Physics 12 Practice Quiz for Work and Energy

For 90%

1)      A dog owner pulls on the dog’s leash with a force of 50N at an angle of 25º to the horizontal in taking the dog 500m on a level walk.  How much work do they do?

2)      A puck with initial speed of 1.0m/s slides across an ice rink until it comes to rest.  If the coefficient of kinetic friction is 0.10 find how far it travels.

3)      A pendulum bob at the end of a 2.0 m string is let go from rest when the string is horizontal.  Find the speed at the lowest point in the arc.

For 100%

1)      A puck slides up a ramp inclined at 30º to the horizontal with an initial speed of 2.0m/s.  If the coefficient of kinetic friction is 0.30 find how far it will slide before stopping.

2)      A rollercoaster has a speed of 10m/s at the bottom of the first hill.  How fast will it be traveling at the top of the next hill if it is 10m above the previous position?