
Newton's Laws of Motion  Questions I.6.2
Questions:
 Define force and state its unit.
 The force of gravity on a wagon is 230 N [down]. The force of friction between the tires and the ground is 10 N [back]. Sheila is pulling the wagon with a force 15 N [forward]. Draw the free body diagram showing the forces on the wagon.
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 Determine if there is a net force:


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Solution:
The object is not accelerating, therefore the = 0.



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Solution:
The object has uniform acceleration, therefore there is a net force.



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Solution:
The object is accelerating, therefore there is a net force.



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Solution:
The object is negatively accelerating, therefore, there is a net force.



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Solution:
All individual forces cancel, therefore, no acceleration and no net force.



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Solution:
The object will be slowing down due to the net force of 3 N.



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Solution:
The object will be accelerating due to the net force of 275 N [forward].

 Given the net force on an object and some individual forces, determine the unknown forces.

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Solution:
A = 16 N [upward]. To have a zero net force A must balance the downward force.


= 54 N [back] 
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Solution:
B = 50 N [down]  must balance upward force.
A = 116 N [back]
= 62 N [forward] + (116 N [forward])
= 54 N [forward]
= 54 N [back]



