200 disc 07: rotation, torque, and angular moment um (2) Revolving door goal: co

Question

200 disc 07: rotation, torque, and angular moment um (2) Revolving door goal: consider forces and torques revolving door consists of four panels which rotate about a common axis of rotation. e drawings below are top views of the revolving door; the arrows represent people pushing on the panels. We will assume that each of them pushes with the same amount of force, say Th 100 N. Under each drawing, say whether you expect the revolving door to rotate clockwise, counterclockwise, or to not rotate at all. Also state whether the net force on the door is to the left, right, or zero. Is it always true that an object with zero net force means that there is no rotational effect? If not, give a counterexample. ls it always true that no rotational effect means that the net force is zero on the object? If not, give a counterexample.

Explanation / Answer

a)

in daigram (a) net force is zero

in daigram (b) net force is zero

in daigram (c) net force is zero but action of the force is not zero,

hence, there is a rotational effect in figure (c)

door will move inn counter clock wise direction

b)

"an object with zero net foce means there is no rotational effect"

the above statement is not true

in the above figure(c) net force is zero but net Torque is not zero

c)

"no rotational effect means the net force is zero"

the above statement is true,

here, net force is zero and net torque acting on the body is also zero

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