# Mechanics need to get facts straight

1. Jun 4, 2004

### UrbanXrisis

Need to get some facts straight.

A block on an incline with an angle of X...
the normal force is mg
the force parallel to the incline is mgSinX
the force perpendicular to the incline is mgCosX
and the force done against friction is mgCosX?

2. Jun 4, 2004

### AKG

Little of what you put made sense, but I'll tell you what I can.

A block of mass $m$ initially at rest on an incline of angle $\theta$ with coefficient of static friction $\mu$ has:

Force of gravity straight down into the plane, with magnitude $mg$.
Component of force of gravity perpendicular to and into the plane, with magnitude $mg\cos \theta$.
Normal force, $F_N$, counterbalancing that previous force, perpendicular to and out of the plane, with magnitude $mg\cos \theta$.
Component of force of gravity parallel to and down the plane, with magnitude $mg\sin \theta$.
Force of friction parallel to and up the plane of magnitude $\mu F_N = \mu mg\cos \theta$.

3. Jun 4, 2004

### UrbanXrisis

okay, what is the formula for resistance of a wire that includes change in temperature?

4. Jun 4, 2004

### AKG

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/restmp.html

5. Jun 4, 2004

### UrbanXrisis

Is diffraction a property of all waves?

6. Jun 5, 2004

### Gza

These rapid fire questions you are asking can all be researched within a matter of miliseconds, either by glancing at your text, or google.

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