Potential Energy and Solution
Work and Energy Worksheet
Section 1 Work:
1. A person pulls a toboggan for a distance of 35.0m along the snow. The force in the rope
(tension) is 94.0N. How much work is done on the sled? Solution:
W= Fd W= 94.0N x 35.0m W= 3290 Nm or J
2. The cable of a large crane applies a force of 2.2x10^4N to a demolition ball as it lifts it vertically a distance of 7.6m. a) How much work is done on the ball? b) Is the work positive or negative? Why? Solution: A.) W=( 2.2x10^4N) ( 7.6 m) W= 1.6x10^5 Nm or J B.) Positive, because the force on the system is positive. 3. When spring arrives a woman packs her winter clothes in a box and lifts it at a constant velocity to the top shelf of her closet, a distance of 1.8m above the floor. If the clothes weigh 150N, how much work is done in lifting them? Solution:
W= (150N) (1.8M) W= 270Nm or J
4. A luggage carrier is pulled 50.0m with a force of 30.0N, how much work is done on the carrier? Solution:
W= (30.0N) (50.0m) W= 1500Nm or J
5. You are moving into a new apartment. Your weight is 685N and your belongings have a weight of 915N. How much work does the elevator do in lifting you and your belongings
5 stories (15.2m)? Solution:
W= (685N+915N) (15.2m) W= (1600N) (15.2m) W= 24,320Nm or J
Section 2 Gravitational Potential Energy:
6. A 0.15kg ball is thrown 9.0m straight up. What is the work done by the gravitational force? And what is the change in PE? (Notice anything?) Solution:
PE= m*a*h PE= (0.15kg) (9.8 m/s^2) (9.0) PE= 13.23 kg m^2/s^2 or J
- The change in PE and the calculated on the 1st question are the same.
7. A shot-putter puts a shot (weight 71.1N) that leaves his hand at a distance of 1.52m above the ground. a) Find the work done by gravity when the shot reaches a height of 2.13m.
b) Determine the change in potential energy. Solution:
a.) W=( 71.1N) (2.13m) W= 151.44Nm or J
b.) PE=
Section 1 Work:
1. A person pulls a toboggan for a distance of 35.0m along the snow. The force in the rope
(tension) is 94.0N. How much work is done on the sled? Solution:
W= Fd W= 94.0N x 35.0m W= 3290 Nm or J
2. The cable of a large crane applies a force of 2.2x10^4N to a demolition ball as it lifts it vertically a distance of 7.6m. a) How much work is done on the ball? b) Is the work positive or negative? Why? Solution: A.) W=( 2.2x10^4N) ( 7.6 m) W= 1.6x10^5 Nm or J B.) Positive, because the force on the system is positive. 3. When spring arrives a woman packs her winter clothes in a box and lifts it at a constant velocity to the top shelf of her closet, a distance of 1.8m above the floor. If the clothes weigh 150N, how much work is done in lifting them? Solution:
W= (150N) (1.8M) W= 270Nm or J
4. A luggage carrier is pulled 50.0m with a force of 30.0N, how much work is done on the carrier? Solution:
W= (30.0N) (50.0m) W= 1500Nm or J
5. You are moving into a new apartment. Your weight is 685N and your belongings have a weight of 915N. How much work does the elevator do in lifting you and your belongings
5 stories (15.2m)? Solution:
W= (685N+915N) (15.2m) W= (1600N) (15.2m) W= 24,320Nm or J
Section 2 Gravitational Potential Energy:
6. A 0.15kg ball is thrown 9.0m straight up. What is the work done by the gravitational force? And what is the change in PE? (Notice anything?) Solution:
PE= m*a*h PE= (0.15kg) (9.8 m/s^2) (9.0) PE= 13.23 kg m^2/s^2 or J
- The change in PE and the calculated on the 1st question are the same.
7. A shot-putter puts a shot (weight 71.1N) that leaves his hand at a distance of 1.52m above the ground. a) Find the work done by gravity when the shot reaches a height of 2.13m.
b) Determine the change in potential energy. Solution:
a.) W=( 71.1N) (2.13m) W= 151.44Nm or J
b.) PE=