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Answer the following based on Newton's Second Law:
How much net force is required to accelerate a 12 kg mass at 3 m/s^2?
Fnet = 12kg*3m/s^2 = 36N
What would be the acceleration of a 4 kg mass subject to a net force of 20 Newtons?
a= 20N/4kg = 5m/s^2
If you exert a force of 20 Newtons on a 10-kg object and it accelerates in the direction of your force at 1.5 m/s^2, then how do you know there are other forces acting on the object besides your own?
1.5m/s^2 * 10kg = 15N, this is different than the 20N given, that means we have other forces acting upon it.
What is the total of all those forces and in what direction does this total act?
25N in the direction of the force
The acceleration and the force you exert are in the same direction.
A 25 N force and a 20 N force cannot combine to give you a 15-N force which is in the direction of the 20-N force. A 25-N force and a 20-N force in the same direction give you a 45-N net force; if in opposite directions you would get a net force of magnitude 5 N. Neither of these is consistent with the 15-N net force implied by the conditions of this problem.
Can you revise this response?
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20 mins
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