Download Work and Power Practice Problems

Work and Power Practice Problems
(Monday)
1. A box is pulled with a horizontal force of 500N and moves 5m. What is the
work done?
2. A 5kg mass is lifted upward at a constant speed to a height of 10 m.
a. Calculate the work done by the lifting force?
b. Calculate the work done by gravity.
3. Calculate the work done by gravity when a 10kg mass is pulled across a
smooth floor at a constant speed.
4. How much power is required to raise a 5 kg object up at a constant speed
of 50 m/s?
5. How much work does a 100 Watt motor perform in 5 minutes?
6. A 100N load is lifted to a height of 5 m in 30 seconds. Calculate the power.
7. A 10kg box slides to a stop over a distance of 5m. The surface has a
coefficient of friction of 0.26.
a. Draw a free body diagram for the box.
b. Calculate the work done by each force on your FBD.
8. A shopper pushes a cart with a force of 35N directed at an angle 25o
downward from the horizontal. Find the work done by the shopper on the
cart if the shopper moves the cart 50m.
9. If 2J of work is done in raising a 180g apple, how far was it lifted?
10.
How long does it take a 19kW steam engine to do 6.8 x 107J of work?
11.
Calculate the work done from d=0 to d=5.
12.
Calculate the work done by the pulling force as the box is pulled
10m.
13.
Calculate the work done by the pushing force as the box moves 10m.
Work and Power Practice Problems
(Monday)
1. A box is pulled with a horizontal force of 500N and moves 5m. What is the
work done?
2. A 5kg mass is lifted upward at a constant speed to a height of 10 m.
a. Calculate the work done by the lifting force?
b. Calculate the work done by gravity.
3. Calculate the work done by gravity when a 10kg mass is pulled across a
smooth floor at a constant speed.
4. How much power is required to raise a 5 kg object up at a constant speed
of 50 m/s?
5. How much work does a 100 Watt motor perform in 5 minutes?
6. A 100N load is lifted to a height of 5 m in 30 seconds. Calculate the power.
7. A 10kg box slides to a stop over a distance of 5m. The surface has a
coefficient of friction of 0.26.
a. Draw a free body diagram for the box.
b. Calculate the work done by each force on your FBD.
8. A shopper pushes a cart with a force of 35N directed at an angle 25o
downward from the horizontal. Find the work done by the shopper on the
cart if the shopper moves the cart 50m.
9. If 2J of work is done in raising a 180g apple, how far was it lifted?
10.
How long does it take a 19kW steam engine to do 6.8 x 107J of work?
11.
Calculate the work done from d=0 to d=5.
12.
Calculate the work done by the pulling force as the box is pulled
10m.
13.
Calculate the work done by the pushing force as the box moves 10m.