M2.2 Work and Machines

Which of the following is NOT a simple mechanical advantage device?

• Lever

• Pulley

• Gear

• Computer

What is a lever?

• A rigid bar that turns about a fixed axis

• A flexible rope used to lift objects

• A wheel that rotates on an axle

• A flat surface inclined at an angle

What happens when you increase the distance from the applied effort to the fulcrum in a first-class lever?

• Increases the mechanical advantage

• Decreases the mechanical advantage

• Has no effect

• Reverses the mechanical advantage

Which of the following is NOT an example of a first-class lever?

• Crowbar

• Claw hammer

• Pliers

• Bicycle

What is the formula used to calculate the effort required to lift a weight using a lever?

• E × L = R × l

• E + L = R + l

• E - L = R - l

• E / L = R / l

What is the relationship between effort and resistance in a first class lever?

• They are always equal

• They act in the same direction

• They act in opposite directions

• They do not affect each other

What is the relationship used to calculate a second-class lever?

• Same as a first-class lever EL = Fl

• Different from a first-class lever

• Opposite of a first-class lever

• No relationship

What type of lever is a wheelbarrow?

• First-class lever

• Second-class lever

• Third-class lever

• Fourth-class lever

What is the position of the fulcrum in a third-class lever?

• At the end

• In the middle

• At the resistance

• At the effort

What is the unit of measurement for effort in the inclined plane formula?

• Meters

• Newtons

• Kilograms

• Liters