Recent content by elvinc

Hi, I'm not quite getting this. Say we lift a block of weight 10N through a vertical height of 1 metre. So the work done is 10 x 1 = 10J. This 10J equals the g.p.e. Of the block. Now we pull the block up the same height of 1 metre but along a smooth, straight ramp (no friction between...

Hi, The simple definition of work done by a constant force on moving a constant mass is (size of) force on object multiplied by (size of) distance object moves in direction of force while force is applied In the ideal case of a puck on frictionless ice, an applied constant force will...

That's the nub of your misunderstanding methinks In Newtonian mechanics (and probably other mechanics that use the idea of force) bodies do not carry force, forces act on bodies (if they are external) and cause a change in their motion / momentum either acceleration or deceleration. Newton 1...

The low mass body is not accelerating because no overall force is acting on it. However, the body has momentum. When bodies collide, elastically or inelastically, the total linear momentum of the system is conserved (assuming not rotation/spinning) . Some of the momentum of the moving body...

That makes sense. Thanks. A couple of follow on questions. 1. Am I correct in thinking that the upthrust, T, that occurs when an object is immersed in a fluid is a result of the difference between: the upward force (U) (resulting from the pressure exerted on the underside of the object Pu)...

Hi, Can someone explain to me what happens when an object sinking in a liquid, hits the bottom of the container holding the liquid. I accept this is an "ideal" situation but it has turned up something I don't understand. So, say we have a box with rectangular faces (a cuboid) that is...

What is special about the end positions of the rod? Surely, the point is exactly on the rod at any point between -a and +a and the infinities would arise at any position? Clive

I'm going to approach this problem by cancelling ``balanced'' forces then integrating what is left. If the particle is at position x^\prime then its distance from the right-hand end (+a) is a - x^\prime. I'm assuming that x^\prime is in the positive part of the x-axis but I'm pretty confident...

Hi, I have attempted a basic gravitation question from “Classical Mechanics” R. Douglas Gregory (1st ed). I get the answer provided at the back of the book, but it doesn't make sense to me. Can someone help me interpret the answer? Question: Pg 71, Q3.3 A uniform rod of mass M and...

Hello I understand Homework Statement 1) a potentiometer can be used to divide a voltage to any value between zero and the voltage source. This can be used to place a variable voltage through a resistor 2) A rheostat (variable resistor) which is placed in series with the resistance...