Gravity Simulator

http://www.nowykurier.com/toys/gravity/gravity.html

Homework (Due 12/7)

Answer the following questions on a separate piece of paper:

1.      If the centripetal acceleration of an object is 30 m/s² and the mass of the object is 2 kg, what is the magnitude and direction of the centripetal force? Draw a diagram that shows an object with centripetal acceleration and draw the direction of that force.

2.      Why is centripetal acceleration called acceleration, even when the object is going at a constant speed?

3.    

  Copy the diagram above.

a.       Which direction is the velocity of the satellite at this moment? What direction is the centripetal force? Label these v1 and F1.

b.      After the satellite has orbited halfway around the earth, what direction is its velocity? Its centripetal force? Label these v2 and F2.

Link to the textbook readings:
Textbook Reading

PheT simulations

Here is the one for force and motion:
Forces

Problem Set - Due Friday 11/13

RP2: Problem Set I:

1.  A 6.0 kg block rests on top of a 7.0 kg block, which is resting on a horizontal table.a.       What is the force exerted by the 6 kg block on the 7 kg block (include magnitude and direction)
b.      What is the force exerted by the 7 kg block on the 6 kg block?
 2.      A 90 kg man and a 55 kg man have a tug-of-war. The 90 kg man pulls on the rope such that the 55 kg man accelerates at 0.025 m/s². What force does the rope exert on the 90 kg man?
 3.      You are dragging a box full of books from one room to another. The box and books together have a combined weight of 134 N. If the coefficient of static friction between the pavement and the box is 0.55, how hard must to push in order to get the box moving?
  4.      You move a 41 kg bookcase to a different place in the house. If you push with a force of 65 N and the bookcase accelerates at 0.12 m/s² , what is the coefficient of kinetic friction between the bookcase and the carpet?
 5.      You push a 13 kg table with a horizontal force of 20 N, but it does not move. However, you push it when a horizontal force of 25 N and it accelerates at 0.26 m/s². From this information, what can you conclude about the coefficients of static and kinetic friction? 

Static and Kinetic - Khan Academy

Video on Newton's Third Law

This might be helpful!

Bozeman Science - Newton's Third Law

Forces At Work - Week of 11/2

Happy November, everyone!

Upcoming Dates of Interest:
RP2 Mini Unit 2 Quiz: Friday November 13th
Veterans Day - Wednesday, November 11th
Best of Thomas Brunch: Thursday, November 5th

This week we will be finishing up our concept base for Newton's laws and move onto some more difficult applications. The big question driving our mini-unit is: how do objects resist motion?

Newton's Third Law

Here are some resources for us from the usual suspects:
Physics Classroom - Friction
Khan Academy - Friction

Remember again that you can access important information on the class dropbox. I have also attached a link to the relevant textbook readings here.

Have a great week!

AZ8JK6SZZ 

Report Period 2 Preview

Hello! RP2 will be about forces and their interactions! We will be drawing heavily from our knowledge from RP1 on vectors.

Go Here for Calendar and Important Course Documents 

Essential Understandings:
Forces explain the interactions between objects which cause a change in motion in one or both of the interacting objects. Newton's laws of motion explain the effects of forces on an object's motion for almost all objects at the macroscopic level. Any discrepancies to these laws are most likely due to the neglect of another force.

A stable system is one in which the internal and external forces are such that any small change results in forces that return the system to its prior state. A system can be static (unmoving) but unstable, with any small change leading to forces that tend to increase the change. A system can be changing but have stable repeating cycles of change.

Schedule:
Tuesday 10/27 - Mini Unit 1 - Why do Object's move in one dimension?
Tuesday 11/3 - Mini Unit 1 QUIZ
Wednesday 11/4 - Mini Unit 2 - Why do object's resist motion?
Wednesday 11/11 - No School Veterans Day
Friday 11/13 - Mini Unit 2 QUIZ
Monday 11/16 - Mini Unit 3 - Why do  object's move in two dimensions?
Monday 11/30 - No School - Professional Development for Teachers
Wednesday 11/25 - 11/27 - No School - Thanksgiving Break
Wednesday 12/2 - Mini Unit 3 QUIZ
Thursday 12/3 - Mini Unit 4 - How can Newton's Laws of Motion apply to the movement of planetary objects?
Thursday 12/10 - Mini Unit 4 QUIZ
Friday 12/11 - Mini Unit 5 - How can the interaction between force and motion be quantified?
Thursday 12/17 - Mini Unit 5 QUIZ
Wednesday - Thursday 11/23-24: BENCHMARK DAYS AND WINTER BREAK!

10/13 Angles and Stuff

I wanted to play Angry Birds with you because it's an amazing way of conceptualizing projectile motion, but it's blocked on the school network. Whatever - sic transit gloria mundi amirite?

Today we discussed the factors that contribute to a projectile's motion. We identified:
- Air Resistance - will slow objects down
- Initial Velocity - will change how far an object goes but not how long it takes to fall
- Gravity - will change how quickly the object accelerates (for example, acceleration due to gravity on the moon is - 2.16 m/s^2 as opposed to -9.81 m/s^2 on earth)
- Angle - What angle the object is thrown:

Graphic:

When we focused on angle, we wanted to know how high, far, and how long it would take for an object to travel if we changed the angle. This is what we will investigate tomorrow!

Physics - Week of 10/13-10/16

Hi All,

This week we are finishing up mini-unit 4 on projectile motion. Hopefully, we can finish by Thursday and begin reviewing for benchmarks the end of Thursday. Benchmarks are next week on Wednesday and Thursday. I hope everyone enjoyed their day off!

Tuesday: 
What factors affect the motion of a projectile? 

Wednesday: 
How does the angle of a projectile affect its motion?

Thursday: 
Solve projectile motion problems: maximum distance, flight time / Benchmark Overview

Friday: 
How can we apply what we learned throughout this unit? 
Focus: Distance, Displacement, Velocity, and Graphing 

Here are a few very helpful resources on projectile motion: 

The Physics Classroom - Projectiles
Projectile Motion Simulation (Same One from Class)
Khan Academy - Projectile Motion