Simple Machines Day 2

What can simple machines do?

• Multiply a force

• Increase how much energy a force transfers

• Change a force's direction

• Create a force out of nothing

Which of these is a class 1 lever?

• Effort on left, load in middle, fulcrum on right

• Load on left, fulcrum in middle, effort on right

• Effort and load on same point, fulcrum to the right

• Load on fulcrum, effort to the left

A lever has a load distance of 5 m, load force of 10 N, and effort distance of 2 m. What effort force is needed?

• 1 N

• 100 N

• 25 N

• 50 N

Conservation of energy can be used to show that:

• If a force is increased, the distance it acts over is decreased.

• Simple machines cannot exist in the real world.

• IMA = F_out / F_in

• IMA = D_in / D_out

If Earth weighs 5.972 x 10²⁴ kg and is 1 m from the fulcrum of a lever, what force is needed 7.296 x 10²² m away from the fulcrum?

• 802 N

• Too many newtons

• 12942 N

• 24921 N

True or False: Work is not a source of energy.

• True

• False

The force of gravity is also known as:

• Friction force

• Work

• Electrostatic force

• Weight force

A faucet handle can be modeled as a wheel and axle. If the rod of a faucet handle has a diameter of 1 cm and the IMA of the machine is 6, what is the radius of the handle?

• 0.08 cm

• 0.17 cm

• 3.0 cm

• 6.0 cm

A wheel and axle is very similar to a lever, only:

• A wheel and axle has a different formula for IMA.

• A wheel and axle's fulcrum is always in the center.

• A lever does not rotate.

• Wheel and axles have different classes.

A screwdriver (wheel and axle) has an inner radius of 2 cm and handle diameter of 6 cm. What is its IMA?

• 2.5

• 5

• 3

• 1.5