Centripetal force Definition and 562 Threads

[Note from mentor: this thread was originally posted in one of the non-homework forums, therefore it does not use the standard homework template.] ----------------------------------- Hi, I am self-studying ap physics, and as I have no teacher to guide me, am seeking help online. I have a...

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Gravity is weaker on equator. What I know, this effect is due to combination of two factors: 1. Earth is rotating with surface speed 450 m/s on equator and this is causing centripetal force which is decreasing gravity. 2. Earth is flattered on poles, so that means that there is longer distance...

if the centripetal force can be only provided by normal contact force. centripetal velocity is Vs. If V<Vs, then it will lose contact of the road? Or it will lose contact when n=0? Or when n<0? THX

Hi! I'm new here, so I apologize on beforehand for any mistakes I may make (grammar/wrong thread etc.). Currently we are doing a project for our exam in my class, and in my group we chose to focus on the following scenario: On a spinning "plate" (you know, like a merry-go-around... sorry, I'm...

Homework Statement The centripetal force acting on an object is doubled. The radius is also doubled. The speed of the object: (a) increases by a factor of 4 (b) increases by a factor of 2 (c) decreases by a factor of 2 (d) The change in the object's speed depends on its mass Homework...

How Can I Prove this Physically Homework Statement [/B] So I need to do a project where I prove centripetal acceleration. All the cases I've seen of where it's proved is using formulas, though I need an actual project. By an actual project I mean something like...

Uniform circular motion requires a force perpendicular to the velocity. Therefore, the work done by such a force is zero because the dot product of the force and the path is zero. So there is no energy gain beyond the kinetic energy arising from its constant speed. But if I have a mass (rocket...

I was thinking about the motion of two stars in a binary star system, but there is something I cannot quite figure out. Suppose you have a binary star system with two stars masses m1 and m2 with m2>m1 so that m2 is closer to the centre of mass of the system. Then when the two stars are as far...

Homework Statement http://www.sumoware.com/images/temp/xzfrbardcbliotkt.png [/B] A box travels in a circular track like the picture above. How much velocity it must have in point A to get out of the track when reaching point B ? Homework Equations Fcentripetal = m V^2/R E = E' The Attempt...

Hey guys, new to the forum here and I have a general question regarding the centripetal force. In the example of a ferris wheel where there is a normal force pushing up against the person and the gravitational force pulling the person down, which force is centripetal? I know that the centripetal...

Hi there! I've been searching the internet for hours trying to find a decent explanation to this question. I'm thinking particularly of the example of a precessing spinning top. (Note: I own this diagram. Please do not use it without direct and written permission.) So when the top is tilted...

Homework Statement The radius for the inside of a curve is half the radius for the outside. With 2 cars of equal mass, car A travels on the inside and car B travels on the outside at equal speed. Which statement is correct? a. The force on A is half the force on B b. The force on B is half the...

Hello. I have currently just started styding magnetism. My book states that an electic charge moving perpendicular to the magnetic field will cause the particle to move in a circular motion. This formula describes the motion of the particle: qvB=mv2/r According to the formule F=qvBsinα, the...

Why do we use coefficient of static friction instead of coefficient of kinetic friction in bank curve problems

I'm confused about how it is possible for speed to be constant when a centripetal force is being applied to an object. If something is orbiting a planet, when it is at what one person considers the top of the planet, all of the objects velocity is in the horizontal direction, and all of the...

I noticed that if you swing a ball around attached to a string with a centripetal force. The ball also rotates. What causes this rotation? Is there always rotation when there's a centripetal force? does an object orbiting the Earth always face the same way as it orbits?

So I was thinking, I remember a physics experience where you hold and spin the wheel on a stick, if you hold the left side of the stick, the right side would stay up because of torque. Now if you assume the force of torque to be going up to counteract gravity and the other side of the torque...

As a car makes a turn, there is a centripetal force due to friction causing this turn if I'm correct. How is this possible if the tangent line of the turn is the direction of the cars motion, and friction acts in the opposite direction? I would think that the force of friction where the...

Hi all, If anything here is incorrect or confusing or seems trivially simple, I apologize: I'm not a physicist and created an account specifically to get help on this from some people who are! My question is this: Assume a plane has a constant airspeed and you wish to fly a circular pattern...

Homework Statement A roller coaster is on a track that forms a circular loop in the vertical plane. If the car is to just maintain contact at the top of the loop, what is the minimum value for its centripetal acceleration at this point? A) 2g downward B) g downward C) 2g upward D) g upward E)...

Homework Statement Basically, we did a centripetal acceleration lab where a hanging mass(s) was connected to a string, run through a tube, and connected to a rubber stopper. The force of gravity of the hanging mass is what supplied the force of tension to the rubber stopper for its centripetal...

Homework Statement 50.5 m radius 19 m/s speed µ = 0.2 acceleration due to gravity is 9.8 m/s2 At what angle θ should it be banked for maximum control of the racing car? Homework Equations sum of total forces=0? The Attempt at a Solution N*cosθ=mg N*sinθ-mgµ=(mv^2)/r mg*tanθ-mgµ=(mv^2)/r...

Homework Statement If you have a motor pulley and a drum pulley connected by a belt then how do you explain why the belt can sometimes slip if the washing machine is rotating too fast? Homework Equations The Attempt at a Solution I know that the answer involves the tension of the belt being...

1. A jet pilot feels 5.00 times her normal weight at the bottom of a vertical loop. The loop has a radius of 1.50 km. What is the speed of the jet at the bottom of the loop?2. F(centripetal)=(mv^2)/r3. The problem I'm having is with this equation that I've made based on the equation...

Homework Statement I have no values at all, so it's just going to be the variables in the relevant equations. I need to define mu using those variables. A carousel is moving in a circle at velocity v and has a radius r. It is moving fast enough that each person with mass m is pinned against the...

Homework Statement A stunt driver for a movie needs to make a 2545kg car skid on a large, flat, parking lot surface. The force of friction between the tires and the concrete surface is 1.75x10^4N and he is driving at a speed of 24m/s. As he turns more sharply, what radius of curvature will he...

Torque causes a system to rotate about its axis while centripetal force causes a system to rotate about the axis of the separate system that exerted the centripetal force. So does this mean that torque specifically causes rotation and centripetal force causes revolution?

So I know for a mass m with velocity v to travel in a circular motion, there has to be a centripetal force towards the center, but I'm having trouble intuitively visualizing why friction is directed towards the center? The way I see it, is for the car to turn , say left, the wheels rotate to...

Homework Statement A mass of 2.0 x 10^2 g is tied to a 1.6 m long string and spun in a vertical circle. What is the minimum frequency to keep the mass moving? Homework Equations Fc=m4(pie)rf^2 The Attempt at a Solution I know I have to use this equation and make it equal to another to find Fc...

There is a banked curve problem asking for the correct angle to keep the car on the road: http://imgur.com/Ni3j6dB My teacher said the following equation must be used to find normal force: F(normal) = F(gravity)/cosθ Why is it, that you cannot find the x-component of the normal...

Homework Statement A civil engineer is asked to design a curved section of roadway that meets the following conditions: With ice on the road, when the coefficient of static friction between the road and rubber is 0.12, a car at rest must not slide into the ditch and a car traveling less than 70...

How would you go about proving that centripetal F=(mv^2)/r by diagramming and solving for the magnitude of the forces in the x and y direction? For example, suppose I wanted to calculate the work done in the radial direction by centripetal force.

Actually, I am going to do a centripetal force apparatus lab tmr morning. Here I get some pre-lab questions. In this lab, we are going to use economy force sensor (as I know there are 2 types, but it doesn't matter). There is one question related to this sensor... It says "The 'Tare' button on...

I made notes on this in class, but I did not understand everything about it. So, what I know is that vertical motion is when the object goes around in a circle like this: And horizontal I guess it is like this: But then I am very confused regarding what my teacher told me for horizontal...

(Look at attached pic) The red ball is attached to a string which is being spun in a vertical circle. The downwards force is gravity and the other green one is the tension force. The blue is the sum of the green vectors. It is the centripetal force because it's the net force (and thus is equal...

Supposed that a man is standing on the edge of a spinning merry-go-round which rotates at an constant angular speed with respect to a stationary fame of reference(the ground), there will be a centripetal force pulling him toward the centre of the marry-go-round and prevents him from sliding off...

Homework Statement To explain why water falls out of a bucket when it is not being swung fast enoughHomework Equations a = mv^2/r The Attempt at a Solution I have had a look on previous threads and nearly get it but still a bit confused. When the bucket is upside down and the required...

Definition/Summary Centripetal force is not a separate force. It is only an alternative name for the radially inward component of tension or friction or other force or forces on a body. In a free body diagram, centripetal force should never be mentioned by name (it should be called...

Homework Statement In a test of machine-part reliability, a specimen of mass m is swung in a vertical circle of constant radius .75 m. When the object is at the bottom the circular path, the tension in the supporting wire is found to be six times the weight of the object. Determine the...

Homework Statement Homework Equations F_{c} = \frac{mv^{2}}{r} The Attempt at a Solution I think the normal force would be the magnitude of vector sum of centripetal force and gravitational force. So I did: N = \sqrt{(\frac{mv^{2}}{r})^{2} + (mg)^{2}} However, it isn't one...

A stuntman swings from the end of a 4 m long rope along the arc of a circle. If his mass is 70 kg, find the tension in the rope required to make him follow his circular path at (a) the beginning of his motion, assuming he starts when the rope is horizontal, (b) at a height of 1.5 above the...

Homework Statement A car of mass 2000 kg rounds a circular turn of radius 20 m. If the road is flat and the coefficient of friction is 0.7 between the tires and road, how fast can the car go without skidding? Homework Equations Fc = m(v2/r) The Attempt at a Solution I tried to find...

I get the theory: Fc = Ft + Fg Uniform circular motion, in the vertical plane. Fc = net force = centripetal force Ft = force of tension in the string Fg = force of gravity so at the top, with vector addition: Ft = Fc- Fg And if we define 'up' as positive, then should the equation look like...

I find physics classroom demonstrations of centripetal force dishonest, they often resort to trickery to demonstrate this apparent "inward pull" on a body in circular motion. Two examples follow 1, Centripetal force "pulling" a candle flame towards the center of a spinning turntable 2...

Hey guys, first post here! Hoping to get a little help. Homework Statement You are a traffic safety engineer in charge of determining safe speeds for roads. A particular banked curve has a radius of 11.0 meters and is banked at an angle of 8.00°. The coefficient of static friction between...

Homework Statement Two masses M of the same amount are tied to two stings of length L and 2L. If both masses are swung in unison faster and faster, which string will break first? Homework Equations The formula I've been using is Tension = mv^2/r. The Attempt at a Solution My...

Homework Statement Could centripetal force be used to create a sort of artificial gravity aboard the space station? If so, how would you go about this? Homework Equations The Attempt at a Solution At first I wanted to say yes, but how fast would the space station have to rotate...

Homework Statement One of Saturn's satellites travels in a circular orbit at a velocity of 19481 m/s. Saturn's mass is 5.69x10^26 kg. What is the radius of the satellites orbit? Homework Equations Fg = (G * m1 * m2) / (r^2) Fc = (m*v^2)/(r) The Attempt at a Solution The...

Hello! Finals are coming up in less than a week and I received some sample problems as review for the exam. I have my work layed out and a draft for it, but I would like some reassurance, if that's okay. :-) Anyway, here is the sample problem: You have been contacted by StM.org (Stop the...