What does the Law of Conservation of Energy state in relation to machines?

• Machines increase the amount of work output
• Work input equals work output
• Machines decrease the amount of work input
• Work output is always greater than work input

Which of the following is NOT a way machines can change force?

• Change the distance
• Change the direction
• Change the size
• Change the mass

What is the definition of mechanical advantage?

• The amount of work a machine can do
• The energy output of a machine
• The number of times a machine multiplies your effort force
• The efficiency of a machine

In the formula MA = FR / FE, what does FR represent?

• Friction Resistance
• Force Ratio
• Resistance Force
• Relative Force

Which formula for mechanical advantage uses distances instead of forces?

• MA = FR / FE
• MA = DE / DR
• MA = FE × DR
• MA = FR × DE

What are the units for Mechanical Advantage?

• Newtons
• Meters
• Joules
• There are no units

If the resistance force is 100N and the effort force is 25N, what is the mechanical advantage?

• 0.25
• 2
• 4
• 125

In a lever system, if the effort arm is 60 cm and the resistance arm is 15 cm, what is the mechanical advantage?

• 0.25
• 2
• 4
• 75

Which class of lever typically has the lowest mechanical advantage?

• First class
• Second class
• Third class
• All classes have equal mechanical advantage

How do you determine the mechanical advantage of a pulley system?

• Count the number of pulleys
• Measure the length of the rope
• Count the number of support strings
• Divide the effort force by the resistance force