i) 2.56m/s<br/>
ii)0.0989m

Here we solve for the velocity of a disk as it's rolling up a circular hill using energy methods 1) Find work done by external forces (it's 0). 2) Notice there is rotation so the kinetic energy is 0.5 m (v2^2 - v1^2) + 0.5 I (w2^2 -...

A 55 g mass is attached to a light string, which is placed over a frictionless, massless pulley, and attached to a 199 g block which is on a board inclined at 39.3° as shown. Assuming the block starts at rest and the μk between the...

Given certain parameters, how would you solve this problem?<br/>
Newton's Laws Of Motion With Friction, Part 4

Normal Force: provides force perpendicular to the surface and only away from the surface



Pin support: Provides forces in x and y direction (for

2d plane)

Roller support: Provides forces perpendicular to the...

This video explains the physics of how wheelies work!

Lisa, are you serious? Alright, just one more favor. This one is a little trickier than the previous, because there is some trigonometry involved, beyond the kinematics and friction from the previous problems. What will become of your...

Given certain parameters, how would you solve this problem in Y direction?<br/>
Newton's Laws Of Motion With Friction, Part 2

Kinetic friction summary

You're really getting good at building physics toys in your garage! Check this awesome pulley system. You put your physics knowledge to the test and try to make a prediction about what will happen when you let these two blocks go. Will...

Lisa is moving again already! I dunno, I think there were bedbugs. This time you have a different plan, but you will still need kinematics and Newton's laws to find out how much time and effort stand between you and more snacks. Give it...

What is friction? What are the two types of frictional forces?<br/>
Newton's Laws Of Motion With Friction, Part 1

Mechanical energy problem 4 part 2

This video covers a basic example which involves the work energy equation.

Vector Man rescues a waiter from a burning restaurant, but forgets to put out the fire! This lesson will explain how to draw free body diagrams.<br/>
Definitions included: free body diagram, net external force

A birthday party isn’t complete without cake, music and drama! This lesson will introduce the most common types of contact forces encountered in Physics.

Definitions included: contact force, normal force, friction force, static...

It’s no surprise that forces are everywhere! But how do we work out which forces are important, and which ones can be ignored? This lesson will distinguish between external and internal forces, before diving into more examples of contact...

Mass is just a fancy sciency word for weight, right? Wrong! Although related, they aren't the same thing. You'd better find out exactly what the difference is so that you don't look foolish around the water cooler!

Derivation of Pendulum equations method 1

Pulley example

Find the acceleration of the center of mass of the disk. 1. Use F = ma AND M = I alpha 2. Assume pure roll ie a = r alpha 3. Check validity of assumption ie, F less than Fmax 4. If F less than Fmax, THEN assumption is true 5. If F...

How to find the minimum coefficient for an object to roll without slipping on an incline.

Here we solve for the constant tension in the rope of a pulley system in static equilibrium. Remember the assumption that the tension is uniform everywhere is valid if:

1) The system is in static equili
brium
2) The rope i
s...

Hey guys, this video covers the intuition behind friction. Friction always acts in the direction opposite to the applied force. Using this and the fact that the static coefficient of friction is different to the kinetic coefficient of...