# Normal acceleration

1. Nov 16, 2009

### helpme1

1. The problem statement, all variables and given/known data
Normal acceleration characterizes the change in....

2. Relevant equations
a. value of velocity b. direction of velocity. c. value of angular velocity d. direction of angular velocity e. value of force

3. The attempt at a solution
which one is true ?

2. Nov 16, 2009

### srmeier

What do you think normal acceleration is? And what is the definition of acceleration in general?

3. Nov 16, 2009

### helpme1

n physics, and more specifically kinematics, acceleration is the change in velocity over time. Because velocity is a vector, it can change in two ways: a change in magnitude and/or a change in direction. In one dimension, acceleration is the rate at which something speeds up or slows down. However, as a vector quantity, acceleration is also the rate at which direction changes. Acceleration has the dimensions L T^-2. In SI units, acceleration is measured in metres per second squared (m/s2).

4. Nov 16, 2009

### srmeier

yes i like it, now:

say we have an acceleration vector in two dimensional space, is the normal acceleration component characterizing the change in the velocities' magnitude or the velocities' direction?

5. Nov 16, 2009

### helpme1

direction of velocity. right?

6. Nov 16, 2009

### srmeier

you are a pro!

7. Nov 16, 2009

### helpme1

wow, it's right. :) thanks for your valuable response. but be ready, the newswaves will not stop! ;)lol