True / False questions related to Newtonian Mechanics

[Sumbhajee]

Homework Statement

These are all true/false questions.

1. The acceleration of an object is same in all inertial reference frames.

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

3. 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.

4. A particle's kinetic energy can change without having any net work done it.

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

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

Homework Equations

The Attempt at a Solution

I have attempted everything I could think of for these true/false questions and I cannot seem to find the correct answer. Please help.

 

[lewando]

If everything you tried is wrong...then the opposite must be true.

Sorry. Paraphrasing George Costanza.

Seriously, what have you specifically attempted? Let's start with that.

 

[nlightner]

1. True - The acceleration of an object is independent of the reference frame in which it is observed, as long as the reference frame is inertial (not accelerating or rotating). This is known as the principle of relativity.
2. False - The work required to lift a mass one meter does not depend on the speed at which it is raised. It only depends on the mass of the object and the acceleration due to gravity.
3. True - This is known as the work-energy theorem and is a fundamental principle in Newtonian mechanics.
4. True - The kinetic energy of a particle can change without having any net work done on it if there are other forms of energy involved, such as thermal energy or chemical energy.
5. False - The amount of power required to lift a box is the same regardless of the speed at which it is lifted. Power is defined as the rate of doing work, so lifting the box quickly would require a higher amount of power.
6. False - Simple machines, such as levers and pulleys, can reduce the amount of work required to do a task by distributing the force needed over a larger distance. This is known as mechanical advantage.