Download In-Class Examples: Elastic Potential Energy and Non

Ramsay – A.P. Physics B – Fall 2013
Spring Woods High School
Name:______________________________________________________ Date: ___________
In-Class Examples: Elastic Potential Energy and Non-Conservative Forces
1. A load of 50 N attached to a spring hanging vertically stretches the spring 5.0 cm.
The spring is now placed horizontally on a table and stretched 11.0 cm. What
force is required to stretch the spring this amount?
2. A slingshot consists of a light leather cup, containing a stone, that is pulled back
against 2 rubber bands. It takes a force of 30 N to stretch the bands 1.0 cm.
a. What is the potential energy stored in the bands when a 50.0 g stone is
placed in the cup and pulled back 0.20 m from the equilibrium position?
b. With what speed does it leave the slingshot?
3. The tallest and fastest roller coaster in the world used to be the Steel Dragon in
Japan. The ride includes a vertical drop of 93.5 m. The coaster has a speed of 3
m/s at the top of the drop.
a. Neglect friction and find the speed of the riders at the bottom. (42.9m/s)
Ramsay – A.P. Physics B – Fall 2013
Spring Woods High School
b. Find the work due to non-conservative forces on a 55kg rider during the
descent if the actual velocity at the bottom is 41 m/s. (- 4416.5 J)
4. A 20-kg sled rests at the top of a 30° slope 80 m in length. If 𝜇! = 0.2, what is the
velocity at the bottom of the incline? (22.6m/s)