DAY 80
Chromebook assignments for new students
Per 1: Per 2:
Betta: #10 Chris #3
Karylle #30
#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. 080A: Calculating the Force of Impact (12 min)
- How do we determine force?
- Video Link: https://edpuzzle.com/media/588643608976393e17efd22f
2. 080B: Practice problems: (15 min)
A. A 50.0 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 0.250 seconds, what is the force of impact caused by the ground on Jalen?
B. A 50.0 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 0.500 seconds, what is the force of impact caused by the ground on Jalen?
C. A 50.0 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. Tuesday we will solve another one of these. Be ready :) Come see me at nutrition or lunch with questions...
3. Time to work on Cart and Brick Lab
- info on Day 79
- due Tuesday night
Learning at Home (HW)
- Complete 080B if necessary
- 80C: Watch: https://edpuzzle.com/media/5886453b8c8de93e3be6bca9 take notes and answer the edpuzzle questions
- Monday is a holiday. In honor of Dr. King, be kind to someone. And also don't come to school.
- Notebook check for this week and next week (day 76-83) on Friday. You should have:
- Day labels, warmups, classwork, homework notes
#GOALS: SWBAT...
1. Define momentum, its symbol, and its units.
2. Explain how the total momentum before a collision relates to the total momentum after a collision for elastic and inelastic collisions.
3. Calculate momentum for various situations.
WARM-UP 80 01/11/19 (5 minutes)
**Today you must get your work signed by your substitute (Mr. Potkin) at the end of the period. I will check your assignment on Monday**
Write a shortened version (Paraphrase) of each statement in your notebook. Then say whether the statement is True of False. You have approximately 25 seconds to answer each one
Which of the following statements are true about momentum?
Momentum is a vector quantity.
The standard unit on momentum is the Joule.
An object with mass will have momentum.
An object which is moving at a constant speed has momentum.
An object can be traveling eastward and slowing down; its momentum is westward.
Momentum is a conserved quantity; the momentum of an object is never changed.
The momentum of an object varies directly with the speed of the object.
Two objects of different mass are moving at the same speed; the more massive object will have the greatest momentum.
A less massive object can never have more momentum than a more massive object.
Two identical objects are moving in opposite directions at the same speed. The forward moving object will have the greatest momentum.
An object with a changing speed will have a changing momentum.
CLASSWORK
080A: Momentum Practice
Paraphrase each question into your notes, then answer it
1. Which of the following objects have momentum? Include all that apply.
a. An electron is orbiting the nucleus of an atom.
b. A UPS truck is stopped in front of the school building.
c. A Yugo (a compact car) is moving with a constant speed.
d. A small flea walking with constant speed across Fido's back.
e. The high school building rests in the middle of town.
2. A truck driving along a highway road has a large quantity of momentum. If it moves at the same speed but has twice as much mass, its momentum is ________________.
3. A physics cart rolls along a low-friction track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is ____.
4. Two objects, A and B, have the same size and shape. Object A is twice as massive as B. The objects are simultaneously dropped from a high window on a tall building. (Neglect the effect air resistance.) The objects will reach the ground at the same time but object A will have a greater ___. Choose all that apply.
d. none of the above quantities will be greater
5. A 4 kg object has a momentum of 12 kg•m/s. The object's speed is ___ m/s.
a. speed
b. acceleration
c. momentum
6. Analyze the Relationships Between Variables. The first two have been done for you as examples:
Given: An object with a mass M and a velocity v has a momentum of 32 kg•m/s. An object with a mass of ...
... 2M and a velocity of 2v would have a momentum of 128 kg•m/s. (doubling mass and doubling velocity means multiply old answer by 4)
... 2M and a velocity of 0.5v would have a momentum of 32 kg•m/s. (doubling mass and halving velocity means multiply old answer by 1)
... 0.5M and a velocity of 2v would have a momentum of ____ kg•m/s.
... 0.5M and a velocity of 0.5v would have a momentum of ____ kg•m/s.
... 4M and a velocity of v would have a momentum of ____ kg•m/s.
... 4M and a velocity of 0.5v would have a momentum of ____ kg•m/s.
... 0.5M and a velocity of 4v would have a momentum of ____ kg•m/s.
... 3M and a velocity of 2v would have a momentum of ____ kg•m/s.
080B: Concept Builder: Momentum
Correctly answer 12 questions about momentum to earn all three trophies.
Paraphrase each question into your notes, then write the answer
LINK: https://www.physicsclassroom.com/Concept-Builders/Momentum-and-Collisions/Momentum/Concept-Builder
LEARNING AT HOME (HW)
1. Complete 079B The Cart and the Brick Interactive Lab due Sunday 11:59
Stuck? Here are two videos to help you through the process.
Measuring displacement and time
Use the remind app for any further questions...
2. Complete 080A and 080B from today
3. I'll use the Remind App to keep you posted regarding Monday's potential strike. Plan for the best, prepare for the worst: Plan on being in school Monday.
WARM-UP:
1. Static electricity is not always a hazard. It has many applications in everyday life. Can you think of any of these? Example: LINK
2. How can an object be charged and what effect does that charge have upon other objects in its vicinity?
CLASSWORK:
1. #079C HW Review
2. #080A: Static Electricity
- Slideshow: LINK
3. Quiz 73 (waves) grading
HOMEWORK
Laser Labs Due Friday (stuck? - here's a video to help you calculate the diameter of the hair: LINK)
1. Read: Structure of Matter LINK1 and Charging by Friction LINK2
080B: Answer questions 1-6 here: LINK
080C: Complete all the first two skill builder levels here (LINK): Make sure to use your full name, and to take a screen shot of your two trophies when you're done
The third level is extra credit :-)
Cool Video about charge in tape: https://www.youtube.com/watch?v=O7siDnbEuko