Turn on thread page Beta
    • Thread Starter
    Offline

    0
    ReputationRep:
    I have the following question which I need guidance on part B.

    Q5A) A crate containing 40 bricks is raised by a forklift through a height of 1.3m to place on a truck bed. Determine the potential energy gained by the crate if each brick has a mass of 1.3kg.

    Answer: PE=mxgxh (40x1.3) 52kg x 9.81 x 1.3 = 663.16J

    Q5B) The crate is then pulled by a hoist a distance of 3.4m across the flat bed in 8 seconds. Determine the work done in moving the crate and the power of the hoist when the coefficient of friction is 0.6

    work done=friction x distance 663.16J x 3.4?
    Offline

    20
    ReputationRep:
    work done = friction * distance... but the friction is not the PE

    to find the friction you need to work out the normal reaction force R and multiply it by the coefficient of friction μ
    • Thread Starter
    Offline

    0
    ReputationRep:
    Would that be 510N x 0.6 = 306?
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: December 31, 2012
Poll
Do you think parents should charge rent?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.