Linked Questions

6
votes
5answers
5k views

How can a car's engine move the car?

Newton's First Law of Motion states that an object at rest or uniform motion tends to stay in that state of motion unless an unbalanced, external force acts on it. Say if I were in a car and I push ...
2
votes
4answers
2k views

Newton's Third Law of Motion

I want to start off by saying that I've looked around for other explanations, but I've not really found any satisfying ones. My question is basically the whole "Why can anything move at all?" question,...
0
votes
4answers
8k views

What force enables us to walk?

When we walk, we apply a force $F$ on the earth at an angle $\theta$ . Thus, by Newton's third law, $$ F_{\text{me, earth}}=-F_{\text{earth,me}}$$ Therefore, the earth exerts a reaction force on us, ...
3
votes
4answers
3k views

Work done by the piston versus work done by the surrounding

Suppose a massless, frictionless piston assembly initially has a higher pressure than the external (atmospheric) pressure, and it is pinned so that the piston does not move. Once the pin is removed, ...
2
votes
1answer
1k views

How can I actually push heavier objects?

I've been thinking about Newton's third law lately because I couldn't understand a few things and I think I actually answered my own question. Could someone confirm if my reasoning is right or show me ...
0
votes
1answer
2k views

Does Newton's 3rd law of motion apply when a person is standing still on a ground?

When a person is standing still, the action of the Earth on their body is a gravitational force. What is the reaction force? Is it the person's weight acting on the Earth?
3
votes
1answer
2k views

How muscle force work? [closed]

If muscle works with force on joint and joint works with exact force on muscle(newton III law) how can muscle drag much heavier weight than itself?
0
votes
1answer
1k views

Force exerted by piston in a gas container and work done

If there is container with a moveable piston. If heat is supplied to it the gas in container expands right raising the volume. The gas expands raises the piston against gravity (the gas does positive ...
2
votes
3answers
205 views

How does the Earth bring down a falling object's velocity to zero on contact?

How does the earth bring down a falling object's velocity to zero on contact? If the normal force on an object from a horizontal surface is equal to the weight of the object, the object could never ...
0
votes
1answer
697 views

Action and Reaction - Time lag

Is there a time lag between action and reaction ? If there isn't such a time lag, the reaction force must cancel the applying force although they act on different bodies. My second question is that, ...
3
votes
4answers
232 views

Force (Newton's third law of motion) [duplicate]

When we apply a force, there's always a reaction force too. Why do forces always come in pairs?
0
votes
5answers
100 views

Can force be applied without accelerating?

When I push against a wall, I am applying force on the wall and the wall applies an equal force against mine therefore the wall doesn't move and neither does my hand. But isn't acceleration required ...
0
votes
2answers
741 views

When I pull a rope attached to a block, does the rope OR the block pull me back? If so, with what force?

I am having a hard time understanding the tension force, especially when thinking about it at a molecular level. Suppose I have a rope attached to a block which is sitting on frictionless surface. ...
0
votes
2answers
271 views

Why doesn't limiting friction contradict Newton's Third Law?

$R$ = Normal reaction force exerted on the particle by the ground $Fr$ = Frictional contact force between the particle and the ground All forces are measured in Newtons ($N$) Using the angles we ...
2
votes
3answers
209 views

Information about newton's third law

Well I am still small student of physics, but as far as I know, Newton's Third Law states that, "For every action there is equal and opposite reaction." Now let me tell you how I understood this, ...

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