An object is being lifted on a cord at a speed, which is increasing. There are t

Question

An object is being lifted on a cord at a speed, which is increasing. There are two forces on the object, the weight (of magnitude mg) and the tension in the cord (of magnitude T)

A) What is the direction of the acceleration?

UP         DOWN             A=0

EXPLAIN YOUR REASONING

B) How does the tension compare to the weight?

T=mg        T>mg         T<mg

EXPLAIN YOUR REASONING

An object is being lifted on a cord at a speed, which is increasing. There are two forces on the object, the weight (of magnitude mg) and the tension in the cord (of magnitude T)

Explanation / Answer

a)

UP

Because the speed increases in the upward directoion

b)

T > mg

Because the direction of the net force must be in the acceleration direction, upward. So

F_net > 0

==> T - m g > 0

==> T > mg

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