Goals: SWBAT...
1. Get a 4 on the quiz
2. To observe patterns in a collision between two objects, and to develop a rule for predicting the post-collision velocity of the two objects.
Warm-Up (5min):
Golf. When a golf club hits a golf ball, which experiences a larger force, club or ball?
Pool. When a cue ball hits the 8-ball, which experiences a larger force cue ball or 8 ball?
Figure Skating: Consider the interaction between a male and female figure skater in pair figure skating. A woman (m = 45 kg) is kneeling on the shoulders of a man (m = 70 kg); the pair is moving along the ice at 1.5 m/s. The man gracefully tosses the woman forward through the air and onto the ice. The woman receives the forward force and the man receives a backward force. Which force is larger? Who experiences a larger velocity change?
CLASSWORK
1. 084A: Quiz 1: Momentum and Impulse
- Kiosk App
2. 084B: Notebook Check.
- be prepared to show me Day 76-83.
- please know where each day is (they should be labeled). If you can't find the assignments I'm looking for, I'll send you off to get organized...
- We'll do another notebook check for Day 84-94
3. 083B (continued) Fish Catch Interactive
Copy, then complete the sentence. Before the collision, only one of two objects is moving. All the momentum of the system resides in a single object before the collision. After the collision, both objects move together at the same _______ as if they were a single ________.
In this activity, you will attempt to develop a mathematical rule for predicting the postcollision velocity for any collision that possesses this characteristic. You will attempt to develop the rule in the form of an equation that states the post-collision velocity (vf) as a function of the pre-collision velocity (vi) and the masses of the moving (m1) and the stationary (m2) objects.
Instructions/Handout Link: https://www.physicsclassroom.com/getattachment/Physics-Interactives/Momentum-and-Collisions/Fish-Catch/Fish-Catch-Exercise/FischCatchActivity.pdf?ext=.pdf
Copy the data table into your notes, then use the interactive to collect data. Once you have all the data, create a rule (equation) relating the qualities described in the paragraph above.
Interactive Link: https://www.physicsclassroom.com/Physics-Interactives/Momentum-and-Collisions/Fish-Catch/Fish-Catch-Interactive
3. 084C: Practice Problems
Your brother’s mass is 35.6 kg, and he has a 1.3-kg skateboard. What is the combined momentum of your brother and his skateboard if they are moving at 9.50 m/s?
Determine the momentum of a 60-kg halfback moving eastward at 9 m/s.
A car possesses 20,000 units of momentum. What would be the car's new momentum if it's velocity is tripled?
Learning at Home/HW
Complete the Classwork
084C:
Watch the following, take notes, and answer the Edpuzzle questions so you can be ready for next week. Enjoy the Nerd-A-Pult :-)
Edpuzzle Video: https://edpuzzle.com/media/588649e2fc574b49613432dc
084A: Quiz today
When you turn in your quiz, turn in (show me) your homework as well, then begin the warm up and classwork
#Goals: SWBAT...
1. Explore how being at rest affects momentum
2. Use the impulse-momentum equation to solve momentum/impulse problems.
Warm-Up (6min):
Recall: Impulse = F • t & Change in Momentum = m • ∆v
Impulse = Change in Momentum so.... F • t = m • ∆v
Momentum(1min): Is the momentum of a car traveling south different from that of the same car when it travels north at the same speed? Draw a sketch of cars with momentum vectors to support your answer.
Momentum(1min): Which has more momentum, a supertanker tied to a dock or a falling raindrop?
Impulse and Momentum(4min): A 0.174-kg softball is pitched horizontally at 26.0 m/s. The ball moves in the opposite direction at 38.0 m/s after it is hit by the bat.
Draw arrows showing the ball’s momentum before and after the bat hits it?
What is the change in momentum of the ball?
What is the impulse delivered by the bat?
If the bat and softball are in contact for 0.80 ms, what is the average force that the bat exerts on the ball? NOTE: ms means millisecond 1s=1000ms
CLASSWORK:
#084B: Impulse/Change in Momentum Practice Problems
A 240.0-kg snowmobile accelerates, which results in a force being exerted that speeds up the snowmobile from 6.00 m/s to 28.0 m/s over a time interval of 60.0 s.
A. Sketch the event, showing the initial and final situations.
B. What is the snowmobile’s change in momentum? What is the impulse on the snowmobile?
C. What is the magnitude of the average force that is exerted on the snowmobile?
A 2200-kg vehicle traveling at 94 km/h (26 m/s) hits a concrete wall. Suppose a 60kg person is driving the car. The velocity of the person equals that of the car both before and after the crash, and the velocity changes in 0.20 s. Sketch the problem.
A. What is the average force exerted on the person?
B. Some people think that they can stop their bodies from flying forward in a vehicle that is crashing by putting their hands on the dashboard. Find the mass of an object that has a weight equal to the force you just calculated. Could you lift such a mass? Are you strong enough to stop your body with your arms?
Learning at Home (HW)
- complete 084B
- 084C: take notes, and answer edpuzzle questions
WARM-UP
Draw the positively charged puck, and the goal. Then draw in one positive or negative charge in the correct location so the puck would go in the goal
CLASSWORK
084A: HW Review
084B: Coulombs Law - where does it come from?
Interactive Sim: http://www.physicsclassroom.com/Physics-Interactives/Static-Electricity/Coulomb-s-Law/Coulomb-s-Law-Interactive
084C: Electric Field Lines Preview/Inquiry
Interactive/Sim: http://www.physicsclassroom.com/Physics-Interactives/Static-Electricity/Electric-Field-Lines/Electric-Field-Lines-Interactive
HOMEWORK
Still struggling with Coulomb's Law? Here's some help: Video LINK
1. If you didn't finish them in class, complete 084B and 084C
2. Electric Field Video: LINK
Video Questions
Are electric field lines visible? Which other force(s) are invisible?
If you put a negatively charged particle inside an electric field, and it accelerates away, is it experiencing a force? What kind of force?
What kind of charge would be present to cause the negative charge to accelerate away?
Draw a positive particle. Which way will the field lines point? Draw them
Use our new equation for force (F=qE) to solve the proton problem with Mr. Andersen
In a similar fashion, solve the electron problem presented at 4:45