P5.24 Levers and gears (TRIPLE)

What is the main purpose of using a lever as a force multiplier?

• To increase the weight of the object being lifted

• To make the load move faster than the effort

• To increase the force applied to the load

Why is a small applied force able to lift a heavy load using a lever?

• Because the load is placed closer to the pivot than the effort

• Because the lever makes the load lighter

• Because the effort is applied directly above the load

In scissors, why is the applied force much less than the cutting force?

• The effort is applied at the midpoint of the blades

• The blades are longer than the handles

• The handles are longer than the distance to the pivot

What is a key characteristic of a gear system?

• Gears always reduce the turning effect

• Gears transmit the rotational effect of a force

• Gears reduce the need for a pivot

In a low gear setting in a car, what is the relationship between speed and turning effect at the output shaft?

• High speed and high turning effect

• Low speed and high turning effect

• High speed and low turning effect

What happens when a large gear drives a smaller gear?

• The smaller gear turns more slowly than the larger one

• The smaller gear turns at the same speed

• The smaller gear turns faster than the larger one

Why does a high gear give a low turning effect?

• The output shaft turns slower

• The input shaft is closer to the wheels

• The effort is applied close to the pivot

How do gears multiply the turning effect of the engine?

• By increasing the size of the force applied

• By using gears of equal size

• By having gears of different radii that rotate together

What does a wheel and axle system demonstrate?

• A type of pulley used in transport

• A simple gear system used to investigate mechanical advantage

• A way to transfer heat through friction

When comparing the radii of a wheel and an axle, how can you determine mechanical advantage?

• By subtracting the axle radius from the wheel radius

• By comparing the diameter to the load

• By calculating the ratio of wheel radius to axle radius