Homework Due

Read and study 6.1-6.4; DO #1-8 p.83

Tonight’s HW

TEST next class, Ch 4-5-6*If you are absent for test day, you will take the test DURING CLASS upon your return (Monday for B day, Tues. for A Day)Study your…• 1st Law quiz•2nd Law quiz•3rd Law packet and today’s Do Now •There is a review PowerPoint on my website

Do Now 1. Take a Do Now 2. Take a clicker. 3. 5 minutes to complete Do Now - then we are

rapidly doing a clicker review of it!

Buzz in when you are done with the Do Now…

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1. I’m done!!!

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1a. Bob and Sally are the same mass. They are standing on frictionless ice. If they push each other, which person experiences the larger FORCE?

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0% 0%0%0%

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1. Bob2. Sally3. Same force4. Not quite sure

1b. Bob and Sally are the same mass. They are standing on frictionless ice. If they push each other, which person experiences the larger ACCELERATION?

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0% 0%0%0%

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1. Bob2. Sally3. Same acceleration4. Not quite sure

2a. Bob and Sally are standing on frictionless ice. Bob has GREATER MASS than Sally.If they push each other, which person experiences the larger FORCE?

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0% 0%0%0%

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1. Bob2. Sally3. Same force4. Not quite sure

2b. Bob and Sally are standing on frictionless ice. Bob has GREATER MASS than Sally. If they push each other, which person experiences the larger ACCELERATION?

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0% 0%0%0%

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1. Bob2. Sally3. Same acceleration4. Not quite sure

3a. Earth and the moon are “connected” to each other by a gravitational force. If the action force is Earth pulling on the moon, what is the reaction force?

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0% 0% 0%0%0%0%

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1. Gravity pulling moon2. Sun pulling moon 3. Earth pulling moon4. Moon pulling Earth 5. Answer isn’t up here6. Not quite sure

3b. Earth and the moon are “connected” to each other by a gravitational force. Which is the greater force: moon pulling on the Earth, or Earth pulling on the moon?

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0% 0% 0%0%0%

1. Moon pulling Earth 2. Earth pulling moon3. They are the same

force4. Answer isn’t up here5. Not quite sure

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Quiz – make corrections! Ask for clarification! When done, work on POGIL… check in and/or borrow key

1. B2. C3. C4. D5. D

6. F7. F8. C 9. B

No, you cannot conclude that no forces are acting on the moving object… you can only conclude that any forces acting on it cancel for a net force of zero. If it is moving and has no acceleration, this means the velocity is constant – which, according to either the 1st or 2nd laws, means the net force is zero.

HW– make corrections! Ask for clarification! 1. Yes – a force is exerted on the nail. An equal force is on

the hammer. There is a PAIR (2) forces.2. Equal3. You push back on floor, floor pushed forward on you…this

is why it’s easier to walk on a surface with more friction (ex – sidewalk vs ice)

4. Water pushes you forward5. Arrow pushing on bowstring6. The Earth’s mass is MUCH larger than yours7. Cannon Cannon ball [same force, but cannon has much less acceleration]

ma = F = ma

8. Rocket pushes gas back, gas pushes rocket forward