# Homework Help: Accelerated Motion Problem-easy but I NEED HELP on it

1. Dec 8, 2007

### physicsbhelp

[SOLVED] Accelerated Motion Problem--easy but I NEED HELP on it!!!

Is NOT an example of accelerated motion?

e. Horizontal component of projectile motion

Last edited: Dec 8, 2007
2. Dec 8, 2007

### Shooting Star

What happens to the horz component of the velocity in projectile motion?

3. Dec 8, 2007

### Shooting Star

Yes, since it stays constant.

4. Dec 8, 2007

### Astronuc

Staff Emeritus
Well - one could look at each answer and think about the acceleration involved.

Going vertical near a massive body, e.g. earth or moon, a mass will experience the force (acceleration) due to gravity.

Something that involves a change of direction (something rotating, swinging, oscillating) is accelerating, even if it maintains constant speed.

The last answer would seem to infer constant speed (and velocity) provided a retarding or dissipating force (e.g. air resistance or friction) is not involved. Such would be the case in a vacuum or on a frictionless surface.

5. Dec 8, 2007

### Shooting Star

Also, we have to assume uniform gravitational field.

6. Dec 8, 2007

### Astronuc

Staff Emeritus
i.e. that it doesn't change direction/orientation so as to affect motion perpendicular to the field.