Forces: Moments, Levers & Gears

What is the formula for calculating moment?

• Speed x Time

• Force x Distance

• Mass x Acceleration

• Volume x Density

In a lever system, where is the effort applied?

• On the opposite side of the lever

• On one end of the lever

• On the middle of the lever

• On both ends of the lever

What type of lever has the load between the fulcrum and the effort?

• Third-class lever

• First-class lever

• Second-class lever

• Fourth-class lever

Fill in the blank: Gears are used to transmit ________ from one part of a machine to another.

• motion or power

• heat or light

• energy or force

• sound or pressure

What is the principle behind a wheelbarrow being a simple machine?

• Lever principle

• Screw principle

• Pulley principle

• Inclined plane principle

Which type of lever has the effort between the fulcrum and the load?

• Fourth-class lever

• Third-class lever

• First-class lever

• Second-class lever

Explain how gears can change the direction of motion.

• Gears change the direction of motion by altering the gravitational pull on the objects they are connected to.

• Gears change the direction of motion by interlocking teeth that push against each other, causing the second gear to rotate in the opposite direction.

• Gears change the direction of motion by using magnets to repel each other.

• Gears change the direction of motion by emitting a force field that reverses the rotation.

What is the SI unit of moment?

• Newton meter (N*m)

• Kilogram meter per second squared

• Joule per second

• Watt per second

In a lever system, what is the pivot point called?

• fulcrum

• axis

• balance point

• center

What is the mechanical advantage of a lever with a load of 100N and an effort of 50N?

• 1.5

• 3

• 2

• 4