Tennessee Science Grade 7

Chapter 14: Work and Simple Machines

Calculating Mechanical Advantage

1
To pull a weed out of a garden, you can apply a force of 50 N to the shovel. The shovel applies a force of 600 N to the weed. What is the mechanical advantage of the shovel?
A)12
B)10
C)8
D)15
2
To pry a nail out of a wall, you can apply a force of 50 N to the hammer. The hammer applies a force of 650 N to the nail. What is the mechanical advantage of the hammer?
A)13
B)10
C)15
D)11
3
To lift a block on a movable pulley, you can apply a force of 50 N to a rope. The rope applies a force of 700 N to the block. What is the mechanical advantage of the rope?
A)14
B)10
C)16
D)18
4
To pull apart two pieces of wood, you can apply a force of 50 N to the lever. The lever applies a force of 640 N to the weed. What is the mechanical advantage of the lever?
A)13
B)15
C)17
D)11
5
To lift a refrigerator, you can apply a force of 50 N to the wedge. The wedge applies a force of 550 N to the weed. What is the mechanical advantage of the wedge?
A)11
B)9
C)13
D)18
6
To pry open a soda can lid, you can apply a force of 50 N to a car key. The car key applies a force of 390 N to the lid. What is the mechanical advantage of the car key?
A)8
B)6
C)10
D)12
7
To lift a bookshelf, you can apply a force of 50 N to a wedge. The wedge applies a force of 800 N to the bookshelf. What is the mechanical advantage of the wedge?
A)16
B)18
C)20
D)22
8
To pry a wooden board off of a treehouse, you can apply a force of 50 N to a lever. The lever applies a force of 750 N to the weed. What is the mechanical advantage of the lever?
A)15
B)18
C)12
D)13
9
To lift a television, you can apply a force of 50 N to a wedge. The wedge applies a force of 480 N to the weed. What is the mechanical advantage of the wedge?
A)10
B)12
C)15
D)22
10
To pull a tree out of a yard, you can apply a force of 50 N to the shovel. The shovel applies a force of 900 N to the weed. What is the mechanical advantage of the shovel?
A)18
B)12
C)20
D)16
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