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301 Chapter Outline and Problems Section 1 (23pts)
- Write all answers in your bound journal
- Make it NEAT and in COMPLETE SENTENCES, clearly identify which section you are working (using numbers)
- Box final answers if doing math.
- -4pt if you do not title and date the entry
- -1pt (per infraction) if you do not clearly identify the sections, or number the problems
- Why does Newton win against the elephant every time?
- Why does Newton accelerate more?
- What is Newton's First law?
- What is Newton's Second law?
- What is Newton's Third law?
- What are the action and reaction forces in regard to the skateboarder?
- Why do action and reaction forces not cancel out?
- What are the five guidelines to help you sort out action and reaction forces?
- What is momentum (p)?
- What is the equation and the units for momentum?
- What is the momentum of a 40kg skateboarder moving at 10m/s (SHOW YOUR MATH)?
- What is impulse?
- What is the equation used to determine impulse?
- What are the units for impulse?
- What impulse is needed to hit a stationary 0.1kg tennis ball to a velocity of 30m/s (SHOW YOUR MATH)?
- A net force of 100 N is applied for 5 seconds to a 10-kg car that is initially at rest.
What is the speed of the car at the end of the 5 seconds (SHOW YOUR MATH)?
- A 15-N force acts for 10 seconds on a 1-kg ball initially at rest. What is the ball’s final momentum (SHOW YOUR MATH)?
- How much time should a 100-N force take to increase the speed of a 10-kg car from 10 m/sec to 100 m/sec (SHOW YOUR MATH)?
- What does the the law of conserved momentum mean? (use the skateboarder throwing the ball to explain)
- When you jump up, what happens to the earth?
- An astronaut floating in space throws a 2-kilogram hammer to the left at 15 m/sec.
If the astronaut’s mass is 60 kilograms, how fast does the astronaut move to the right after throwing
the hammer (SHOW YOUR MATH)?
- Two children on ice skates start at rest and push off from each other. One has a mass of 30 kg and moves back at 2 m/sec.
The other has a mass of 15 kg. What is the second child’s speed (SHOW YOUR MATH)?
- Standing on an icy pond, you throw a 0.5 kg ball at 40 m/sec. You move back at 0.4 m/sec. What is your mass (SHOW YOUR MATH)?
p = mv
p = 0.1kg * 30m/s
p = 3kg*m/s
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impulse = force * time = change in momentum;
momentum = mass × velocity.
~~~~ Mass * Velocity = Force * Time
~~~~ 10kg * ? m/s = 100N * 5seconds
~~~~ ? m/s = (100N * 5sec)/ 10kg
~~~~ 50m/s
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~~~~ Mass * Velocity = Force * Time ~~~~
~~~~ 1kg * ? m/s = 15N * 10seconds
~~~~ ? m/s = (15N * 10sec)/ 10kg
~~~~ 15m/s = velocity
~~~~ p = mv
~~~~ p = 15m/s * 10kg
~~~~ p = 150kg*m/s
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~~~~ Ft = MV2 - MV1 ~~~~
~~~~ 100N * ? sec = (10kg * 100m/s) - (10kg * 10m/s)
~~~~ 100N * ? sec = 900kg*m/s
~~~~ ? sec = (900kg*m/s)/100N
~~~~ 9 sec
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~~~~ MaVa = MhVh ~~~~
~~~~ 60kg * ? m/s = 2kg * 15m/s
~~~~ ? m/s = (2kg * 15m/s)/60kg
~~~~ 0.5m/s away from the hammer
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~~~~ M1V1 = M2V2 ~~~~
~~~~ 30kg * 2 m/s = 15kg * ?m/s
~~~~ (30kg * 2 m/s)/ 15kg = ?m/s
~~~~ 4m/s away from the hammer
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~~~~ M1V1 = M2V2 ~~~~
~~~~ 0.5kg * 40 m/s = ?kg * 0.4m/s
~~~~ (0.5kg * 40 m/s)/ 0.4m/s = ?kg
~~~~ 50kg
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