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Physics – 8.4 notes

Simple Machines. Physics – 8.4 notes. I. The simple machine. Types of Simple Machines… Lever Pulley Wheel and axle Screw Wedge Inclined plane. Any device that transmits or modifies force. Def – Table 8-6 pg. 298 Using Simple Machines

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Physics – 8.4 notes

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  1. Simple Machines Physics – 8.4 notes

  2. I. The simple machine • Types of Simple Machines… • Lever • Pulley • Wheel and axle • Screw • Wedge • Inclined plane

  3. Any device that transmits or modifies force • Def – • Table 8-6 pg. 298 • Using Simple Machines 1. Mechanical Advantage – ratio of forceout compared to forcein a. 2. MA – ratio of distancein compared to distanceout a.

  4. 3. Ex: A carpenter uses a claw hammer to pull a nail from a board. The nail has a resistance of 2500 N. The carpenter applies a force of 125 N. What is the mechanical advantage of the hammer? 4. Ex: A 3.75 meter long ramp is used to get a 1000 N sofa onto the back of a 1.25 meter high trailer. What is the ideal mechanical advantage of the ramp? 20.0 MA 3 .oo MA

  5. What machines can do… 1. alter force and distance MA > 1  force in reduces, but…  distance increases MA < 1  force in increases, but…  distance decreases

  6. How much input energy is lost compared to how much energy is used to perform work on an object. • Efficiency (real machines) 1. Def – 2. a. 100% efficient??? 3. Ex: A sofa weighing 1000 N must be placed in a truck bed 1.2 m off of the ground. A worker uses a force of 500 N to push the sofa up the inclined plane that has a slope of 3.5 m. What is the efficiency of the inclined plane? 70% Efficient

  7. Physics Assignment • The efficiency of a squeaky pulley system is 73%. The pulleys are used to raise a mass to a certain height. What force is exerted on the machine of a rope is pulled 18.0 m in order to raise a 58 kg mass a height of 3.0 m? • A person lifts a 950 N box by pushing it up an incline. If the person exerts a force of 350 N along the incline, what is the MA of the incline?

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