... So the car was originally at rest, will it be lifted up by 10,000N?
 
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is it book or car? .. can you please clarify your question..
 
thebigstar25 said:
is it book or car? .. can you please clarify your question..

sorry, its a car
 
your answer is correct .. And regarding your last question, i believe that as long as the car is lifted at constant speed we can not say that there is a net force upward, since if a=0 this implies F=ma=0 N .. What we can say is that we have two forces one upward and the other downward with a value of 10,000N.. When you say it is lifted up with 10,000N it is as you are saying that the net force is 10,000N upward ..

Im not sure whether the other members would agree with my point, but I believe it is that way ..
 

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