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Cards In This Set
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An induction clutch works by:A. MagnetismB. Pneumatics C. Hydraulics D. Friction
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An induction clutch is a magnetic clutch.
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If a first class lever with a resistance arm measuring 2 feet and an effort arm measuring 8 feet are being used, what’s the mechanical advantage?A. 2B. 4C. 6D. 1
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4 Mechanical advantage can be calculated as Length of Effort Arm ÷ Length of Resistance Arm. MA = 8 ÷ 2 = 4.
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 The bottoms of four boxes are shown below. The boxes all have the same volume. If postal regulations state that the sides of a box must meet a minimum height, which box is most likely to be too short to go through the mail?A. No. 4B. No. 2C. No, 1D. No. 3 |
No. 3 The box with the largest area on the bottom will have the shortest sides. If length × width × height = volume, and all the boxes have equal volume, then the sides must be shortest on the box with the largest area on the bottom. Calculate the area of each box bottom: No. 1 = 20 square inches; No. 2 = 35 square inches; No. 3 = 48 square inches; and No. 4 = 27 square inches. No. 3, which has the largest area, will have the shortest sides.
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 Looking at the figure below, when Cat B lands on the seesaw, Cat A will:A. Remain stationaryB. Hit the ground hardC. Rise in the air quickly D. Enter the stratosphere |
Rise in the air quickly Cat B landing on the seesaw will propel Cat A into the air.
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Air weighs about 15 psi. What’s the amount of pressure (force) exerted on the top of your head, given a surface area of 24 inches?A. 360 poundsB. 625 pounds
C. 5/8 poundsD. 180 pounds |
360 pounds Power equals force divided by area in square inches (P = F/A). This formula can also be stated as F = A × P. Substitute the known quantities. F = 15 × 24 = 360 pounds.
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A simple pulley gives a mechanical advantage of: A. 2B. 1C. 3D. Unknown
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1 A simple pulley gives no mechanical advantage, although it does make work easier by spreading out the work needed over several tries. So the mechanical advantage is 1
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 The baskets are balanced on the arm in the figure below. If cherries are removed from Basket B, to rebalance the arm:A. The fulcrum will have to be moved to the right. B. Basket B will have to be moved to the right. C. Basket A will have to move to the left.D. Basket A will have to move to the right. |
Basket A will have to move to the right. Moving Basket A to the right counterbalances the loss of cherries from Basket B.
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 If both Wheel A and Wheel B revolve at the same rate in the figure below, Wheel A will cover a linear distance of 12 feet:A. Faster than wheel BB. Slower than wheel BC. In about the same time as wheel BD. Half as quick as wheel B |
Faster than wheel B Wheel B has to make more revolutions to cover the same ground as Wheel A, so it will cover the distance more slowly.
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If a force of 200 pounds is exerted over an area of 10-square inches, what’s the psi? A. 10B. 15C. 20D. 200
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20 You can calculate psi as Pressure = Force÷Area. So, in this problem, P = 200÷10 = 20.
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 In the figure below, if Cat A moves toward the middle of the seesaw to get a better look at the mouse, Cat B will:A. Remain stationaryB. Move toward the groundC. Rise in the airD. Instigate a cat fight |
If Cat A moves toward the center, Cat B will move toward the ground.
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