I. Read and answer the questions carefully and choose the letter of the best answer by writing before the number on the space provided for.
______1.Which of these is used to raise and lower the flag?
lever B. pulley C. pull D. ramp
______ 2.The door knob is an example of what of simple machine?
A. wedge C. screw
B. wheel and axle D. pulley
______ 3.What type of a lever is a wheel and axle?
A. First class lever C. Third class lever
B. Second class lever D. Fourth class lever
______ 4. Which of these is NOT an inclined plane.
ramp B. stairs c. slide D. egg beater
______ 5. Which of these is NOT a wheel and axle?
A. key, paper clip C. door knob, steering wheel
B. bicycle, windlass D. grinders, capstan
______1.Which of these is used to raise and lower the flag?
lever B. pulley C. pull D. ramp
______ 2.The door knob is an example of what of simple machine?
A. wedge C. screw
B. wheel and axle D. pulley
______ 3.What type of a lever is a wheel and axle?
A. First class lever C. Third class lever
B. Second class lever D. Fourth class lever
______ 4. Which of these is NOT an inclined plane.
ramp B. stairs c. slide D. egg beater
______ 5. Which of these is NOT a wheel and axle?
A. key, paper clip C. door knob, steering wheel
B. bicycle, windlass D. grinders, capstan
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ANSWERS
EXPLANATION
1. — flagpole uses a pulley to raise a flag far above your head. It also helps to bring the flag back down. Without a pulley, it would make it nearly impossible to raise a flag up a flagpole.
2. — A doorknob is a simple machine that only has two main parts
3. — The wheel and the axle is a second class lever in this special circumstance of being able to rotate completely. The wheel is where the effort force is applied, while the axle carries the load force. The radii of each are the effort and load distances. The fulcrum of a wheel and axle system is the center of the wheel.
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