Select with of the following statements are True or False: Assumer Newtonian Mec

Question

Select with of the following statements are True or False: Assumer Newtonian Mechanics.

1. A particle's kinetic energy can change without any net work done on it.

2. 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.

3. The work required to lift a mass one meter depends on the speed at which it is raised.

4. A simple machine cannot reduce the work required to do a task.

5. Less power is required while slowly lifting a box than while lifting it up quickly.

6. The speed of an object is the same in all inertial reference frames.

Thank you<3

Explanation / Answer

. 1. A particle's kinetic energy can change without any net work done on it.

False. That would violate conservation of energy.

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The work required to lift a mass one meter depends on the speed at which it is raised.
, FALSE. The work required depends on how much mass, the local gravitational field, and the elevation change desired.

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3. The work required to lift a mass one meter depends on the speed at which it is raised.

technically FALSE. You forgot the cosine of the angle between the vectors term.

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4. A simple machine cannot reduce the work required to do a task.

False.

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5. 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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6. The speed of an object is the same in all inertial reference frames

False.

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