What speed should you push the box

  • Thread starter Thread starter mullets1200
  • Start date Start date
  • Tags Tags
    Box Push Speed
Click For Summary
SUMMARY

The discussion revolves around calculating the speed required to push a 2.3 kg box of nails down a roof pitched at 23 degrees, ensuring it comes to rest at the edge, 5.4 m away. The coefficient of kinetic friction is 0.50. The solution involves applying the work-energy principle, where the work done against friction equals the change in kinetic energy. The participants emphasize using energy concepts to solve the problem, specifically focusing on the relationship between initial kinetic energy and the work done by friction.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Familiarity with the work-energy theorem
  • Knowledge of frictional forces and coefficients
  • Ability to draw and interpret free body diagrams
NEXT STEPS
  • Study the work-energy theorem in detail
  • Learn how to calculate frictional forces in inclined planes
  • Explore the concept of kinetic energy and its applications
  • Practice problems involving free body diagrams and forces on inclined surfaces
USEFUL FOR

Students studying physics, particularly those focusing on mechanics, as well as educators looking for practical examples of energy and friction in real-world scenarios.

mullets1200
Messages
14
Reaction score
0

Homework Statement



You and your friend Peter are putting new shingles on a roof pitched at 23degree . You're sitting on the very top of the roof when Peter, who is at the edge of the roof directly below you, 5.4 m away, asks you for the box of nails. Rather than carry the 2.3 kg box of nails down to Peter, you decide to give the box a push and have it slide down to him.
If the coefficient of kinetic friction between the box and the roof is 0.50, with what speed should you push the box to have it gently come to rest right at the edge of the roof?

Homework Equations


I don't know lol



The Attempt at a Solution


so I drew the free body diagram but I really don't know where to go from there. I think the problem is i just don't know which equations to use. any help is appreciated
 
Physics news on Phys.org
Use energies. It starts out with energy that carries it down the roof and stops at the bottom with zero final energy. There was work down on it to change the energy, frictional work.

W = Delta KE
 

Similar threads

How Fast Should You Push the Box of Nails Down the Roof?
  • · Replies 3 ·
Replies
3
Views
11K
What Speed Should You Push a Box of Nails Down a Roof?
  • · Replies 1 ·
Replies
1
Views
5K
What is the optimal speed for a box to slide down a roof with minimal friction?
  • · Replies 6 ·
Replies
6
Views
5K
How Did I Calculate the Speed to Slide Nails Down a Roof?
  • · Replies 1 ·
Replies
1
Views
3K
Calculating acceleration from the coefficient of kinetic friction
  • · Replies 48 ·
2
Replies
48
Views
8K
Truck carrying a box, friction problem
  • · Replies 10 ·
Replies
10
Views
6K
Nails going down the side of the roof
  • · Replies 4 ·
Replies
4
Views
6K
Finding the speed with kinetic friction
  • · Replies 2 ·
Replies
2
Views
18K
Box pushing another box Dynamics
  • · Replies 7 ·
Replies
7
Views
2K
Efficiency of Ramp: Solving Box Push Up Problem
  • · Replies 3 ·
Replies
3
Views
3K