• Support PF! Buy your school textbooks, materials and every day products via PF Here!

Force and work on a shopping cart

  • Thread starter aaronb
  • Start date
23
0
1. Homework Statement
A shopper in a supermarket pushes a cart with a force of 35.0 N directed at an angle of 28.0° downward from the horizontal. Find the work done by the shopper on the cart as he moves down an aisle 46.0 m long.

What's going on?

2. Homework Equations
W = Force * displacement


3. The Attempt at a Solution
I used the formula above to get
F=35(cos(28))46= 1610

I don't know how else to approach the problem
 

Attachments

Last edited:

Delphi51

Homework Helper
3,407
10
Re: Work

I think your answer is correct. The vertical component of the force pushes the cart into the floor but there is no movement in that direction so it doesn't do any work. Only the 35*cos(28) component does work as you wrote.
 
23
0
Re: Work

According to my homework website, I'm wrong from 10%-100%. =(
 
Re: Work

Maybe they are wrong?

It happens.
 

alphysicist

Homework Helper
2,238
1
Re: Work

Hi aaronb,

1. Homework Statement
A shopper in a supermarket pushes a cart with a force of 35.0 N directed at an angle of 28.0° downward from the horizontal. Find the work done by the shopper on the cart as he moves down an aisle 46.0 m long.

What's going on?

2. Homework Equations
W = Force * displacement


3. The Attempt at a Solution
I used the formula above to get
F=35(cos(28))46= 1610
I believe you are making a calculator error here. When you did the calculation, you left out the trig function, because 35 x 46=1610.
 
23
0
Re: Work

You're right!
 

Related Threads for: Force and work on a shopping cart

Replies
8
Views
4K
Replies
2
Views
11K
  • Posted
Replies
2
Views
2K
J
Replies
4
Views
973
  • Posted
Replies
13
Views
3K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top