Show:
Levers 1
Levers 2
MA 1
Lever 3
Lever 4
100
How many classes of levers are there?
3
100
What kind of lever has a fulcrum, resistance arm, and effort arm?
First-class lever, second-class lever, and third-class lever.
100
What is mechanical advantage?
The number of times a machine multiplies your effort force is called the mechanical advantage.
100
What kind of lever has the fulcrum between the effort arm and the resistance arm?
First-class lever
100
What kind of lever has the effort between the fulcrum and the resistance?
Third-class lever.
200
Formula for work output
work output = Fr x Dr
200
Formula for work input.
work input = Fe x De
200
What is the formula for mechanical advantage?
Mechanical advantage = resistance force/effort force = Fr/Fe
300
Tyler uses a lever to lift a crate. He applies 100 newtons of effort force. He pushes the lever 2.0 meters. What is the work input?
work input = effort force x effort distance = Fe x De = 100 newtons x 2.0 meters = 200 joules
300
A lever exerts 100 newtons of resistance force. It lifts a box only 0.5 meters. What is the work output?
work output = resistance force x resistance distance = Fr x Dr = 100 newtons x 0.5 meters = 50 joules
300
A man lifts a resistance that weighs 40 newtons when he applies an effort force of 20 newtons. What is the machine's mechanical advantage?
MA = resistance force/effort force = 40 newtons/20 newtons = 2
400
Blanca uses a lever to lift a heavy box. She applies 200 newtons of effort force and pushes the end of the lever 0.5 meters. What is the work input?
work input = effort force x effort distance = 200 newtons x 0.5 meters = 100 joules.
400
Blanca uses a lever to lift a heavy box. The lever exerts 250 newtons of resistance force. It lifts the box 0.2 meters. What is the work output?
work output = resistance force x resistance distance = 250 newtons x 0.2 meters = 50 joules
400
What is the mechanical advantage of a simple machine if a force of 25 newtons lifts an object weighing 50 newtons?
MA = 50 newtons/25 newtons = 2
500
Matthew uses a lever to lift a bunch of bricks. His work output was 50 joules and his work input was 100 joules. What is the efficiency of the lever?
efficiency = work output/work input x 100% = 50/100 x 100% = 50%
500
All levers have what three things?
Fulcrum, resistance arm, and effort arm.
500
What is the mechanical advantage of a simple machine if a force of 15 newtons lifts an object weighing 75 newtons?
MA = 75 newtons/15 newtons = 5