The ballistic pendulum is a commonly used laboratory apparatus to demonstrate the conservation of linear momentum. An object, in this case a plastic ball, is horizontally fired with some initial velocity into a pendulum. At impact, the pendulum swings upward as shown in Fig. 1. The pendulum reaches some height (h) depending on the momentum of the ball. The maximum height (h) in which the pendulum rises depends on the initial kinetic energy of the ball. The usefulness of this is that we can determine the initial velocity of the ball without directly measuring it. Refer to Fig. 1 below. The mass (m) is the mass of the ball. After impact, the mass is combined with the block as labeled (M + m). The pendulum bob swings upward to a height (h). It is easiest to think of this experiment in two parts: 1) The ball and pendulum are combined into one system during an inelastic collision and moves with some initial kinetic energy (KE). 2) This kinetic energy is transformed into gravitational potential energy (PE) as the pendulum swings upward to a height (h).

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
icon
Related questions
Question

https://ophysics.com/e3.html

Introduction
The ballistic pendulum is a commonly used laboratory apparatus to demonstrate the conservation of
linear momentum. An object, in this case a plastic ball, is horizontally fired with some initial velocity
into a pendulum. At impact, the pendulum swings upward as shown in Fig. 1. The pendulum reaches
some height (h) depending on the momentum of the ball. The maximum height (h) in which the
pendulum rises depends on the initial kinetic energy of the ball. The usefulness of this is that we can
determine the initial velocity of the ball without directly measuring it.
Refer to Fig. 1 below. The mass (m) is the mass of the ball. After impact, the mass is combined
with the block as labeled (M + m). The pendulum bob swings upward to a height (h). It is easiest to think
of this experiment in two parts: 1) The ball and pendulum are combined into one system during an
inelastic collision and moves with some initial kinetic energy (KE). 2) This kinetic energy is transformed
into gravitational potential energy (PE3) as the pendulum swings upward to a height (h).
m
M+m
(a)
(b)
Figure 1. a) Image: PASCO 6831 Ballistic pendulum and launcher [6]. b) Schematic of the ball being fired into the ballistic
pendulum.
Once the ball impacts the pendulum, the ball-box system moves as one mass with the same velocity.
mv, = (m + M)v,
(1)
After the collision, the ball-box system moves upward to a height (h). From the conservation of
mechanical energy, the initial KE is transformed into PEg.
(m + M)v} = (m + M)gh
(2)
%3D
We can solve for v, simply by measuring the height (h) of the pendulum.
Transcribed Image Text:Introduction The ballistic pendulum is a commonly used laboratory apparatus to demonstrate the conservation of linear momentum. An object, in this case a plastic ball, is horizontally fired with some initial velocity into a pendulum. At impact, the pendulum swings upward as shown in Fig. 1. The pendulum reaches some height (h) depending on the momentum of the ball. The maximum height (h) in which the pendulum rises depends on the initial kinetic energy of the ball. The usefulness of this is that we can determine the initial velocity of the ball without directly measuring it. Refer to Fig. 1 below. The mass (m) is the mass of the ball. After impact, the mass is combined with the block as labeled (M + m). The pendulum bob swings upward to a height (h). It is easiest to think of this experiment in two parts: 1) The ball and pendulum are combined into one system during an inelastic collision and moves with some initial kinetic energy (KE). 2) This kinetic energy is transformed into gravitational potential energy (PE3) as the pendulum swings upward to a height (h). m M+m (a) (b) Figure 1. a) Image: PASCO 6831 Ballistic pendulum and launcher [6]. b) Schematic of the ball being fired into the ballistic pendulum. Once the ball impacts the pendulum, the ball-box system moves as one mass with the same velocity. mv, = (m + M)v, (1) After the collision, the ball-box system moves upward to a height (h). From the conservation of mechanical energy, the initial KE is transformed into PEg. (m + M)v} = (m + M)gh (2) %3D We can solve for v, simply by measuring the height (h) of the pendulum.
Step 1) The projectile (ball) is carefully loaded into the launcher using the ramrod.
Step 2) The launcher is set to its medium setting.
Step 3) Visit the website: https://ophysics.com/e3.html
Step 4) The pendulum angle gauge is set to the 0° mark.
Step 5) Set the mass of the projectile to 50.0 g.
Step 6) Slide the initial velocity scale to the middle.
Step 7) Set the mass of the wood block to 3.5 kg.
Step 8) A motion sensor is setup to record the velocity of the ball. Click the box at the bottom of the
page to see the initial velocity.
Step 9) The projectile is loaded and settles into the chamber before launching.
Step 10) Slide the height scale to align parallel to the projectile.
Step 11) Click the Fire button. When the system reaches its maximum height, click the Pause button.
Step 12) While paused, slide the height scale so that it aligns parallel to the projectile and record this
value.
Step 13) Determine the initial velocity of the projectile (ball) and the final velocity of the system. Show
all steps in your calculations.
Initial Velocity of Ball (vo)
m/s
Final Velocity of System (v)
m/s
Transcribed Image Text:Step 1) The projectile (ball) is carefully loaded into the launcher using the ramrod. Step 2) The launcher is set to its medium setting. Step 3) Visit the website: https://ophysics.com/e3.html Step 4) The pendulum angle gauge is set to the 0° mark. Step 5) Set the mass of the projectile to 50.0 g. Step 6) Slide the initial velocity scale to the middle. Step 7) Set the mass of the wood block to 3.5 kg. Step 8) A motion sensor is setup to record the velocity of the ball. Click the box at the bottom of the page to see the initial velocity. Step 9) The projectile is loaded and settles into the chamber before launching. Step 10) Slide the height scale to align parallel to the projectile. Step 11) Click the Fire button. When the system reaches its maximum height, click the Pause button. Step 12) While paused, slide the height scale so that it aligns parallel to the projectile and record this value. Step 13) Determine the initial velocity of the projectile (ball) and the final velocity of the system. Show all steps in your calculations. Initial Velocity of Ball (vo) m/s Final Velocity of System (v) m/s
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 4 steps with 1 images

Blurred answer
Knowledge Booster
Properties of Fluids
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Elements Of Electromagnetics
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Control Systems Engineering
Control Systems Engineering
Mechanical Engineering
ISBN:
9781118170519
Author:
Norman S. Nise
Publisher:
WILEY
Mechanics of Materials (MindTap Course List)
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:
9781337093347
Author:
Barry J. Goodno, James M. Gere
Publisher:
Cengage Learning
Engineering Mechanics: Statics
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:
9781118807330
Author:
James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:
WILEY