Solve the work problems
If this kid pushed a chair across the floor 20 meters with a 5N force, how much work is done?
100 Joules
A horse performs 15,000 joules of work pulling a wagon for 20 seconds. What is the horse's power?
750 Watts
Joe does 30 joules of work to push a box 2 meters. How much force did Joe use
15 Newtons
To open a soda bottle, a force of 55N is applied to the bottle opener. If the bottle opener applies a force of a 675N to the cap, what is the mechanical advantage?
12.27n
To pull a nail out of the wood, a man does 2500J of the work. The hammer he uses does 500J of the work. What is the efficiency of the hammer?
20%
A train pulls a load 40 meters with 3000N of force. How much work is done?
70,000 Joules
If it takes 50 seconds to lift 10 Newtons of books to a height of 7 meters, calculate the power required.
1.4 Watts
An elephant moved a crate 5 meters with 45 joules of work. How much force did it use?
9 Newtons
A force of 30N is applied to a screwdriver to pry the lid off a can of paint. The screwdriver applies 75N of force to the lid. What is the mechanical advantage of the screwdriver?
2.5n
To pull a nail out of the wood board, a carpenter does 1,000J of the work. The hammer he uses does 5835J of the work. What is the efficiency of the hammer?
83.5%
A kid pushed a wagon in 15 seconds with a 40N of force. He pushed it a total of 10 meters before he gave up. How much work did he use?
400 Joules
A box is pushed across the floor for a distance of 5 meters with a force of 50 Newtons in 5 seconds. What is the power?
50 Watts
A bird moves her babies 5 meters with a force of 60 joules. How much force did the bird use.
12 Newtons
To remove a tree stump, Marshall puts one end of a long beam under the stump and puts all his weight on the other end.The stump weighs 400N. Marshal weighs 250N. What is the mechanical advantage of the lever Marshall is using?
1.6n
A stage crew member uses a pulley system to lift scenery for the school play. If he does 750J of work and the pulley system does 600J of work, what is the efficiency of the pulley system?
80%
A box is pushed across the floor for a distance of 5 meters with a force of 50 Newtons in 5 seconds. How much work is done?
250 Joules
A 500N passenger is inside a 24,500N elevator that rises 30 m in exactly 1 minute. How much power is needed for the elevator's trip?
12,500 Watts
A desk was pushed 12 meters with 96 joules of work. What is the force?
8 Newtons
Amanda uses a wheelbarrow to lift a load of bricks. The bricks weigh 600N, which is more than Amanda could normally carry. However, with the wheelbarrow, Amanda can lift the bricks with as little as 120N. What is the mechanical advantage of the wheelbarrow?
5n
A ramp is used to load furniture onto a moving truck. The person does 1,240J of work pushing the furniture up the ramp, and the ramp does 822J of work. Calculate the efficiency of the ramp.
66.29%
A power rating of an electric lawn mower is 2000 watts. If the lawn mower is used for 120 seconds, how many joules of work can it do?
240,000 Joules
A student who weighs 500 Newtons climbed the stairs from the first floor to the third floor, 15 meters above, in 20 seconds. What was the power?
375 Watts
Dan does 30 joules of work to push the pencil over 15 meters. How much force does he use?
2 Newtons
To open a can, a force of 100n is applied to the can opener. If the can opener applies a force of 750n to the lid, what is the mechanical advantage of the bottle opener?
7.5n
A ramp is used to load a refrigerator onto a moving truck. The person does 27J of work pushing the refrigerator up the ramp, and the ramp does 82J of work. What is the efficiency of the ramp?
32.9%