Exploring Newton's Third Law: Rope with a Wheel & Work/Potential Energy

In summary, the conversation includes a question about Newton's third law involving a rope with a wheel. There are also two questions related to work, one about the continuous application of force and the other about the effect of a 100N force on a weight being lifted by a man.
  • #1
primarygun
233
0
One question related to Newton's third law,
v
t p
u o
u o
It is a rope with a wheel,v.
If 50N is applied from u pulling towards the ground, what's the reaction force?
From o to p ?

Two questions related to work,
I think the force in the equation of work done is continuously applied,like weight, right?
And the object would not stop finally, right?

For the PE, a weight of 100N is lifted up by a man up to a height of 10m.
Why the force applied by the man continuously is 100N?
Isn't 100 N causing no effect on the weight as it is compensated by the mg of the weight, right?
 
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  • #2
"One question related to Newton's third law,
v
t p
u o
u o
It is a rope with a wheel,v.
"
What does this mean?
 
  • #3
:confused: :confused:
 
  • #4
How about these?
Two questions related to work,
I think the force in the equation of work done is continuously applied,like weight, right?
And the object would not stop finally, right?

For the PE, a weight of 100N is lifted up by a man up to a height of 10m.
Why the force applied by the man continuously is 100N?
Isn't 100 N causing no effect on the weight as it is compensated by the mg of the weight, right?
 

What is Newton's Third Law?

Newton's Third Law states that for every action, there is an equal and opposite reaction. This means that when one object exerts a force on another object, the second object will exert an equal and opposite force back on the first object.

How does a rope with a wheel demonstrate Newton's Third Law?

A rope with a wheel is a simple machine that can help demonstrate Newton's Third Law. When one end of the rope is pulled, the wheel turns and the rope on the other end pulls back with an equal and opposite force. This is an example of action and reaction forces.

What is work and potential energy?

Work is a measure of the energy transferred when a force is applied to an object and the object moves in the direction of the force. Potential energy is the energy that an object has due to its position or state, and can be converted into other forms of energy, such as kinetic energy.

How does Newton's Third Law relate to work and potential energy?

When an object exerts a force on another object, the second object will also exert an equal and opposite force back on the first object. This means that when work is done on an object, an equal amount of work is also done by the object. Similarly, potential energy can also be transferred between objects through action and reaction forces.

How can we use a rope with a wheel to demonstrate work and potential energy?

By pulling on one end of the rope, we are exerting a force on the wheel, causing it to turn and do work. This work is then transferred to the other end of the rope, which pulls back with an equal and opposite force. This demonstrates the transfer of potential energy into work, as well as the equal and opposite forces involved in Newton's Third Law.

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