Work & Mechanical Advantage
What is the formula for work?
Work = Force × Distance
What is an inclined plane?
A flat, slanted surface (like a ramp)
Name the three classes of levers.
1st, 2nd, and 3rd class
What is the formula for pressure?
Pressure = Force ÷ Area
What is a compound machine?
A device made of 2+ simple machines
What is the unit for work?
Joules (J)
Give an example of a wedge.
Axe, knife, chisel
What class of lever is a seesaw?
1st class
What is the unit for pressure?
Pascals (Pa)
Give an example of a compound machine.
Bike, car jack, scissors
What is mechanical advantage (MA)?
How much a machine multiplies force
What’s the main difference between a screw and an inclined plane?
A screw is a twisted inclined plane
What’s the difference between a fixed and moveable pulley?
Fixed changes direction; moveable reduces effort
What does Pascal’s Law state?
Pressure is evenly distributed in a fluid
Why do we combine simple machines?
To increase efficiency and reduce effort
How do you calculate MA?
MA = Load Force ÷ Effort Force
How does increasing the length of an inclined plane affect MA?
Increases MA (makes work easier)
What is a block and tackle?
A system of multiple pulleys used together
What is a hydraulic system?
Uses liquids to transmit force
How has machine design changed over time?
More efficient, more automated, less human effort
If you use 10 N to lift a 50 N object, what is the MA?
MA = 50 ÷ 10 = 5
What is a wheel and axle?
A large wheel attached to a small axle that rotate together
Which lever class has the effort in the middle?
3rd class (like a broom or hockey stick)
What is a pneumatic system?
Uses gases (like air) to transmit force
What happens to MA when machines are combined?
It can increase, making work easier