Work, power and machines with pitucres
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The document defines work as energy transferred by a force causing movement, with the formula W=Fxd. Power is the rate of work over time, with the formula P=W/t. Machines make work easier by changing the amount or direction of force, classified as simple machines like levers, pulleys, wheels and axles, inclined planes, wedges, screws, or compound machines combining simple machines. Mechanical advantage is the number of times a machine multiplies force, while efficiency is the ratio of work output to input accounting for energy lost to friction.
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Work and machines
The document defines work as energy transferred by a force that causes an object to move, provides the formula for work (W=Fxd), and defines the units of measurement. It then defines power as the rate at which work is done, providing the formula (P=W/t) and units. Finally, it describes different types of simple machines - lever, pulley, wheel and axle, inclined plane, wedge, screw - that make work easier by changing the amount of force or distance required. A compound machine uses more than one simple machine.
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This document defines and provides examples of work, power, and simple machines. It explains that work is force applied over a distance, and defines the units of work as joules. Power is defined as the rate of work over time, with units of watts. Simple machines are then described in detail, including inclined planes, wedges, screws, levers, pulleys, and wheel and axles. Their input/output mechanical advantages are also defined. Compound machines are noted as combinations of two or more simple machines.
5.1 Notes
Work is defined as forces acting on objects over a distance. It is measured in joules or newton-meters. Power is the rate at which work is done and is measured in watts or horsepower. Efficiency calculates how well a machine transfers energy and is the ratio of work output to work input. The most efficient machine is the bicycle at 95% while the human body has an efficiency of only 8%.
Chapter 14 work and power power point kremkus
1) Machines make work easier by changing the size, direction, or distance over which a force acts.
2) There are six simple machines: lever, wheel and axle, inclined plane, wedge, screw, and pulley.
3) Levers, inclined planes, wedges, and screws can increase the mechanical advantage of a force. The mechanical advantage of pulleys depends on the number of rope sections supporting the load.
Work Machines
1. Work is done when a force causes an object to move a distance. A machine makes work easier by multiplying force, distance, or changing the direction of force.
2. The mechanical advantage of a machine is the ratio of its output force to input force. It indicates how much a machine multiplies the input force. Mechanical efficiency compares the machine's output work to its input work.
3. Common simple machines that multiply force include inclined planes, screws, levers, wheel and axles, and pulleys. Compound machines combine two or more simple machines.
General science unit 4 simple machines
This document provides an overview of a science unit on simple machines. It covers definitions of work, power, and energy. Key concepts explained include how machines make work easier by changing the amount of force, distance, or direction of force. Mechanical advantage and efficiency of machines are also defined. Machines allow less input force and distance to produce greater output force and distance, keeping the total work the same.
Work & Power
Work is defined as the transfer of energy when a force causes an object to move. Power is the rate at which work is done and is calculated by dividing the work by the time taken. Machines make work easier by changing the direction or magnitude of the applied force, allowing tasks to be completed with less exertion. They do not reduce the total amount of work done.
ECGS Module 4B
This document discusses the six types of simple machines: inclined plane, wedge, lever, pulley, wheel and axle, and screw. It provides definitions and examples of each machine, as well as explaining how to calculate their mechanical advantages. The key functions of simple machines are to make work easier by magnifying or changing the direction and amount of applied force.
Simple machines - intro
Simple machines reduce effort, change the point and direction of applied effort, and can produce a gain in speed. They include levers, pulleys, wheels and axles, inclined planes, screws, and wedges. Simple machines work by transferring mechanical advantage, defined as the load divided by the effort. A mechanical advantage over 1 reduces effort but increases force (force multiplier), under 1 increases speed but decreases force. An advantage of 1 merely changes the direction of effort. Velocity ratio and efficiency are also defined.
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Work, power and machines with pitucres
- 1. Work • Work is energy transferred that causes the object to move in the direction of the force — no movement, no work. • Formula for work: W = F x d • Units: – Work – joule (J) – Force – newton (N) – Distance – meter (m)
- 2. Power • Power is the rate at which work is done • (determines work over time) • Formula: P = W/t • Units: – Power – watt (W) – Work – joule (J) – Time – seconds
- 3. Machines • Machine – device that makes work easier by changing the amount of force (effort) or direction of the force • Changing force (effort) is mechanical advantage • Machines let you swap force for distance or distance for force….you still do the same amount of work
- 4. Levers – move from a fixed point
- 5. Pulleys – grooved wheel that holds rope or cable
- 6. Wheel and axle – 2 circular objects of different sizes (wheel is larger)
- 7. Inclined plane – straight slanted surface
- 8. Wedge – two inclined planes that move
- 9. Screw – inclined plane wrapped around a cylinder
- 10. Compound machine – made of more than one simple machine
- 11. • Mechanical advantage – number of times a machine multiples force • Work output – work done by the machine; product of output force and the distance of the force applied • Work input – work done on a machine; product of the input force and the distance of the force applied • Mechanical efficiency – ratio of output to input of energy or power (divide output by input)
- 12. • Due to friction, work put into a machine is always greater than the work output by the machine.