course Phy 231
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?
answer/question/discussion:
F = m * a = 12 kg * 3 m/s^2 = 36 kg m/s^2 = 36 Newtons
What would be the acceleration of a 4 kg mass subject to a net force of 20 Newtons?
answer/question/discussion:
F= m * a
20 Newtons = 4 kg * a
a = (20 kg m/s^2) / 4 kg = 5 m/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?
answer/question/discussion:
F = m * a
20 Newtons = 10 kg * a
a = 2 m/s^2
We know there is another force acting on the object, because it should be accelerating at 2 m/s^2 based on the Force and Mass of the object.
What is the total of all those forces and in what direction does this total act?
answer/question/discussion:
The total of all the forces is called the Net Force (Fnet) and in this particular situation there is a total net force of:
F = 10kg * 1.5 m/s^2
F = 15 Newtons
Fnet = 20 Newtons - 15 Newtons = 5 Newtons, in the direction of the force I applied.
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