Calc force needed given objects mass & required acceleration

  • #1

Homework Statement


What is the force needed to accelerate a 2.0kg ball at 3.0ms^-2

a) In a frictionless horizontal surface, near the surface of the Earth
b) Vertically upward, near surface of the Earth

Homework Equations


f=ma
w=mg

The Attempt at a Solution


For a) F=2(3) = 6N
By inputing the variables into the formula, I got to an answer. but, I do not know how a) differs from b), as in what route to do for b...

Thank you for any help. :-)
 

Answers and Replies

  • #2
haruspex
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At Earth's surface, what force has to be applied to the object just to keep it where it is?
 

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