Select which of the following statements are True or False. Assume Newtonian Mec
ID: 3894090 • Letter: S
Question
Select which of the following statements are True or False. Assume Newtonian Mechanics.
TrueFalse A simple machine may reduce the force required to do a task.
TrueFalse Less power is required while lifting a box up quickly than while slowly lifting it.
TrueFalse The acceleration of an object is same in all inertial reference frames.
TrueFalse The work done by a constant force acting on an object is equal to the magnitude of the force times the distance the object moves.
TrueFalse The work required to lift a mass one meter depends on the speed at which it is raised..
TrueFalse A particle's kinetic energy can change without having any net work done it.
It is not TTFTFF, TFFFFF, FTTTFF
Explanation / Answer
A simple machine may reduce the force required to do a task.
True. Simple machines enable trade of force and distance. At the input of a simple machine, a small force is required and at the output, a large force is delivered. We pay for this, because at the input, a large distance of application of the force is required, and at the output, only a little distance is delivered.
It could be made false, if you design a simple machine for a different purpose. If you design a simple machine like overdrive gearing of a large gear driving a small gear, the input is a large force through a small distance, and the output is a small force applied through a large distance. Such a simple machine still is useful, it just isn't the majority of simple machines.
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Less power is required while slowly lifting a box than while lifting it up quickly.
True. Power is the rate at which energy is converted. We pay for lifting it slowly, because it requires more time. If our goal is to lift the box a desired distance on Earth, the work (energy) required is still the same, but the rate at which the energy is used depends on how quickly we desire to accomplish the task.
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The acceleration of an object is same in all inertial reference frames.
True. An inertial reference frame is a reference frame which isn't accelerating.
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The work done by a constant force acting on an object is equal to the magnitude of the force times the distance the object moves.
FALSE.
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The work required to lift a mass one meter depends on the speed at which it is raised.
Neglecting non-ideal effects, FALSE. The work required depends on how much mass, the local gravitational field, and the elevation change desired.
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A particle's kinetic energy can change without having any net work done it.
False. That would violate conservation of energy.
so answer is TTTFFF
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