Tagged Questions
1
vote
4answers
126 views
Is it possible to whirl a point mass (attacted to a string) around in a horizontal circular motion *above* my hand?
I'm studying circular motion and centripetal force in college currently and there is a very simple question but confuses me (our teacher doesn't know how to explain either :/), so I hope we can sort ...
0
votes
0answers
46 views
What force does the seat exert on the rider at the top and bottom of the ride? [closed]
A 75 kg person rides a Ferris wheel which is rotating uniformly. The centripetal force acting on the person is 45 N. What force does the seat exert on the rider at the top and the bottom of the ride?
0
votes
1answer
64 views
Centripetal force and circular motion
I have a doubt, say when a body moves in a circular loop, there are basically two types of acceleration acting on the object. One is the linear acceleration which is basically tangent to the circle, ...
0
votes
1answer
66 views
Change in speed of a satellite
Suppose there's some satellite orbiting the earth in circular motion. Suppose there's an asteroid that hits the satellite in the same direction as the instant velocity vector of the satellite. The ...
4
votes
0answers
138 views
Friction in circular motion [closed]
A circular horizontal table spins around its axis of rotation with a constant angular speed. It completes one revolution in 2 seconds. An object whose mass is $M = 0.8 \ \text{kg}$ is placed on the ...
0
votes
1answer
226 views
Physics of Banked Curves at an angle [closed]
When calculating the normal force of an object on a ramp inclined at an angle,
the force of gravity is broken into components: $f_{gx}$ and $f_{gy}$, where $f_{gx} = f_g \sin (\theta)$ and $f_{gy} = ...
0
votes
1answer
125 views
Vertical Loop like Anti-gravity
Let's take a bottle (no cap) with half its volume filled with water. If we rotate the bottle at some slower average velocity, water does not drop out of it. The same principle works on Roller ...
0
votes
1answer
197 views
Is my understanding of the mechanics of skidding correct?
I'm trying to understand the mechanics which determine if a car making a turn will skid.
Are the following correct or incorrect:
A vehicle making a turn will skid unless the centripetal force is ...
2
votes
1answer
190 views
When does centripetal force cause constant circular motion?
As far as I know, if an object has a speed $s$ and a force is applied to it which generates an acceleration of $s^2/r$, then the object will start moving in a circle of radius $r$. Also, as far as I ...
2
votes
1answer
350 views
Circular Motion Equation Derivation
I am given a series of three equations, which someone has used to determine the Tension force in a rope swing:
$$mgh=1/2mv^2$$
$$T-mg=\frac{mv^2}{r}$$
$$T=3mg=1764N$$
I am asked to exaplain the steps ...
0
votes
2answers
893 views
Circular motion period equation
The equation,
$$ a_c=\frac{4\pi^2r}{T^2} $$
Can be expressed as:
$$ F_c=\frac{m4\pi^2r}{T^2} $$
I am confused as to how to arrive at this second equation, and the relationship between these two ...
1
vote
2answers
120 views
Please explain this circular movement problem [closed]
I was working over some problems from my physics textbook, and I came across this one, it involves circular movement:
A car with the mass of 1t is moving over a hill with the velocity of 20 m/s. The ...
1
vote
3answers
649 views
Centripetal force of a rotating rigid body?
Consider someone pushing a roundabout in a playground. Initially the
roundabout is stationary, but when it is pushed, it rotates with
increasing rotational speed.
The force of the push is ...
2
votes
5answers
294 views
Find drag force on link of rotating chain
Given a closed chain with a total length of 1.2m rotating at 1'800 rpm and a total mass of 0.4kg, what is the drag force pulling on one chain link?
I originally thought that since no link size was ...
2
votes
3answers
960 views
Why did they add a Centripetal Force in the Free-Body Diagram?
problem
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solution
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Why do they have the centripetal force in there? I understand that the normal force is the centripetal force here, but why would they say "or $\frac{mv^2}{r}$"? I thought it ...
2
votes
4answers
347 views
why does what get pushed away when centripetal acceleration is towards the center
If centripetal acceleration is towards the center, then why - when you spin a bucket of water (a classic demonstration) - does the water not get pushed out but rather stays in the bucket without ...
