# Homework Help: Helps on Projectile motion and moment of inertia

1. Jul 25, 2009

### up2dsky89

Hello guys , i am new here .

I am currently doing my college assignment i am required to explain a few physics principle , but currently i am stuck with these two principle :

i) projectile
ii) moment of inertia in rotational of a rigid body

I am required to answer the question that stated as follow :

EXPLANATION ON THE CAUSES AND EFFECTS FROM THE PRINCIPLES for both principle
SUGGESTIONS TO IMPROVE, MINIMIZE OR AVOID THE PROBLEMS for both principle

Hope that everyone could help me or give me some hints and tips on this question

1. The problem statement, all variables and given/known data

EXPLANATION ON THE CAUSES AND EFFECTS FROM THE PRINCIPLES
SUGGESTIONS TO IMPROVE, MINIMIZE OR AVOID THE PROBLEMS

2. Relevant equations

EXPLANATION ON THE CAUSES AND EFFECTS FROM THE PRINCIPLES
SUGGESTIONS TO IMPROVE, MINIMIZE OR AVOID THE PROBLEMS

3. The attempt at a solution

Sorry , i have absolutely no idea on it .

Thanks

2. Jul 25, 2009

### wavingerwin

welcome

in projectile,
CAUSE: you must consider the forces acting while in an object is in a projectile motion, stating any assumptions.
EFFECTS: This will cause the object to go in a path which has a special name

In moment of inertia
CAUSE: well, i'm not a very advanced physicist. as far as i know, moment inertia is there, exists in every singe matter. nothing causes it. It is the equivalent of mass in translational motion.

EFFECTS: try to think what effect does a mass have (consider the 3 Newton's laws). And the apply it to rotational motion to possibly have the effects of a moment of inertia.

Have a read at least at wiki
http://en.wikipedia.org/wiki/Projectile_motion" [Broken]
http://en.wikipedia.org/wiki/Projectile_motion" [Broken]

i leave the 2nd part of the question for you to think about

Last edited by a moderator: May 4, 2017