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Transcript
Activity 77: Mass and Collisions • Warm up: what is the momentum of a tennis ball that started at a given point and was pushed backwards 48 meters in 7 seconds? The tennis ball weighs .05 kg. • What is the velocity of a bee flying at a momentum of 16 kg• m/s if it weighs 0.001 kg? Next Quiz! • Our next quiz will be Wednesday April 13th! • Activities 76 and 77 • No notecard or notebooks, please study! • 10 questions, 10 points Activity 76 Analysis Questions OneNote Practice Problems • If a car is going 100 m/s and slows down to 50 m/s in 20 seconds while traveling west, what is the car's acceleration? • Calculate the average velocity of a car that travels 556 kilometers northeast in 3.4 hours. OneNote Practice Problems • The tortoise and the hare in a road race to defend the honor of their breed. The tortoise crawls the entire 1000 m distance at a speed of 0.2 m/s while the rabbit runs the first 200 m at 2.0 m/s. The rabbit then stops to take a nap for 1.3 hours and wakes to finish the last 800 m with an average speed of 3.0 m/s. Who wins the race and by how much? OneNote Practice Problems • A track athlete throws a 2 kg discus into a field with a velocity of 21 m/s. What is the momentum of the discus? • What is the force applied to a wall if the car that hits it is 2000 kg and was moving at an acceleration of 70 m/s? Activity 76 In Case You Missed It • A force is a push or a pull. The unit for force is Newton (N). 𝑚 𝑓𝑜𝑟𝑐𝑒 𝑁 = 𝑚𝑎𝑠𝑠 𝑘𝑔 𝑥 𝑎𝑐𝑐𝑒𝑙𝑒𝑟𝑎𝑡𝑖𝑜𝑛 ( 𝑠2) Activity 76 In Case You Missed It • Impulse: a force acting over a short interval of time, such as in a car collision. • Momentum: a way to quantify the motion of an object. 𝑚𝑜𝑚𝑒𝑛𝑡𝑢𝑚 𝑘𝑔 • 𝑚 𝑠 = 𝑚𝑎𝑠𝑠 𝑘𝑔 𝑥 𝑣𝑒𝑙𝑜𝑐𝑖𝑡𝑦 (𝑚 𝑠) Activity 76 In Case You Missed It • Conservation of Momentum: if no additional forces act on an object or objects, the total momentum will stay the same. • Outside forces: air resistance, friction, gravity Activity 77: Mass and Collision • Please open your books to page E19. Activity 77: Mass and Collision • What is mass? Is it different than weight? • Mass: how much matter is in an object • Weight: the amount of gravitational force acting on an object. Activity 77: Mass and Collision • A rocket on Earth weighs 30,000 kg on Earth because of gravity. • The same rocket goes to the moon, what will happen to the mass? What will happened to the weight? • That rocket then goes to Jupiter. What would happen to its perceived weight? Its mass? Activity 77: Mass and Collision • Focus: what does the mass of the cart have to do with the force it can put on the block? • Before the activity, does the mass affect the speed of an object? • You know from the last activity that the speed can factor into how much force is put on the block. Activity 77: Mass and Collision • With your group, you will design an investigation to test the relationship between mass and force exerted by the cart. • Use the procedure in the book and the Student Sheet. • Ms. Pyle must see your experimental design before you begin collecting data! Activity 77: Mass and Collision • Using the data you collected, what was the relationship between the mass of the cart and the force it exerted on the block? Activity 77 Analysis Jigsaw • Each person at your table will get 1-2 analysis questions to work on. • When Ms. Pyle says, share your answers with each other, teaching one another why your answer is what it is. • As other people at your table are talking, write their answer in your OneNote notebook. Tonight’s Homework • Study for quiz on Tuesday! • Activities 76 and 77.