1. Tonight… Revise the last three explanations
What effect does speed have on kinetic energy?
Does the ball accelerate after it leaves the ramp?
Do mass and force affect acceleration?
Write them all on one piece of paper
You may type or write it (typed is preferred)
You will turn them all in tomorrow, one will be picked for grading.

2. Standard
I can determine what causes objects to speed up, slow down  or change direction
Entry Task
Update table of contents
Pg. 41 – Applying Newton’s Second Law
Meet on Pg. 40
You will need a calculator!
Learning Target
How do we apply Newton’s Second Law
At home
Submit Explanations for a grade

3. Do Mass and Force affect Acceleration?
Share explanations
Mass and force do affect acceleration. I know this because when the mass was greater the car accelerated slower. When the force was greater the car accelerated faster. Since Newton’s second law states that mass and force affect acceleration, and mass and force changed acceleration of our car, then I know that mass and force do affect acceleration.

4. Tonight… Revise the last three explanations
Revise and submit all of them on-line by Tuesday 11:59:59 PM
One will be picked for a grade.

7. Calculate the acceleration of each car from Thursday’s lab
Convert the mass of the car to kg (divide each mass by 1000)
57g ÷ 1000 = .057kg
Acceleration = Force divide Mass
A = .3 N ÷.057 kg = 5.2 m/s2
Write the acceleration next to the net force on each system
5.2 m/s2

8. .3
The car speeds up really fast when released
57g
5.2 m/s2
1.8 m/s2
1.2 m/s2
51.6 m/s2

9. Does gravity pull on all objects the same?

11. How is this possible?
.5 g
1000 g
Fall at same rate

12. What we know… More mass = more gravity
Acceleration is a change in motion
Objects change their motion when an unbalanced force acts on them
More mass = more friction
More mass = more inertia
______
______
______________
______
No friction on the moon
______

13. Explanation Do mass and force affect acceleration?40 41

14. Move Your Data from Pg. 39: Mass vs. Weight

15. Convert g to kg. (g ÷ 1000) Use Acceleration = Force ÷ Mass
What is the relationship between mass acceleration?
Use Acceleration = Force ÷ Mass

16. Gravity Accelerates Equally
~9.8 m/sec2
Gravity accelerates (changes the motion) of all things at the same rate

17. Explanation Do mass and force affect acceleration?40 41

18. High gravitational force Low gravitational force
Large Mass
High gravitational force
High inertia
Low Mass
Low gravitational force
Low inertia
Same acceleration

19. Force = 1,623 x 6.4 = 10, 391 N Force of an Corvette engine
Acceleration 6.4 m/sec2
Mass of car: 1,623 kg
Force = 1,623 x 6.4 = 10, 391 N
Reveal the first three bullets and ask students to use the formula to find the acceleration of the car. Really hold their hand on the first one. When everyone has an acceleration. Have a few groups share. They should all be close to 4.2. Reveal the correct and answer and then reveal the mass of the car. Remind them to use F = M x A to find the force the engine uses to accelerate the car.

20. 16,800,000 N Force of a Titan Rocket A = 18.66 m/s2 Mass : 900,000 Kg
F = m/s2 x 900,000 Kg
16,800,000 N
Repeat the process from the last slide for this one, but give them a little more leash

21. Solar Sails
Uses the Solar Wind (charged particles from the sun) to create a constant fore and accelerate a space craft through space.

22. Space Craft mass: 100 Kg (about 220 lbs) F = 100 kg x .005 = .05 N
Force on a Solar Sail: By the time it reaches pluto it is going 45,000 m.sec
Acceleration = m/s2
Space Craft mass: 100 Kg (about 220 lbs)
F = 100 kg x .005 = .05 N
Repeat the other force calculation instructions. Marvel at the difference a little constant force can have over a long period of time – with no other force to balance it. This eventually go 4 times faster than the rocket with % of the force

23. Tonight… Revise the last three explanations
Revise and submit all of them on-line by Tuesday 11:59:59 PM
One will be picked for a grade.