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Newtonian mechanics discusses the movement of classical bodies under the influence of forces by applying Newton’s three laws. For more general concepts, use [classical-mechanics]. For Newton’s description of gravity, use [newtonian-gravity].

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How to calculate friction on body in downwards-facing tube? [closed]

Imagine a falling body, that is in a tube. The tube and body may have a frictional coefficient $\mu$. Generally the frictional force would be given by $\mu R$, where $R$ is the normal reaction. But in …
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-1 votes

Finding the final velocity of a car after 8 seconds with energy

Power is simply energy/time. Since 75% energy is converted to kinetic energy: $$ E = 150000W \times 8s \times 75/100 = 900000J $$ The formula for Kinetic energy is $1/2mv^2$. So equating the two expre …
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Can kinetic friction and static friction be independent of each other in rigid body motion?

Static friction exists only when a body is at rest relative to the surface. Kinetic friction exists only when a body is moving relative to the surface. If a body is in motion then it will have only ki …
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1 vote

Two rockets, A and B, are initially close together and on the same axis but facing in opposi...

The law of conservation of momentum would apply here, as you would have guessed. So the initial momentum of the eject will be equal to the final momentum of fuel and rocket combined. That mass will be …
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5 votes

Is there an intuitive way to view the concept of momentum?

Imagine two large iron rolling balls, one larger than the other. Imagine they are moving at the same speed. Imagine trying and stopping them. Which would be easier? The lighter one, of course. And if …
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0 votes

Parallel Axis Theorem Derivation

The centre of mass is defined such that the sum of mass moments about it is zero. Recall how the CoM was defined: $$ M\vec{r}_{cm} = \sum_{all}m_i\vec{r}_i $$ M can be written as $\sum_{all}m_i$. The …
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0 votes
4 answers
164 views

Why does body with continuous speed generate force?

So... sorry if the question seems a bit stupid, but it's been nagging me all day and I couldn't find an answer on the net. It goes like this: If a body, say, a car is moving with constant speed. This …
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1 vote

In which direction should the momentum be conserved in case of colliding objects?

Short answer: It is conserved in all directions. Long answer: The final momentum is determined by the sum of the momenta of the different objects. You have to understand that momentum has components, …
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