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ENERGY = THE ABILITY TO DO WORK
WORK = ENERGY TRANSFERRED

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Product of force parallel to movement and the displacement of a body

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When is W positive?

When is W negative?

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Physics, Positive Work vs. Negative Work for Horizontal Motion

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Work done by forces in different directions

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Work done by forces in different directions

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Work example problems | Work and energy | Physics | Khan Academy

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Is work done on a tray that is carried by a waiter moving at constant speed?

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Is work done on a tray that is carried by a waiter moving at constant speed?

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NO.
The force applied on the tray is vertically upwards to overcome the force of gravity on the tray, and there is no part (component) of that force that acts in the same direction as the displacement horizontally.

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Physics - Mechanics: Work, Energy, and Power (10 of 20) Work Done by Carrying a Box

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Law of conservation of Energy

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The Power of a Waterfall | Wonders of Life w/ Prof Brian Cox | BBC Earth

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Principle of Conservation of Mechanical Energy states:
In the absence of external forces, the total mechanical energy in a system is CONSTANT.

Def for mechanical energy:
Mechanical energy is the sum of gravitational potential energy and kinetic energy at a point.

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E mech of a Roller Coaster Ride

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Potential And Kinetic Energy V2: Physics Concept Trailer™

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Answers p. 13-16

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Def:
Work done by a net force on an object is equal to the change in its kinetic energy.

W net = ΔE k

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Physics, Work Energy Theorem, An Explanation

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Work done by forces acting on inclined plane

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Work done by forces acting on inclined plane

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Physics - Mechanics: Work, Energy, and Power (7 of 20) Inclined Plane (Friction)

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Physics - Mechanics: Work, Energy, and Power Examples (27 of 27) % Work Lost Due to Friction

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Answers p.19-43 NOTES

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Power | Work and energy | Physics | Khan Academy

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📚 How to solve any percent efficiency problem

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Answers Power