What is the work done by friction on a sliding box?

Click For Summary
SUMMARY

The discussion focuses on calculating the work done by friction on a sliding box with a mass of 12 kg and an initial speed of 10 m/s as it transitions from a smooth surface to a rough surface with a frictional force of 72 N over a distance of 3.0 m. The work done by the frictional force is calculated using the formula Work = Force x Displacement, resulting in 216 Joules. Additionally, the discussion addresses the box's final velocity after leaving the rough surface and the distance required to bring the box to a complete stop.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Familiarity with the concept of work and energy in physics
  • Knowledge of frictional forces and their effects on motion
  • Basic algebra for solving equations
NEXT STEPS
  • Study the principles of kinetic energy and how it relates to work done by friction
  • Learn about the equations of motion for objects under constant acceleration
  • Explore the concept of coefficient of friction and its impact on sliding objects
  • Investigate real-world applications of friction in engineering and physics
USEFUL FOR

Students studying physics, educators teaching mechanics, and anyone interested in understanding the effects of friction on motion and energy transfer.

tiffanyg
Messages
11
Reaction score
0
1. a box of mass 12 kg slides at a speed of 10 m/s acros a smooth level floor, where it enters a rough portion 3.0 m in length. In the rough portion, the box experiences a horizontal friction force of 72N.

a) how much work is done by the frictional force?
b) what is the velocity of the box when it leaves the rough surface?
c) what length of rough surface brings the box coompletely to rest?

Since, I got stuck in the first question...i tried this:

F net= ff+fn
fnet = 72 n+ mg

fnet= 189.6 n

fnet/m = a

a= 15.8 ---> i don't know if a is right...
 
Physics news on Phys.org
Ok the first part asks how much work is being done. Work is normally measured in Joules. Try the equation Work = Force x Displacement .
 

Similar threads

High School Box being pulled up a slope with friction
  • · Replies 3 ·
Replies
3
Views
2K
MHB Calculate the Length & Potential Energy of a Sliding Box on a Ramp
  • · Replies 9 ·
Replies
9
Views
2K
Forces and velocities of a sliding box
  • · Replies 1 ·
Replies
1
Views
2K
High School Are frictional forces action forces or reaction forces?
  • · Replies 14 ·
Replies
14
Views
2K
Need to calculate work -- Lifting and then sliding a box....
  • · Replies 4 ·
Replies
4
Views
2K
Work done by particle in a box in expanding the box?
  • · Replies 1 ·
Replies
1
Views
2K
Is it possible to express friction force as a tensor?
  • · Replies 2 ·
Replies
2
Views
2K
Yes! Calculating Friction Coefficient
  • · Replies 1 ·
Replies
1
Views
1K
Calculating the frictional forces on a sliding box on a ramp
  • · Replies 2 ·
Replies
2
Views
4K
Find the weight of a box sliding on a floor....
  • · Replies 3 ·
Replies
3
Views
1K