# Gravity stuff

1. Oct 29, 2005

### UnD

Hey i was wondering
i need to perform 2 experients (i can't do the penulum one) using completely different methods to measure the acceleration due to gravity.

I thought of the droping different masses and using the ticky tape timer, ?

Also where will i be able to find these things for the planets in our solar system,
planet radius, acceleration due to gravity at surface, orital radius, orbital period, length of planet, orbital radius of a geostationary satellite and escape velocity.

Thanks

2. Oct 29, 2005

### Chi Meson

yes, a ticker-tape timer would work fine.

http://pds.jpl.nasa.gov/planets/welcome.htm
look under "Planet Profiles"

3. Oct 29, 2005

### UnD

Cool. Thanks i need to find another that is different.
Plz help. thanks

4. Oct 29, 2005

### Chi Meson

Consider the energy approach, you know, PE at top = KE at bottom; mgh = (1/2)mv^2 .

Last edited: Oct 29, 2005
5. Oct 29, 2005

### nguyen713

Whta is the formula for the force of friction of an inclined plane?

6. Oct 30, 2005

### UnD

Hmm, Chi Meson, How will i perform the experiment?
nguyen713, i kind of see what you are getting at, I have forgoten the formula i'll try and look around here.

7. Oct 30, 2005

### Chi Meson

According to the law of conservation of energy, the KE of a low-friction cart at the bottom of the incline is about equal to the PE of the (motionless) cart at the top. speed can be measured, height can be measured, g can be calculated.

I've led you to the door on this one, you have to go in by yourself.

8. Nov 2, 2005

### UnD

Oh k, Cool thanks.