1. Solve the following equation for t:
Pre-class Monday
Solve the following equation for t:
Vf = Vi + at

2. PHYSICS Give back test and go over it Algebra review
Covering 2 chapters this week (they are closely related)
Begin ch 4: Forces
BIOLOGY
CHEMISTRY

3. What is the mascot for James Clemens’ high school?
Pre-class Tuesday
What is the mascot for James Clemens’ high school?

4. NEWTON’S FORCES What is a force? Newton’s 3 Laws of Motion
Push or pull exerted on an object
Vector
Variable: F
Newton’s 3 Laws of Motion

5. NEWTON’S FIRST LAW
An object at rest tends to stay at rest. An object in motion tends to stay in motion in a straight line unless acted upon by an external force.

6. NEWTON’S SECOND LAW
F = m a

7. F = m a FORCE F : force (Newtons, N) m : mass (kilograms, kg)
a : acceleration (m/s2)

8. NEWTON’S THIRD LAW
For every action there is an equal and opposite reaction.

9. Launching Force Project
Objective
Apply the equations of motion and Newton’s Laws
Materials
2-L bottle
Cardstock, tape, scissors, etc.
Deadlines
Construct in-class by Friday
Launch next Monday

10. Pre-class Wednesday 1-25-12
How much force is required to accelerate a 10 kg mass at 5 m/s2?
Hint: use THE equation from friday

11. f
Types of Forces T W

12. W = m g WEIGHT W : weight (Newtons, N) m : mass (kilograms, kg)
g : acceleration of gravity (9.8 m/s2)

13. SF=ma Net Forces The total forces acting on an object
Draw free-body diagram to show forces
Ignore external forces
Keep X and Y directions separate
SF=ma

14. Examples of Free-body Diagrams

15. Lego My Car Procedures Materials Lego kits Spring scales Masses
Using the Lego kit, build a simple car or truck. Be sure it is large enough to hold some small masses and a place to attach the spring scale.
Place the car on a level surface. Attach the spring scale to it.
With a constant velocity, pull the car along the ground with the spring scale.
Record the value of the force.
Change the weight of the car by adding more masses. Repeat 3 times.
Based on your results, what is the relationship between weight and applied force?
Materials
Lego kits
Spring scales
Masses

16. How much does a 10 kg mass weigh?
Pre-class Thursday
How much does a 10 kg mass weigh?
Hint: use one of the equations from yesterday

17. Terminal Velocity
The maximum speed that can be obtained by a falling object
The force of gravity is equally balanced by the air resistance force (drag)
Constant speed, no acceleration

18. Measuring Effects of Air Resistance
Materials
Meter stick
Paper
Stopwatch
Scissors
Procedures
Drop a flat piece of paper 2 m. Measure the time for it to fall.
Crumple the piece of paper into a loose ball.
Measure time to fall in 2 m.
Crumple the piece of paper into a tighter ball.
Measure time to fall 2 m.
Use the scissors to design your own paper object.
Type
Time (s)
Flat paper
Loosely crumpled
Tightly crumpled
Your design
What characteristic of the paper affected the falling time the most?

19. CH 4 HW (p ) N
61. 6,900 N kg
65. balloon, basketball, shot-put (b. reverse)
N, bag does not hold
m/s, 3185 N
Top to bottom: 45 N, 57 N, 93 N m
m/s2, 98 m/s, -49 N, 10 s
N, 2.4 m/s2

20. Pre-class for Wednesday 8-22-07
Identify the forces on the crate by drawing a free-body diagram. Be sure to label each force and show its direction.

21. CHAPTER 4 &5 EQUATIONS
SF=ma
W = m g
f = m FN
F = ma FN

22. EQUILIBRIUM Take attendance Give back graded work
Go over home work problems
Finish chapter
If time, work on homework

23. Lego My Car Procedures Materials
Using the Lego kit, build a simple car or truck. Be sure it is large enough to hold some small masses and a place to attach a rubber band.
Place the car on a level surface. Cut and attach a rubber band to it.
Determine the length the rubber band stretches to get the car moving.
Change the weight of the car by adding more masses. Determine the length the rubber band stretches in moving the car. Repeat 4 times.
Without actually performing the experiment, describe for me (Be specific!) how you would determine the force needed to move the car.
Materials
Rubber bands
Lego kits
Ruler
Masses

24. TEST OVER CHAPTER 5
Take the time before the pep rally to study (about 20 minutes)
turn in homework before you leave for pep rally
return to this room, then we will go next door