How Can I Apply Newton's Second Law with Friction in Real-Life Problems?

Click For Summary
SUMMARY

This discussion focuses on applying Newton's Second Law in scenarios involving friction, specifically through a practical problem involving a 15 kg lawnmower being pushed with a 90 N force at a 30-degree angle. The key calculations involve determining the horizontal frictional force and the normal force acting on the mower. Participants emphasize the necessity of understanding kinetic friction to solve for the frictional force when acceleration is zero.

PREREQUISITES
  • Understanding of Newton's Second Law of Motion
  • Basic knowledge of forces and friction, including kinetic friction
  • Ability to resolve forces into components
  • Familiarity with free-body diagrams
NEXT STEPS
  • Study the concept of kinetic friction and its coefficients
  • Learn how to resolve forces into horizontal and vertical components
  • Explore free-body diagram techniques for analyzing forces
  • Practice problems involving Newton's laws with frictional forces
USEFUL FOR

Students studying physics, particularly those tackling mechanics and forces, as well as educators looking for practical examples of Newton's Second Law in real-life applications.

gotmilk954
Messages
4
Reaction score
0
ok, i need some serious help with Newtons second law. like i kind of understand it, but adding things like friction are giving me real problems. does anyone have any good resources or tips on how to understand/comprehend this?

and i have a prolem:

a man pushes a 15 kg lawnmower at constant speed with a force of 90 N directed along the handle, which is at an angle of 30 degrees to the horizontal. calucalte: (a) the horizontal frictional force on the mower, and (b) the normal force
on the mower.

well i know the acceleration is zero, but don't you need the kinetic friction to find the frictional force?
 
Last edited:
Physics news on Phys.org

Similar threads

Newton's law problem: Pushing 2 stacked blocks on a horizontal table
  • · Replies 13 ·
Replies
13
Views
3K
Having a hard time learning Newton's 2nd law
  • · Replies 5 ·
Replies
5
Views
2K
Static Friction Required to Keep the System from Moving (Two Boxes)
  • · Replies 16 ·
Replies
16
Views
3K
Understanding Newton's 2nd Law of Motion
  • · Replies 6 ·
Replies
6
Views
2K
Newton's third law -- I have trouble with some real-life examples
  • · Replies 6 ·
Replies
6
Views
3K
How can we model a rolling truck on an incline using rotational motion analysis?
  • · Replies 24 ·
Replies
24
Views
3K
Newton's Second Law Rocket Problem
  • · Replies 13 ·
Replies
13
Views
2K
Applications of Newton's laws (friction related)
  • · Replies 8 ·
Replies
8
Views
2K
Ideal Vs Real Mass Pulley system
  • · Replies 10 ·
Replies
10
Views
5K
Problem of spring block system: force vs conservation of energy
  • · Replies 20 ·
Replies
20
Views
3K