What will be the change in momentum caused by a net force of 120N acting on an object for 2 seconds?
1 answer:
Answer:
240 Ns
Explanation:
The momentum of an object is the product of its mass and its velocity:
where m is the mass of the object and v its velocity.
According to Newton's second Law of motion, the change in momentum of an object is related to the force applied by it by the equation:
where
F is the force exerted on the object
is the change in momentum
is the time elapsed
In this problem:
F = 120 N is the force exerted on the object
is the time elapsed
Therefore, the change in momentum of the object is:
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Answer:
35 J
Explanation:
The man is holding the box: this means that he is applying a force vertically upward, to balance the weight of the box (which pushes downward).
Therefore, we can ignore the horizontal displacement of the man, because the force applied (vertically upward) is perpendicular to that displacement (horizontal), so the work done for that is zero.
So, only the vertical motion contributes to the work. The work done by the man is equal to the gain in gravitational potential energy of the box, so:
where
is the weight of the box
is the vertical displacement
Substituting, we find