week5-2 - If work is done but no kinetic energy is gained,...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Potential Energy If work is done but no kinetic energy is gained, we say that the potential energy has increased. For example, if a force is applied to lift a crate, the gravitational potential energy of the crate has increased. The work done is equal to the force (mg) times the distance lifted (height). The gravitational potential energy equals mg X h. potential energy implies storing energy to use later for other purposes. For example, the gravitational potential energy of the crate can be converted to kinetic energy and used for other purposes After releasing the string, it reach the ground with higher speed, i.e. large kinetic energy, if it’s positioned higher, i.e. higher potential energy at the beginning.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2/5/2012 2 5.0 kg box lifted (without acceleration) thru height of 2.0 m What is increase in potential energy and how much work I Is needed ? Ch 6 E 8 A). 5000 J, 5000 J B). 490 J, 490 J C). 98 J, 98 J D). 196 J, 196 J E). 49 J, 49 J
Background image of page 2
2/5/2012 3 Conversion Between Potential and Kinetic energy If we raise an object a height h so that it starts and finishes at rest then the average force = mg and the work done = mgh . This energy is stored as potential energy. if the mass is allowed to fall back to it’s
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/13/2012 for the course PHYS 214 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

Page1 / 14

week5-2 - If work is done but no kinetic energy is gained,...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online