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Force, Mass, and Acceleration Questions

  • Thread starter Kelt
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  • #1
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I have about five questions here that I'm clueless about and need help with.

A. If mass increases and acceleration remains the same, force will _____?
B. If acceleration decreases and mass remains the same, force will _____?
C. If force increases and mass remains the same, acceleration will _____?
D.If force decreases and acceleration remains the same, mass will _____?

I'm not the best at science, and I've tried to give this thought, but I left my notes at school and can't get them until tomorrow (which is when this whole assignment is due.)

I know the answers are in my notes, but I can't access them.

I made an attempt guess at number 1, guessing that force will slow down.
 

Answers and Replies

  • #2
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force = mass * acceleration is all you need for this.
 
  • #3
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What does Newton's Second Law say, that the force is proportional to the mass and acceleration?
 
  • #4
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A. If mass increases and acceleration remains the same, force will _____?
If you don't know just do what the problem says:
Say you start off with a force of 10N, and acceleration of 5m/s/s, and a mass of 2kg.
The problem asks if the mass increases while acceleration is constant, what will happen to the force. So just keep the same acceleration (5m/s/s) and multiply it by a mass that is greater the 2kg, since your mass increased. Did the Net Force get bigger or smaller? You can do this for all of them if you need to.
 
  • #5
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Thanks! That was useful, I think I've got three of the answers now. But not the last one...
 
  • #6
cristo
Staff Emeritus
Science Advisor
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Thanks! That was useful, I think I've got three of the answers now. But not the last one...
Consider the equation f=ma. If you decrease the force, and the acceleration remains constant, what happens to the mass? Try putting some numbers in if you're not sure.
 

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