Homework SourseFollowing statements are true or False Assume Newtonian Mech
Solution
(a) :
False
A particle\'s kinetic energy can not change without having any net work done on it as
Change in Kinetic Energy = Net Work Done
(b) :
True
Less power is required while slowly lifting a box than while lifting it up quickly.
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.
(c) :
False
The work required to lift a mass one meter does not depend on the speed at which it is raised.
Because the work required depends on how much mass, the local gravitational field, and the elevation change desired
(d) :
True
A simple machine may reduce the force required to do a task
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.
(e) :
True
The acceleration of an object is same in all inertial reference frames.
Because an inertial reference frame is a reference frame which isn\'t accelerating
(f) :
False
The work done by a constant force acting on an object is not equal to the magnitude of the force times the distance the object moves
As the work done by the constant force is given as the cross product of Force and the displacement of the object.
