Applied Physics and Chemistry Work Lecture 4

Slides:

Advertisements

Similar presentations

Simple Machines.

Advertisements

What do simple machines do for us anyway?

Designing Simple Machines Using Mechanical and Ideal Mechanical Advantage.

Work, Power, and Machines

Simple Machines.

Simple Machines Physical Science Georgia Performance Standards:

Bellwork A box of San Francisco 49ers jerseys is pushed with 80 Newtons of force for 5 meters up a ramp into a truck with a height of 1 meter to be taken.

1. How is torque calculated?. Torque = Force X length of torque arm T = F x l.

Work, Power, and Simple Machines

Simple Machines: More Practice. Inclined Plane Simple Machines: More Practice.

Simple Machines Mechanical Advantage. Ideal Mechanical Advantage:  Is the mechanical advantage of an “ideal machine”  Theoretical value  The IMA for.

Mechanical Advantage and Efficiency

1 Simple Machines 2 Types of Simple Machines: lever gear ramp wheel pulley.

Calculating Mechanical Advantage Inclined Plane, Pulley, Lever.

Ch. 5 Simple Machines.

MACHINES and EFFICIENCY Chapter Key Terms Work = Force x distance Simple machine ◦ a device used to multiply forces or change the direction of.

Mechanical Advantage & Efficiency.

Simple Machines.

Work, Power and Machines

Section 10.2 Machines Objectives

Chapter 6 Simple Machines Simple Machines. Simple Machines Wedge Wedge Cam Cam Screw Screw Lever Lever Pulley Pulley Wheel & Axle Wheel & Axle Hydraulic.

Mechanical Advantage.

Ch. 5 – Work & Machines I. Work Exerting a force over a certain distance;a form of energy(SI units = Joules)A. Work: 1. For work to be done an object must.

Simple Machines.

Work, Power, and Simple Machines

Modern Technology uses Compound Machines

Mechanical Advantage and Efficiency

Simple Machines.

Simple Machines. I. The simple machine A. Types of Simple Machines… 1. Lever 2. Pulley 3. Wheel and axle 4. Screw 5. Wedge 6. Inclined plane.

Machines Section 10.2 Physics. Objectives Demonstrate knowledge of why simple machines are useful. Communicate an understanding of mechanical advantage.

Wedge Inclined Plane Screw Wheel and Axle Lever Pulley.

MACHINES and EFFICIENCY

Mechanical Advantage What do simple machines do for us anyway?

Mechanical Advantage of the 6 Simple Machines. Content Objectives SWBAT calculate mechanical advantage for the six simple machines. Language Objectives.

Mechanical Advantage The measurement of how useful a machine is to the job.

Work Work: using a force for a distance W = F x d

Topic 9 Simple Machines.

Work, Machines, and Energy. Work and Power  Work is done if (1) an object moves, and (2) if a force acts in the same direction that the object moves.

Simple Machines There are 6 basic simple machines.

Ch 14 Work, Power, and Machines. Work – transfer of energy through motion a. Force must be exerted through a distance Ch 14 WORK AND POWER.

Define the following terms A. Work B. Power C. Machine S-34.

Work and Machines. What is a machine? A device that allows you to do work in a way that is easier and more effective.

Work, Machines, and Energy

Machines. Simple Machines  Work out is less than or equal to Work in.  Force out can be greater than Force in.

Physical Science Chapter 14 Review Game. Work and Power EfficiencyMachines Mechanical Advantage 1 point 1 point 1 point 1 point 1 point 1 point 1 point.

Work, Power, and Simple Machines

Simple Machines & Mechanical Advantage

INCLINE PLANE FAMILY Inclined planes multiply and redirect force.

Machines, Mechanical Advantage, and Efficiency. Ideal Machines In an ideal machine, work going in is equal to the work going out, this means it has 100%

Mechanical Advantage and Efficiency

Simple Machines W O R K M e c h a n i c a l A d v a n t a g e Force Effort E f f i c i e n c y 1.

Work, Power, and Machines Physical Science. What is Work? Transfer of Energy Occurs when a force makes an object move a distance.

Starter Directions: Match the units on the right with the correct measurement on the left. 1. F = __________________ 125 kilograms 2. m = _________________23.

Chapter 11 work and machines. Anytime that you exert a force and cause an object to move in the direction of the applied force you do _________. work.

Chapter 15 Machines What is a simple machine? People use machines to make work easier They allow a person to -change the size of the force -change.

Simple Machines LeversPulleys Inclined Plane Simple Machines Can multiply or change the direction of an applied force.

Simple Machines Mechanical Advantage WORK 1 Efficiency Effort Force

Efficiency and Simple Machines

14.3 Mechanical Advantage and Efficiency

Mechanical Advantage and Efficiency

MACHINES and EFFICIENCY

Simple Machine Quiz Review

Work and Power.

Chapter 8 Rotational Equilibrium and Dynamics

Simple Machines.

Work, power, and machines

Simple Machines.

Chapter 14-3 Notes Name: ___________________

Simple Machines: More Practice

Presentation transcript:

Applied Physics and Chemistry Work Lecture 4 Efficiency and MA Applied Physics and Chemistry Work Lecture 4

Mechanical Advantage Mechanical advantage tells how much the machine is helping us Two ways to calculate MA: IMA: Ideal Mechanical Advantage Neglects the effect of friction IMA = de/dr AMA: Actual Mechanical Advantage Includes the effect of friction MA = Fr/Fe

MA Problems You got roped into helping your parents’ friends move. They have a ramp leading up into the back of a truck. The ramp is 6 m long, and the back of the truck is 1.5 m off the ground. What is the MA of this simple machine? When watching a circus act, you notice the tumblers using a first class lever and wonder how if one of them jumps, it can propel two of them into the air. When the tumbling lever is measured, it shows the effort arm (which they jump on) is 8 meters long, the resistance arm (where their tumbler is being propelled from) is 2 meters long. What is the mechanical advantage of this lever?

More MA Problems A toy car has the following measurements for its wheels: the radius axle (the small wheel) measures 1 cm. The radius of the larger wheel (the one that touches the pavement) measures a whopping 10cm. What is the mechanical advantage of these large wheels? A 10 m ramp is used to lift a 600 N box to a height of 2 m. The effort force as a person pushes the box up the ramp is 160 N. What is the AMA of this simple machine? What is the IMA of the ramp?

Efficiency In a real machine, not all input work is available as output work Efficiency is the ratio of output work to input work Eff = (Wo/Wi) x 100 Eff = (MA/IMA) x 100

Efficiency Problems A 10 m ramp is used to lift a 600 N box to a height of 2 m. The effort force as a person pushes the box up the ramp is 160 N. What is the efficiency of this simple machine? A worker uses a pulley system to raise a 24 kg carton 16.5 m. A force of 129 N is exerted and the rope is pulled 33 m. What is the efficiency of the system?