Levers Notes

What is a lever?

• A simple pulley

• A type of machine

• A type of screw

• A rigid rod that rotates around one point to move a load

Who worked out how things balance?

• Newton

• Einstein

• Archimedes

• Galileo

What occurs when moments are equal and opposite?

• Acceleration

• Friction

• Balance

• Motion

What is the Law of the Lever?

• F1+F2 = D1+D2

• F1D1 = F2D2

• F1/F2 = D1/D2

• F1D2 = F2D1

What is an example of a first-class lever?

• Wheelbarrow

• Seesaw

• Bottle opener

• Tweezers

What happens when the effort moves farther than the load in a first-class lever?

• Mechanical advantage > 1

• Mechanical advantage < 1

• Mechanical advantage = 1

• Mechanical advantage = 0

What is the mechanical advantage of a lever where the effort force is 10N, D1 = 50cm, and D2 = 10cm?

• 5

• 10

• 1

• 0.2

Which class of lever always multiplies a force?

• Third class

• None of the above

• Second class

• First class

What is true about third class levers?

• They always have a mechanical advantage greater than 1

• The effort is applied between the output load and the fulcrum

• They do not multiply force

• The load is always closer to the fulcrum than the effort

What does a mechanical advantage greater than 1 mean?

• The input force will be greater than the output force

• The output force will be greater than the input force

• The lever will break

• The lever will not move