Pulleys, Gears, and Levers Flashcards
7 cards from real FCTC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Pulleys, Gears, and Levers flashcards as text
A bevel gear set is used primarily to accomplish which task?
Answer: Transmit power between shafts at an angle
Bevel gears are cone-shaped and designed to transmit motion between shafts that intersect at an angle, commonly 90 degrees.
A scissors jack on a car is an example of which simple machine principle?
Answer: Lever and screw combination
A scissors jack uses a screw to force levers apart, combining lever and screw simple machines to multiply force and lift a vehicle.
In a clock, why are gears of different sizes used together?
Answer: To control different speeds for hour, minute, and second hands
Different gear ratios in a clock cause the hour, minute, and second hands to rotate at precise, different speeds from the same power source.
When the effort arm of a lever is shorter than the load arm, the lever provides which of the following?
Answer: Less force but greater speed and range
When the effort arm is shorter than the load arm, mechanical advantage is less than 1 — you apply more force but gain speed and distance.
A worm gear is most commonly used to achieve which result?
Answer: Very large gear reductions in a compact space
Worm gears provide very high gear reduction ratios in a small package and are often self-locking, preventing back-driving.
On a bicycle, shifting to a larger rear sprocket (more teeth) while pedaling causes what effect?
Answer: Easier pedaling but slower wheel speed
A larger rear sprocket creates a lower gear ratio, making pedaling easier but causing the wheel to turn slower per pedal stroke.
What does the term 'mechanical advantage' measure in simple machines?
Answer: The ratio of output force to input force
Mechanical advantage is the ratio of the force a machine exerts on a load (output force) to the force applied by the user (input force).