Kinematics Whiteboarding
Announcement 1. Review materials are posted for each unit! - This includes a general list of topics for the final, tutorials (short readings explaining each topic), videos (every single topic), and quiz generator for each unit (so you can test yourself!) 2. It isn’t guaranteed that I will be grading all of your finals (Goal of review is to get full credit for each problem)
* Test corrections are due today * White Boarding Marker – Please don’t waste my markers (I paid for them with my own money) Rag White Board Groups of 4 * Test corrections are due today *
Level 1 Mild
Lebron James, who has a mass of 120 kg, is running sprints Lebron James, who has a mass of 120 kg, is running sprints. When the coaches stop watch reads 3.0 seconds he is running at 4 m/s. When the coach’s stopwatch reads 4.5 s Lebron is then traveling at 6 m/s. What is the magnitude of his acceleration?
Lebron James, who has a mass of 120 kg, is running sprints Lebron James, who has a mass of 120 kg, is running sprints. When the coaches stop watch reads 3.0 seconds he is running at 4 m/s. When the coach’s stopwatch reads 4.5 s Lebron is then traveling at 6 m/s. What is the magnitude of his acceleration? Answer: 1.33 m/s2
An astronaut drops a hammer from 2 An astronaut drops a hammer from 2.0 meters above the surface of the moon. If the acceleration due to gravity on the moon is 1.62 m/s^2, how long will it take for the hammer to fall to the Moon’s surface?
An astronaut drops a hammer from 2 An astronaut drops a hammer from 2.0 meters above the surface of the moon. If the acceleration due to gravity on the moon is 1.62 m/s^2, how long will it take for the hammer to fall to the Moon’s surface? Answer: 1.6 seconds
A car initially traveling at a speed of 16 meters per second accelerates uniformly to a speed of 20 meters per second over a distance of 36 meters. What is the magnitude of the car’s acceleration?
A car initially traveling at a speed of 16 meters per second accelerates uniformly to a speed of 20 meters per second over a distance of 36 meters. What is the magnitude of the car’s acceleration? Answer: 2 m/s2
How far will a brick starting from rest fall freely in 3.0 seconds?
How far will a brick starting from rest fall freely in 3.0 seconds? Answer: 44 m
Level 2 Medium
A skater increases her speed uniformly from 2 A skater increases her speed uniformly from 2.0 meters per second to 7.0 meters per second over a distance of 12 meters. What is the magnitude of her acceleration?
A skater increases her speed uniformly from 2 A skater increases her speed uniformly from 2.0 meters per second to 7.0 meters per second over a distance of 12 meters. What is the magnitude of her acceleration? Answer: 1.875 m/s2
A rock falls from rest off a high cliff A rock falls from rest off a high cliff. How far has the rock fallen when its speed is 39.2 meters per second?
A rock falls from rest off a high cliff A rock falls from rest off a high cliff. How far has the rock fallen when its speed is 39.2 meters per second? Answer: 78.3 meters
An astronaut standing on a platform on the Moon drops a hammer An astronaut standing on a platform on the Moon drops a hammer. If the hammer falls 6.0 meters vertically in 2.7 seconds, what is its acceleration?
An astronaut standing on a platform on the Moon drops a hammer An astronaut standing on a platform on the Moon drops a hammer. If the hammer falls 6.0 meters vertically in 2.7 seconds, what is its acceleration? Answer: 1.6 m/s2
The graph to the right shows the relationship between the speed and elapsed time for an object falling freely from rest near the surface of a planet. Determine: a) The acceleration due to gravity on this planet b) Distance the ball has fallen after 3 seconds. c) Do objects on this planet appear to fall faster or slower than those on earth? Explain.
c) slower – the acceleration is less than on earth The graph to the right shows the relationship between the speed and elapsed time for an object falling freely from rest near the surface of a planet. Determine: a) The acceleration due to gravity on this planet b) Distance the ball has fallen after 3 seconds. c) Do objects on this planet appear to fall faster or slower than those on earth? Explain. a = slope = 8/3 m/s^2 = 2.67 m/s/s b) d = area = ½ (8*3)m = 12m c) slower – the acceleration is less than on earth
Level 3 Spicy
A car traveling on a straight road at 15 meters per second accelerates uniformly to a speed of 21 meters per second in 12 seconds. What is the total distance cover by the car during this interval?
A car traveling on a straight road at 15 meters per second accelerates uniformly to a speed of 21 meters per second in 12 seconds. What is the total distance cover by the car during this interval? Answer: 216m
Statistically, a person wearing a shoulder harness can survive a car crash if the acceleration is smaller than -300 m/s2. Assuming a constant acceleration, how far could the front end of a car collapse if the car impacts while going 28.0 m/s and comes to a complete stop?
Statistically, a person wearing a shoulder harness can survive a car crash if the acceleration is smaller than -300 m/s2. Assuming a constant acceleration, how far could the front end of a car collapse if the car impacts while going 28.0 m/s and comes to a complete stop? Answer: 1.3m
A 25-newton weight is thrown straight downward with a speed of 0 A 25-newton weight is thrown straight downward with a speed of 0.50 meter per second from the roof of a building. The acceleration due to gravity is 9.8 m/s2 What is the total distance the weight falls in the first 1.0 second?
A 25-newton weight is thrown straight downward with a speed of 0 A 25-newton weight is thrown straight downward with a speed of 0.50 meter per second from the roof of a building. The acceleration due to gravity is 9.8 m/s2 What is the total distance the weight falls in the first 1.0 second? Answer: 5.4m