Interested in taking AP Bio next year? Investigate the curriculum on College Board (LINK) and Khan Academy (LINK), and let me know.
#Goals: SWBAT...
1.Calculate the force of impact
2. Define Impulse
3. Calculate Impulse
WARM-UP & HW Check:
A. What is Impulse equal to?
B. List five devices/objects which increase the time of a collision
C. Solve: A 50 kg Jalen steps off a 100.0 cm high wall. If Jalen DOESN'T BEND HIS KNEES such that he stops his downward motion and the time during the collision is 0.02 seconds, what is the force of impact caused by the ground on Jalen?
CLASSWORK:
1. 081A: Impulse Notes
- In addition to your notes on Impulse from last nights video...
Formula: FΔt or mΔv or Δp
Definition: product of the average force and the time interval during a collision.
Units: Newton-seconds or N•s
Symbol: Impulse, Imp, J, I
2. 081B: Practice problems:
Consider a collision of a tennis ball with a wall. Depending on the physical properties of the ball and wall, the speed at which the ball rebounds from the wall upon colliding with it will vary. The diagrams below depict the changes in velocity of the same ball. For each representation (vector diagram, velocity-time graph, and ticker tape pattern), indicate which case (A or B) has the greatest change in velocity, greatest acceleration, greatest momentum change, and greatest impulse. Support each answer.
Greatest Impulse?
Learning at Home (HW)
- Complete 081B
- Homework: Watch: https://www.youtube.com/watch?v=ph48Xwj_eS8
There is no formal Edpuzzle, so you'll need to pause and answer questions as listed below:
Time Instructions
1:07 1. Which ball experiences the greater change in momentum?
2:00 2. Are the change in momentum and the impulse different?
2:50 3. How does the crumple zone in the Honda Civic make the car safer for the driver during a collision?
3:30 4. Copy the problem "Calculate the impulse and the force on both the car and the man". Write the given info
6:00 5. Pause the video, and solve the problem. When you're done, unpause, and check your answer :)
#Goals: SWBAT...
1. State why v1f = v2i
2. Calculate the force of impact
WARM-UP & HW Check:
A. When you jump from a height to the ground, you let your legs bend at the knees as your feet hit the floor. Why?
B. What happens if you don't bend your knees? Why?
C. What is the formula for Newton's Second Law?
D. What is the meaning of Δv? What about Δt? Δp?
CLASSWORK:
1. 081A: Calculating the Force of Impact (video notes)
- How do we determine force?
- Video Link: https://edpuzzle.com/media/588643608976393e17efd22f
2. 081B: Practice problems:
A. A 50 kg Jalen steps off a 100.0 cm high wall. If Jalen bends his knees such that he stops his downward motion and the time during the collision is 0.50 seconds, what is the force of impact caused by the ground on Jalen?
B. A 50 kg Jalen steps off a 100.0 cm high wall. If Jalen bends his knees such that he stops his downward motion and the time during the collision is 0.25 seconds, what is the force of impact caused by the ground on Jalen?
C. A 50 kg Jalen steps off a 100.0 cm high wall. If Jalen bends his knees such that he stops his downward motion and the time during the collision is 1.00 seconds, what is the force of impact caused by the ground on Jalen?
D. Tomorrow we will solve another one of these. Be ready :) Come see me at nutrition or lunch with questions...
Learning at Home (HW)
- Complete 081B
- 81C: Watch: https://edpuzzle.com/media/5886453b8c8de93e3be6bca9 take notes and answer the edpuzzle questions
WARM-UP:
1. Define the term, "affinity"
2. Define the term, "electron affinity"
CLASSWORK:
1. #081A Notes/Review of Insulators and Conductors.
Slideshow: LINK
2. #081B: HW Review: LINK
3. #081C: Friction Rod Activity LINK
4. #081D: Coulombs Law Also, What is a Coulomb? LINK
5. Day 73 Quiz corrections (continued)
**Tomorrow (friday) we will complete the portions of above we don't complete today (likely 081D and quiz corrections) . We will also review wave concepts for monday's exam.
HOMEWORK
Wave Exam Monday, May 14
1. Laser Labs Due Friday (stuck? - here's a video to help you calculate the diameter of the hair: LINK)
2. 081E: Complete questions 7-12 on Charging by Friction LINK
Bring table of friends tomorrow