Physics: Work. Conservation of energy (1)

Physics: Kinetic energy. Work. Gravitational potential energy. Total mechanical energy. Conservation of mechanical energy. Spring potential energy. Conservation of energy problems

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(1) Kinetic energy. Work
(2) Continued. Gravitational potential energy. Total mechanical energy. Conservation of mechanical energy
(3) A conservation of energy problem
(4) Continued
(5) Another conservation of energy problem
(6) Continued
(7) Spring potential energy. A spring problem
(8) Continued

Category:

Education

Tags:

• physics
• kinetic
• energy
• work
• gravitational
• potential
• total
• mechanical
• conservation
• of
• spring
• problems

[hussansohaib]

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[sarah29172]

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[Clipster15]

You state that a perpendicular force to its motion does no work which makes sense by the definition of work. But if the force is originally perpendicular and causes a change in direction, then the moment after that, it is no longer perpendicular to the motion and does do work. Correct? The only way that no work is done continuously is if the force is kept perpendicular to the motion (e.g a circle path) or the particle/mass resists the perpendicular force, right?

[NDGirl1100]

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[malimalinche1]

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[Elricky124]

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[DTechEdu]

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[WongeneKIM]

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[MedicalSchoolFinder]

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[sameerxD]

at 4:10, when he works with force and velocity vectors, those speed up, slow down, and change direction, really define sign of work. If the vectors are in the same direction, work is positive. if vectors are in the opposite direction, it's negative. if they're perpendicular, W = 0. It's called the vector dot product, basically, | F | x | delta r | x cos (angle between the vectors). Cos(0) = 1, cos(180) = -1, Cos(90) = 0.