True or false: (a) If the net or total work done on a particle was not zero, the
ID: 1871852 • Letter: T
Question
True or false: (a) If the net or total work done on a particle was not zero, then its speed must have changed Select (b) If the net or total work done on a particle was not zero, then its veloclty must have changed Select (c) If the net or total work done on a particle was not zero, then its directlon of motlon could not have changed. Select… (d) No work is done by the forces acting on a particle If It remalns at rest. Select (e) A force that is always perpendicular to the velocity of a particle never does work on the particle. Select… eBook 2. +-/4 points Tipler6 6.P.003 My Notes Ask Your Teacher You are riding on a Ferris wheel that is rotating at constant speed. True or false: During any fraction of a revolution, the following occur. (a) None of the forces acting on you does work on you. Select (b) The total work done by all forces acting on you is zero. Select… (c) There ls zero net force on you. Select… (d) You are accelerating. Select… eBookExplanation / Answer
(a) True.
The total work done on a particle is equal to the change in its kinetic energy. Work done is zero implies that there is no change in velocity.
(b)True.
Because, the total work done on the particle changes the kinetic energy of the particle, which means that its velocity must change.
(c) False.
In the case of total work done on the particle is negative, it could be decreasing the particle’s speed and reversing its direction of motion.
(d)True.
Work done is force times the displacement. If its displacement is zero by a net force, the work done is zero.
(e) True.
The directionof moving particle changes when the force perpendiuclar to velocity. However, it does no work on particle.
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2.
(a) False.
Work done on you by both the force exerted by the surface on which you are sitting and the gravitational force acting on you.
(b) True.
Because you are rotating with a constant speed
(c) False.
Because, the net force acting on you is the sum of the gravitational force acting on you and the force exerted by the surface.
(d)True.
Since the direction you are moving is continually changing.
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