6.6 Notes (Work Part 1)

# 6.6 Notes (Work Part 1) - Hooke’s Law The force F...

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

Work Part 1- Section 6.6 Constant Force: The amount of work done by a constant force F is W = Fd where d is the distance an object is moved by a force F . Units: Force: lb or N= kg · m/s 2 (Newtons) Work: ft-lb, in-lb or J=N · m (Joules) Example 1: A 150 lb man is climbing a 20 ft pole. Calculate the work done by the man to reach the top. Example 2: A 750 ft cable weighing 6 lb/ft is connected to and elevator weighing 1500 lb. Find the work done to lift the elevator 500 ft. Variable Force: The work done by a force F ( x ) as an object is moved from a to b is W = Z b a F ( x ) dx

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

View Full Document
Back to Example 2: What work do you need to show for these types of problems? 1. 2. 3. 4. Example 3: A mountain climber is about to haul up a 50m length of hanging rope. How much work will it take if the rope weighs .6 N/m ?

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Hooke’s Law: The force F required to compress or stretch a spring is given by F = kx where k is the spring constant and x is the amount the spring is stretch or compressed from its natural length. Example 4: A spring of natural length 12” is stretched to 15” under a weight of 10 lb. (a) Find the work done (units of in-lbs) to stretch it from 12” to 13”. (b) Find the work done to stretch it from 15” to 18”. Example 5: It takes 100 in-lb of work to stretch a spring from its natural length of 10” to 20”. (a) Determine the spring constant k . (b) Determine the work done to stretch the spring from 12” to 14”....
View Full Document

{[ snackBarMessage ]}

### Page1 / 4

6.6 Notes (Work Part 1) - Hooke’s Law The force F...

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

View Full Document
Ask a homework question - tutors are online