# Physics Test on Chapter 3, 2-D Motion

PHYSICS: So you ready for that test tomorrow? Since the help session isn’t until tomorrow morning, I thought I’d go ahead and post a couple of old reviews on the homework and worksheet problems (2 different vodcasts from last year). Don’t forget what you should do to start – Draw a picture, write what you know, resolve the resultant velocity into vertical and horizontal if you need to, and find formulas that fit (because it will hardly ever be solved with just one) and go for it!!

If you are talking angular projectiles, the resultant velocity is actually made up of two things – horizontal velocity and vertical velocity. The horizontal velocity never changes, the vertical velocity has a different direction going up and coming down, but it has the same speed at equal levels. If you’re talking horizontal projectiles, the resultant velocity is the same as the horizontal velocity of the gun, because that’s the only kind of initial velocity it has! Relative motion is even easier – just use the Pythagorean theorem and tangent, and use horizontal to find horizontal and vertical to find vertical. Good luck!!

## 14 thoughts on “Physics Test on Chapter 3, 2-D Motion”

1. Matthew D Phys5 says:

What children do you and Olivia share in common?

• Ms. Skinner says:

Matt – Four legged Schnauzer ones! π

2. Zach Cookston P5 says:

So may we use Cory’s derived formula on the test to find time where the objects ends on the same level it started on?

• Ms. Skinner says:

Zach – If you are sure that it will always work.

3. Kamren J P5 says:

I am going to need you to explain number 5 from the worksheet last night tomorrow.

• Ms. Skinner says:

Kamren – Hope it helped this morning. Good luck!

4. Andrew F P5 says:

Do we have a web post due this week? Oh well, I’ll do one anyways.

5. Charlie M P5 says:

Hi Ms Skinner,
Sorry I wasn’t in class on Wednesday, I had a fever Tuesday night and Wednesday. When do you want me to make up the test?

6. Megan G P5 says:

I’m a little nervous about how I did on this test.. I might need a little help. I was also wondering if there was any possible extra credit for missed webposts… π

7. Kamren J P5 says:

There wasn’t anything to make a web post on from this week so I hope this counts! Still trying to figure out this rocket.

8. Matthew D Phys5 says:

Mrs. Skinner, we are writing up the rocket lab right? I couldn’t think of anything I’m prolly just gonna ask youi this tomorrow anyway.

9. Andrew F P5 says:

Is the rocket lab write up due Monday?

10. Cory A P5 says:

Is it possible that the wind could have helped gravity push the rocket down and alter our time a little to give us more error in our final calculations?

11. Megan G P5 says:

I’m so mad I missed finishing our lab Friday! This flu has got me sick as a dog. Did you give us any more hints about it? I hope Courtney’s not too mad at me! π