Formulas Symbols and Units Levers Wheel and Axle

Formulas Symbols and Units Levers Wheel and Axle Under Pressure Hodge Podge 100 100 100 200 200 200 300 300 300 400 400 400 500 500 500

This formula calculates the amount of work done by a simple machine

Multiply force by the distance moved W=F x D

What is the formula for “Pressure”?

P= F (force) A ( Area)

What is the formula for Mechanical Advantage if you are give force (N) or mass?

M. A = Load Force Effort force

What is the formula for Mechanical Advantage if you are given the measurement (m)?

M. A = Effort Arm Load Arm

How do you determine the Mechanical Advantage of a Pulley system?

The Mechanical Advantage of a pulley system is EQUAL to the number of supporting ropes off of the moveable pulley.

What is the correct unit for Pressure?

N/m 2 Newtons per meter squared

What is the symbol and unit for the Pascal?

Pa and N/m 2

Work is calculated in this.

J -- Joules

Force is measured in….

What are Newtons (N)

These units are used in Mechanical Advantage

There are no units used in Mehcanical Advantage – it is a RATIO.

THis class or classes of levers exert a LOAD force greater that the EFFORT force?

What are Class 1 levers? What are Class 2 levers?

These types of levers can give a M. A. that is greater than 1 if the Load Arm (LA) is shorter than the Effort Arm (EA).

What are Class 1 and 2 levers?

If the Load Arm (LA) and Effort Arm (EA) are EQUAL in Class 1 and 2 levers they have this type of M. A.

What is M. A of 1?

This type of lever is built for speed and has a Mechanical Advantage of LESS than 1.

What is a Third Class Lever?

This type of lever requires a large force over a small distance.

What is a third class lever?

This is the formula to determine the speed ratio in gears.

What is: Speed Ratio= Number of driver gear teeth Number of follower gear teeth

In a winch the radius of the wheel is also considered the

What is Load Arm?

You get this type of advantage in a wheel and axle when the Effort Arm is longer than the load arm

What is force advantage?

What is the speed ratio if your Driving Gear has 60 teeth and your Following gear has 6 teeth?

What is 10?

This is a very complex pulley system in a combination of fixed and moveable pulleys

What is a Block and Tackle?

This Law states: Pressure exerted on a contained fluid is transmitted undiminished in all directions in the fluid and perpendicular to the walls of the container

What is Pascal’s Law?

What are some examples of equipment to spread force over a large area?

What are seat belts, air bags, helmets, shoulder pads etc.

This formula helps determine the Mechanical Advantage in a hydraulic jack.

What is M. A. = Output Force Input Force

Why is there such a large M. A?

Every square unit receives the same amount of force. The output piston has many more square units of area; therefore, it receives MORE force!

What is the M. A. of a hydraulic lift if the Load was 2000 N and the Effort force was 100?

M. A = 2000 = 20 100

This is the “Work Output by a machine divided by the Work Input x 100%

What is efficiency?

When doing work, this type of slanted surface reduces the force you need to exert on something.

What is a Inclined Plane?

When bouncing a ball – it is at this point that you will find it’s maximum potential energy.

What is the top or highest height the ball reaches?

Name three examples where friction is useful

Answer will vary, rosin baseball, brakes on a bike, etc.

Every time you squeeze your toothpaste you are applying this law.

What is Pascal’s Law?