Pendulum problem-last answer was wrong please

  • Thread starter Thread starter bharp24
  • Start date Start date
  • Tags Tags
    Pendulum
Click For Summary
SUMMARY

The pendulum problem involves a rock with a mass of 0.12 kg attached to a massless string of length 0.80 m, swinging to a maximum angle of 45 degrees from the vertical. The speed of the rock at the vertical position can be determined using the conservation of energy principle, where potential energy at the highest point converts entirely to kinetic energy at the lowest point. The tension in the string at the vertical position is calculated by considering both the gravitational force and the centripetal force acting on the rock.

PREREQUISITES
  • Understanding of conservation of energy principles
  • Basic knowledge of pendulum mechanics
  • Familiarity with gravitational force calculations
  • Ability to calculate tension in strings under dynamic conditions
NEXT STEPS
  • Study the conservation of energy in mechanical systems
  • Learn how to calculate the speed of objects in pendulum motion
  • Explore the dynamics of tension in pendulums at various angles
  • Investigate the effects of air resistance on pendulum motion
USEFUL FOR

Physics students, educators, and anyone interested in understanding pendulum dynamics and energy conservation principles.

bharp24
Messages
14
Reaction score
0
pendulum problem--last answer was wrong..need help please!

A small rock with mass 0.12 is fastened to a massless string with length 0.80 to form a pendulum. The pendulum is swinging so as to make a maximum angle of 45 with the vertical. Air resistance is negligible.

What is the speed of the rock when the string passes through the vertical position?

What is the tension in the string when it makes an angle of with the vertical?

What is the tension in the string as it passes through the vertical?
 
Physics news on Phys.org
For the first question you need to look at conservation of energy. The pendulum is at its lowest point when in the vertical position, so it has no potential energy. Thus all energy must be kinetic. Likewise, when its at the highest position (454 degree angle with vertical), it has no kinetic energy but maximum potential energy.
 
thanks! i figured it out a little bit ago though!
 

Similar threads

Foucault Pendulum at the North Pole
  • · Replies 9 ·
Replies
9
Views
3K
Work done on a conical pendulum
  • · Replies 3 ·
Replies
3
Views
3K
Tension in string for a bob pendulum
  • · Replies 11 ·
Replies
11
Views
6K
For a Pendulum: Knowing Acceleration Find Maximum Angle
  • · Replies 26 ·
Replies
26
Views
4K
Finding the period of a pendulum in motion along a curve
  • · Replies 8 ·
Replies
8
Views
2K
What is the correct tension equation for a pendulum at rest?
  • · Replies 2 ·
Replies
2
Views
2K
Swinging Tarzan: Solving for Maximum Height & Angle
  • · Replies 3 ·
Replies
3
Views
3K
Rotational Motion of a pendulum
  • · Replies 6 ·
Replies
6
Views
5K
Is the Angular Momentum of a Pendulum Conserved?
  • · Replies 5 ·
Replies
5
Views
6K
Simple Pendulum undergoing harmonic oscillation
  • · Replies 21 ·
Replies
21
Views
3K