Momentum & Energy

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Momentum & Energy

Mr. B's Physics Web Site

San Marcos High School, Home of the ROYALS!

The following table lists the daily topics, classroom activities, and homework for the fourth unit on Work and Energy.

Date	Topic	Activity	Personal Growth Time
2/24/2009 Tuesday	Momentum Impulse	Impulse-Momentum Theorem Notes Video	Pg 201 3-5 Ch 6 3, 5-7, 9-13
2/25/2009 Wednesday	Impulse	Impulse Problems F vs. t graphs	Read 6-2 Ch 6 15-21
2/26/2009 Thursday	Conservation of Momentum	PP 7-1 Conservation of Momentum Problems	Pg 209 1-2, 4 Pg 211 2
2/27/2009 Friday	Collisions	Car Crash Video Inelastic Collisions	"Fun" Internet Collision Simulation "Real" Internet Collision Simulation Ch 6 30a, 31a
3/2/2009 Monday	Collisions	Elastic Collisions	Ch 6 24-25, 27, 32a, 34
3/3/2009 Tuesday	Energy	Ball/Hill Activity Kinetic/Potential Energy Notes	Read 164-165 166 1-4 Read 169-top of 170 172 3a 172 SR 1, 3-4
3/4/2009 Wednesday	Conservation of Energy	Conservation of Energy Problems PP 8-1	Read 5-1 162 1-2, 4 163 1-2, 6 Ch 5 1-3, 5, 9
3/5/2009 Thursday	Conservation of Energy	Pendulum Problem 177 1-2	Read 5-3 Ch 5 26, 28, 30-31, 33 177 3, 5
3/6/2009 Friday	Work-Energy Theorem	Simple Machines Braking Distances Review Sheet	Write responses to test objectives
3/9/2009 Monday	Assessment	Momentum & Energy Test	Put homework packet together Read 7-2
3/10/2009 Tuesday	Test Corrections	Gravitational Force	242 2-3 Ch 7 12-14, 17-18

Impulse Problems

Use to solve the following problems. SHOW ALL WORK!

1. Presidential limousines are armored to protect their occupants. Due to the additional mass, the engine and brake parts must be modified to allow the car to perform normally. President Bush’s limo has a mass of 6.00·10³ kg and is accelerated by a force of 8.00·10³ N over a time of 8.00 s. Assuming the limo started at rest, what is the momentum of the limo after acceleration? What is the velocity of the limo? Express this velocity in mi/hr.

2. At over 300. m, the Library Tower in Los Angeles is the tallest building in California. In order forn employees to reach the upper levels in a reasonable time the elevators must travel 12.5 m/s. Suppose a passenger with a mass of 70.0 kg enters the elevator and it accelerates for 4.00 s before reaching top speed. What is the net force applied to the passenger during the acceleration?

3. In the movie Back to the Future, Marty McFly travels back to 1955 in a 1980 DeLorean. After time transport Marty crashes the DeLorean into a barn and haystack. Suppose the combined mass of Marty and the DeLorean was 1600. kg and they were traveling 88.0 mi/hr when they impacted the haystack and barn door. If the haystack brought the DeLorean to a rest in 2.1 s, then what was the force applied to the car by the barn and haystack? (HINT: first convert velocity to m/s)

4. The human head can withstand forces in excess of 1000. N. Suppose a 0.20 kg baseball thrown by Randy Johnson strikes a batter in the head traveling 100. mi/hr. If the ball strikes the batter in the helmet and comes to rest in 0.01 s, then what is the force applied by the ball? Without the helmet, the ball would come to a rest in 0.001 s. What is the force applied to the head without the helmet? What does the helmet do to protect the batter? (HINT: first convert velocity to m/s)

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Last modified: August 26, 2007