What is the fixed point around which a lever rotates called?
Fulcrum
Order the steps in how a lever works based on the principle of moments:
1️⃣ Apply a small force far from the fulcrum
2️⃣ Create a large moment around the fulcrum
3️⃣ Move a larger load closer to the fulcrum
The principle of moments states that for a lever to be in equilibrium, the moment on one side of the fulcrum must equal the moment on the other side
Match the lever type with an example:
First Class ↔️ Crowbar
Second Class ↔️ Wheelbarrow
Third Class ↔️ Tweezers
What are gears used to transmit in rotational motion?
Speed, torque, direction
A moment is calculated as force multiplied by distance from the fulcrum.
True
What force is required to lift a 1000 N load using a wheelbarrow with a mechanical advantage of 2?
500 N
A lever provides a mechanical advantage by allowing a small force to exert a larger force at a different point
Which type of lever has the fulcrum between the force and the load?
First Class
In a second-class lever, where is the load positioned relative to the fulcrum and the force?
Between fulcrum and force
Moment is calculated as force multiplied by the distance from the fulcrum
The gear ratio is the ratio of the number of teeth on the driver gear to the number of teeth on the driven gear
The gear ratio determines the mechanical advantage provided by the gear system.
The mechanical advantage of a lever depends on the position of the fulcrum relative to the force and load.
True
In equilibrium, the product of force and distance on one side of the fulcrum equals the product of force and distance on the other side.
True
What determines the mechanical advantage of gears?
Gear ratio
A gear ratio greater than 1 increases torque but decreases speed.
True
What happens to the torque when the gear ratio is greater than 1?
Increases
The mechanical advantage of gears is the ratio of the output torque to the input torque
What is the mechanical advantage of a gear system with a driven gear of 60 teeth and a driver gear of 30 teeth?
2
Which type of lever has the load between the fulcrum and the force?
Second class
Match the lever type with its fulcrum position:
First Class ↔️ Between force and load
Second Class ↔️ Load between fulcrum and force
Third Class ↔️ Force between fulcrum and load
What is the fixed point around which a lever rotates called?
Fulcrum
What is the mechanical advantage of a third-class lever?
Always less than 1
The three main types of levers are defined by the position of the fulcrum
What can gears provide a mechanical advantage to increase?
Force or speed
Match the type of lever with its fulcrum position:
First Class ↔️ Between force and load
Second Class ↔️ Load between fulcrum and force
Third Class ↔️ Force between fulcrum and load
The principle of moments states that for an object in equilibrium, the total clockwise moment must equal the total anticlockwise moment around the same point.
Third class levers reduce the applied force but increase the speed.
True
What is the formula for calculating the gear ratio?
(Driver teeth) / (Driven teeth)
The formula for the gear ratio is: Gear Ratio = (Number of teeth on driver gear) / (Number of teeth on driven gear)
What is the gear ratio if the driver gear has 36 teeth and the driven gear has 12 teeth?
3
Match the gear ratio with its effect on torque:
> 1 ↔️ Increases
< 1 ↔️ Decreases
= 1 ↔️ Remains the same
Where is the fulcrum located in a first-class lever?
Between force and load
A gear ratio greater than 1 increases torque and decreases speed.
True
Gears are used in bicycles, clocks, and car transmissions
A wheelbarrow is an example of a second-class lever
The principle of moments states that the total clockwise moment must equal the total counterclockwise moment for equilibrium.
True
The principle of moments states that for equilibrium, the total clockwise moment must equal the total anticlockwise moment
The mechanical advantage of a lever depends on the fulcrum position.