Drive and Motion .


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Segment 4.1: Force and Net Force. 2. Area 4.2: Inertia and Newton\'s First Law of Motion. Without a lopsided power (Fnet=0), a body very still stays very still, and a body in movement stays in movement with consistent speed (steady speed and direction)This law is now and again called the Law of Inertia..
Transcripts
Slide 1

Part 4 Force and Motion

Slide 2

Section 4.1: Force and Net Force

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Section 4.2: Inertia and Newton\'s First Law of Motion without an uneven constrain (F net =0), a body very still stays very still, and a body in movement stays in movement with consistent speed (steady speed and bearing) This law is some of the time called the Law of Inertia.

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Section 4.3: Newton\'s Second Law of Motion The increasing speed of a protest is corresponding to the drive following up on it and contrarily relative to its mass.

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Section 4.4: Newton\'s Third Law of Motion For each compel there is an inverse and equivalent response.

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Free Body Diagrams Blocks Examples

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Sledding down a slope (skip for Phys 100) A tyke and sled with a joined mass of 56.0 kg slide down a frictionless slope that is 8.52 m high at a point of 37 degrees from flat. In the event that the sled begins from rest, what is its speed at the base of the slope?

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Elevator Physics 1 "You are remaining on a lavatory scale in a lift. You are holding an apple. (Yes, individuals are gazing at you...) You measure 500 Newtons, so your mass is around 50 kg."

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Elevator Physics 2 Part An: Elevator Is At Rest. You have recently boarded the lift, so it (with you inside) is very still... Address #1: What does the scale read? Reply: There are 2 powers following up on you. (See the outline at right.) The Earth pulls down on you with the compel we call your weight (= mg) of 500 Newtons. The other constrain is the ordinary compel from the scale. Since the lift is very still, your speeding up is 0 m/s 2 . Since your increasing speed is 0 m/s 2 , Newton\'s First Law says the net compel on you should be 0 Newtons. Since the net constrain on you is 0 Newtons, the upward powers and descending strengths on you should adjust precisely. Along these lines the scale must push on you with a compel of 500 Newtons, and the scale must read 500 Newtons. Address #2: If you let go of the apple, what does it do? Reply: The apple would be in free fall, so its increasing speed in respect to the earth is 10 m/s 2 descending. Since you are very still with respect to the earth, the apple\'s increasing speed in respect to you would be 10 m/s 2 additionally, so the apple would seem to fall similarly as it does anyplace else on the earth.

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Elevator Physics 3 Part B: The Elevator Accelerates Upward. The lift, (with you inside) starts to quicken upward from rest at 2 m/s 2 . Address #3: What will the scale read now? Reply: There are 2 strengths following up on you. Your weight pulls down with a drive of 500 Newtons. The other compel is the ordinary drive from the scale. Your speeding up is 2 m/s 2 upward, Newton\'s Second Law says that there must be a net compel pushing you upward, and the net drive has an extent F net = mama. So the net drive on you, F net = (50 kg)(2 m/s 2 ) = 100 Newtons (upward). Since the net drive on you is 100 Newtons, the upward strengths and descending powers on you should wipe out to leave a 100 Newton upward constrain. Hence the scale must push on you with a constrain of 600 Newtons, and the scale must read 600 Newtons as the lift quickens upward. Address #4: If you let go of the apple now, what does it do? Reply: The apple would be in free fall, so its speeding up with respect to the earth is 10 m/s 2 descending. Since you are quickening at 2 m/s 2 upward with respect to the earth, the apple\'s increasing speed in respect to you would be 10 m/s 2 + 2 m/s 2 = 12 m/s 2 , so the apple would seem to fall quicker inside the lift than it does in "normal" free fall on the earth. To the inhabitants of the upwardly quickening lift, it gives the idea that gravity is more grounded , since they appear to measure more and items fall speedier than "normal."

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Elevator Physics 4 Part C: The Elevator Moves Up With Constant Velocity. The lift (and you) quickened for 5 seconds, so it is moving upward with a speed of 10 m/s. It now moves with this consistent upward speed of 10 m/s. Address #5: What does the scale read now? Reply: There are 2 strengths following up on you. Your weight pulls down with a compel of 500 Newtons. The other drive is the ordinary compel from the scale. Since the lift is moving with consistent speed, your increasing speed is 0 m/s 2 . Since your speeding up is 0 m/s 2 , Newton\'s First Law says the net constrain on you is 0 Newtons. Since the net drive on you is 0 Newtons, the scale must push on you with a constrain of 500 Newtons, and the scale must read 500 Newtons. Address #6: If you let go of the apple, what does it do? Reply: The apple has no speeding up in respect to you. So its quickening in respect to the earth is 10 m/s 2 descending. Since you are moving at a consistent speed in respect to the earth, the apple\'s quickening with respect to you would be10 m/s 2 additionally, so the apple would seem to fall similarly as though you were very still.

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Elevator Physics 5 Part D: The Elevator Slows Down (While Going Up) The lift, (with you inside) starts to back off as it methodologies its goal. Its increasing speed (or deceleration) is 2 m/s 2 descending . Address #7: What does the scale read now? Reply: There are 2 powers following up on you. The Earth (your weight) pulls down with a drive of 500 Newtons. The other compel is the typical constrain from the scale. Since your speeding up is 2 m/s 2 descending, Newton\'s Second Law says that there must be a net compel pulling you descending, and the net constrain has an extent F net = mama. So the net compel on you, F net = (50 kg)(2 m/s 2 ) = 100 Newtons (descending). Since the net drive on you is 100 Newtons descending, the upward strengths and descending powers on you should offset to leave a 100 Newton descending power. Subsequently the scale must push on you with a drive of 400 Newtons, and the scale must read 400 Newtons as the lift quickens descending. Address #8: If you let go of the apple now, what does it do? Reply: The apple would be in free fall, so its quickening in respect to the earth is 10 m/s 2 descending. Since you are quickening at 2 m/s 2 descending in respect to the earth, the apple\'s speeding up with respect to you would be 10 m/s 2- - 2 m/s 2 = 8 m/s 2 , so the apple would seem to fall slower inside the lift than it does in "normal" free fall on the earth. To the tenants of the downwardly quickening lift, it creates the impression that gravity is weaker , since they appear to measure less and objects fall more gradually than "normal."

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Elevator Physics 6 Part E: The Elevator Speeds Up (While Going Down) The lift, (with you inside) achieves its floor, stops for some time, and afterward starts to quicken descending. Its speeding up is 2 m/s 2 descending. Address #9: What does the scale read now? Reply: There are 2 powers following up on you. The Earth (your weight) pulls down with a compel of 500 Newtons. The other compel is the ordinary drive from the scale. Since your increasing speed is 2 m/s 2 descending, Newton\'s Second Law says that there must be a net drive pulling you descending, and the net compel has an extent F net = mama. So the net compel on you, F net = (50 kg)(2 m/s 2 ) = 100 Newtons .(descending) Since the net drive on you is 100 Newtons descending, the upward strengths and descending powers on you should offset to leave a 100 Newton descending power. Thusly the scale must push on you with a compel of 400 Newtons, and the scale must read 400 Newtons as the lift quickens descending. Address #10: If you let go of the apple now, what does it do? Reply: The apple would be in free fall, so its speeding up with respect to the earth is 10 m/s 2 descending. Since you are quickening at 2 m/s 2 descending in respect to the earth, the apple\'s increasing speed with respect to you would be 10 m/s 2- - 2 m/s 2 = 8 m/s 2 , so the apple would seem to fall slower inside the lift than it does in "normal" free fall on the earth. To the inhabitants of the downwardly quickening lift, it gives the idea that gravity is weaker , since they appear to measure less and objects fall more gradually than "normal."

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Elevator Physics 7 Part F: The Elevator Moves Down With Constant Velocity. The lift (and you) quickened for 5 seconds, so it is moving descending with a speed of 10 m/s. It now moves with this steady descending speed of 10 m/s. Address #11: What does the scale read now? Reply: There are 2 strengths following up on you. (Finish the chart.) Your weight pulls down with a compel of 500 Newtons. The other constrain is the typical compel from the scale. Since the lift is moving with steady speed, your increasing speed is 0 m/s 2 . Since your increasing speed is 0 m/s 2 , Newton\'s First Law says the net compel on you is 0 Newtons. Since the net compel on you is 0 Newtons, the scale must push on you with a constrain of 500 Newtons, and the scale must read 500 Newtons. Address #12: If you let go of the apple, what does it do? Reply: The apple has no speeding up with respect to you. So its quickening in respect to the earth is 10 m/s 2 descending. Since you are moving at a steady speed with respect to the earth, the apple\'s increasing speed in respect to you would be10 m/s 2 likewise, so the apple would seem to fall similarly as though you were very still.

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Elevator Physics 8 Part G: Oh, No! The lift link snaps, and the lift (with you inside!) starts to fall! Maybe you have time for one final Physics perception! Address #13:What does the scale read as the lift falls? Reply: There are 2 powers following up on you. The Earth (your weight) pulls down with a drive of 500 Newtons. The other constrain is the typical drive from the scale. Since the lift and you are in free fall, your speeding up is 10 m/s 2 descending. Newton\'s Second Law says that there must be a net drive pulling you descending, and the net constrain has an extent F net = mama. So the net compel on you, F net = mama = (50 kg)

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