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### Confusion regarding Newton's Third Law and Conservation of Energy

A specialized system consisting of two bodies A and B. A has 1 J of energy and can thus displace B 1 m by applying a force of 1 N. But at the same time, A also experiences a reaction force and is ...
1 vote
19 views

### Why is the direction of friction not being considered in this problem for calculating the work done?

The solution to the problem happens to be $mg(h+kl)$ because the work done by force $F$ has to be equal to the sum of the work done by friction and gravitational force. But how is the work done by ...
150 views

### Is Energy stored work? [closed]

Energy is the ability to do work therefore Energy should be the primitive form of work. But I cant find any conformation, if wrong can anyone explain to me the relationships between Work, energy, and ...
3k views

### Can there be acceleration without work?

Since $W=Fs$, $F=\frac{W}{s}$. When you substitute this in the formula for acceleration, $a=\frac{F}{m}$, you will get that $a=\frac{W}{ms}$. Then, when work equals zero, acceleration will be zero.
1 vote
88 views

### Is Energy stored Force?

I am currently studying the relationships between energy work and force. I am trying to conceptualize them into one concept of causality. When a force is applied work is done, and energy is ...
1 vote
27 views

### Work done on a body and work done by the body

I want to know that, if we suppose that, if a ball is falling freely then work would be done on the ball by gravity so energy would be given to the ball? and when the ball rebounds after striking the ...
1 vote
119 views

1 vote
25 views

### Aren't the virtual work/virtual power principles in mechanics simply solving for the vector differential equation of motion in a preferred direction?

My conceptual understanding of the virtual work/virtual power principles is that, by hypothesizing "virtual displacements"/"virtual velocities", one can solve the equations of ...
• 165
2k views

### How can a system have kinetic energy if the centre of mass of the system is stationary?

(I'm doing high school physics so please go easy with the crazy calculus) From what I understand, a system has translational kinetic energy if the system of mass is moving at a velocity but the ...
• 181
1 vote
98 views

### A man is rowing a boat upstream is at rest with respect to shore is he doing any work

Is the man doing any work or not when is rowing a boat upstream? I m confused That Okay he's at rest with respect to Shore but at some sites it can be seen that Yes he is doing work then how he is ...