prez: simple machines, mechanical advantage, & work

Simple Machines

Multiple Choice

Based on the definition of work and the examples provided, which scenario does NOT involve work being done?

• Lifting a bag and walking forward

• Standing still while holding a weight

• Pushing a box across the floor

• Swinging a golf club

Multiple Choice

Which formula is used to calculate work in physics?

• W = Fd

• W = F + d

• W = F/d

• W = d/F

Multiple Choice

A 900 N mountain climber scales a 100m cliff. How much work is done by the mountain climber?

• 90,000 J

• 900 J

• 9,000 J

• 100,000 J

Multiple Choice

Kenley does 15 Joules of work to throw a pencil across the room 2 meters. How much force did she use?

• 7.5 N

• 30 N

• 13 N

• 17 N

Multiple Choice

Which of the following best describes the difference between input force and output force in a simple machine?

• Input force is the force applied by a machine, output force is the effort force.

• Input force is the effort force applied to a machine, output force is the load or resistance.

• Input force is always greater than output force, output force is always less.

• Input force is the resistance, output force is the effort.

Multiple Select

Which of the following are formulas used to calculate mechanical advantage?

• MA = de/dr

• MA = fr/fe

• MA = fe/fr

• MA = dr/de

Multiple Choice

If the mechanical advantage of a machine is less than 1, what does this indicate?

• The effort force is greater than the resistance force.

• The effort distance is greater than the resistance distance.

• The machine is perfectly efficient.

• The mechanical advantage can be zero.

Multiple Choice

Which of the following is NOT one of the six types of simple machines?

• Inclined plane

• Lever

• Pulley

• Motor

Multiple Choice

Which of the following is a Class 2 lever?

• Scissors

• Wheelbarrow

• Broom

• Fishing rod

Multiple Choice

The lower the number of ropes, the higher the mechanical advantage when using pulleys.

• true

• false

Multiple Choice

Which type of pulley system provides the greatest mechanical advantage?

• Fixed pulley

• Moveable pulley

• Combined pulley

• Single rope pulley

Multiple Choice

How do you calculate the mechanical advantage of a wheel and axle?

• Multiply the radius of the wheel by the radius of the axle

• Divide the radius of the wheel by the radius of the axle

• Subtract the radius of the axle from the radius of the wheel

• Add the radius of the wheel and axle

Multiple Choice

If a wheel has a diameter of 10 inches and its axle has a diameter of 2 inches, what is the mechanical advantage (MA) of the wheel and axle system?

• 2

• 5

• 10

• 20