Is the Work-Energy Principle Valid Without Friction?

In summary, the statements involve work, force, motion, and energy. The work done to raise a box onto a platform depends on the time it takes, the work done by a constant force depends on its orientation, work can be done without motion, kinetic energy depends on direction, kinetic energy cannot be negative, and the work-energy principle may not apply if there are frictional forces.
  • #1
evan b
10
0

Homework Statement





Select T-True, F-False, for each statement. If the first is T and the rest F, enter TFFFFF.

A) The work done to raise a box onto a platform depends on how much time it takes to raise it. (Neglect friction, assume it starts on the ground at rest, and ends up resting on the platform)
B) The work done by a constant force acting on an object depends on the orientation of the force relative to the motion of the object
C) Work can be done in the absence of motion.
D) The kinetic energy of an object depends on the direction of the motion involved.
E) The kinetic energy can never be negative.
F) The work-energy principle is not valid if there are frictional forces acting.
 
Physics news on Phys.org
  • #2
evan b said:

Homework Statement



Select T-True, F-False, for each statement. If the first is T and the rest F, enter TFFFFF.

A) The work done to raise a box onto a platform depends on how much time it takes to raise it. (Neglect friction, assume it starts on the ground at rest, and ends up resting on the platform)
B) The work done by a constant force acting on an object depends on the orientation of the force relative to the motion of the object
C) Work can be done in the absence of motion.
D) The kinetic energy of an object depends on the direction of the motion involved.
E) The kinetic energy can never be negative.
F) The work-energy principle is not valid if there are frictional forces acting.

One thing that is definitely true here is that you have to show some effort if you want some help.

So with that in mind, what are your thoughts on the statements?
 
  • #3
i finaly figured it out. it was FTFFTF.
 

FAQ: Is the Work-Energy Principle Valid Without Friction?

What is work?

Work is a physical quantity that measures the amount of force applied to an object over a certain distance. It is calculated by multiplying the force applied by the distance over which it acts.

What is the work-energy principle?

The work-energy principle states that the work done on an object is equal to the change in its kinetic energy. This means that when a force is applied to an object, it either gains or loses energy depending on the direction of the force.

How is work related to energy?

Work and energy are closely related concepts. Work is the measure of the transfer of energy from one object to another, while energy is the ability of an object to do work. In other words, work is a means of transferring energy.

What are the different types of work?

There are three main types of work: mechanical work, electrical work, and thermal work. Mechanical work involves the use of force to move an object, electrical work involves the movement of electric charge, and thermal work involves the transfer of heat.

How is work calculated?

Work is calculated by multiplying the force applied by the distance over which it acts. This can be represented by the equation W = Fd, where W is work, F is force, and d is distance. The unit of work is joules (J).

Similar threads

Back
Top