lecture 10

lecture 10 - 1 Lecture 10 Work and Energy The scalar...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

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

Unformatted text preview: 1 Lecture 10 Work and Energy The scalar product Kinetic energy The work-energy theorem 2 Energy is a scalar quantity that is associated with a state (or condition) of an object. Kinetic energy is associated with an objects state of motion. Potential energy is associated with an objects position (or configuration). 3 Work is the amount of energy transferred to or from an object by means of a force acting on it. If W >0 then energy is added If W < 0 then energy is removed The unit of work and energy is the joule (J). 1 J = 1 Nm = 1 kg m 2 /s 2 . 4 It is only the force in the direction of the displacement that does work. = = r F d W work B A d r F 5 Their dot (or scalar) product is AB cos B A B A = + + = z z y y x x B A B A B A z y x B z y x A z y x z y x B B B A A A + + = + + = Consider two vectors 6 ( 29 ( 29 ( 29 ( 29 6 3 4 2 3- =- + = + = y y x x B A B A B A y x B y x A 3 2 4 3- = + = Example: What is the scalar product of the two vectors A and B ? What is the magnitude of each vector? What is the angle between the two vectors?...
View Full Document

Page1 / 22

lecture 10 - 1 Lecture 10 Work and Energy The scalar...

This preview shows document pages 1 - 7. Sign up to view the full document.

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