HOMEWORK FOR UNIT 5-1: FORCE AND MOTION

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1 Nam Dat Partnrs HOMEWORK FOR UNIT 51: FORCE AND MOTION 1. You ar givn tn idntial springs. Dsrib how you would dvlop a sal of for (i., a mans of produing rpatabl fors of a varity of sizs) using ths springs. 2. Dsrib how you would us a for prob and th springs in (1) to dvlop a quantitativ sal of for. 3. What is mant by a proportional rlationship? Is this th sam as a linar rlationship? Explain. 4. Givn th tabl of data blow for widgts and doodads, how would you dtrmin if th rlationship btwn widgts and doodads is a proportional on? Skth on th axs on th right of th tabl what th graph would look lik if widgts ar proportional to doodads. widgts doodads 1993 Dikinson Collg, Tufts Univrsity, Univrsity of Orgon

2 For Pag H42 V1.21β8/11/93 Ral Physis: Ativ Larning Laboratory 5. A for is applid whih maks an objt mov with th alration shown blow. Assuming that frition is ngligibl, skth a fortim graph of th for on th objt on th axs blow. Alration Explain your answr: (s) 6. Roughly skth th vloitytim graph for th objt in qustion 5 on th axs blow. Vloity (s) 7. A art an mov along a horizontal lin (th position axis). It movs with th vloity shown blow. Vloity (s) 1993 Dikinson Collg, Tufts Univrsity, Univrsity of Orgon

3 Ral Physis: Homwork for Lab 4: For and Motion Pag H43 Authors: David Sokoloff, Ronald Thornton & Prisilla Laws V1.21β8/11/93 Assuming that frition is so small that it an b ngltd, skth on th axs that follow th alrationtim graph of th art s motion. Alration (s) Skth on th axs blow th for whih must at on th art to kp it moving with this vloity and alration. (Rmmbr that frition is ngligibl.) For (s) Explain both of your graphs. Qustions 81 rfr to an objt whih an mov in ithr dirtion along a horizontal lin (th position axis). Assum that frition is so small that it an b ngltd. Skth th shap of th graph of th for applid to th objt whih would produ th motion dsribd. 8. Th objt movs away from th origin with a onstant vloity. For 9. Th objt movs toward th origin with a onstant vloity. For 1993 Dikinson Collg, Tufts Univrsity, Univrsity of Orgon

4 For Pag H44 V1.21β8/11/93 Ral Physis: Ativ Larning Laboratory 1. Th objt movs away from th origin with a stadily inrasing vloity (a onstant alration). For Qustions 1112 rfr to an objt whih an mov along a horizontal lin (th position axis). Assum that frition is so small that it an b ignord. Th objt's vloitytim graph is shown on th right (s) Vloity 11. Skth th shaps of th alrationtim and fortim graphs on th axs blow. Alration (s) 12. Suppos that th for applid to th objt wr twi as larg. Skth with dashd lins on th sam axs abov th for, alration and vloity Dikinson Collg, Tufts Univrsity, Univrsity of Orgon

5 For Ral Physis: Homwork for Lab 4: For and Motion Pag H45 Authors: David Sokoloff, Ronald Thornton & Prisilla Laws V1.21β8/11/93 Qustions 13 rfrs to an objt whih an mov along a horizontal lin (th position axis). Assum that frition is so small that it an b ignord. Th objt's vloitytim graph is shown on th right. Vloity (s) 13. Skth th shaps of th alration and for graphs on th axs blow. Alration (s) 1993 Dikinson Collg, Tufts Univrsity, Univrsity of Orgon

6 Nam Dat Partnrs HOMEWORK FOR UNIT 52: COMBINING FORCES Qustions 15 rfr to a toy ar whih an mov in ithr dirtion along a horizontal lin (th position axis). Assum that frition is so small that it an b ignord. Skth th shap of th graph of th applid for whih would kp th ar moving as dsribd in ah statmnt. 1. Th toy ar movs away from th origin with a onstant vloity. F o r 2. Th toy ar movs toward th origin with a onstant vloity. F o r 3. Th toy ar movs away from th origin with a stadily drasing vloity (a onstant alration). F o r 4. Th toy ar movs away from th origin, spds up and thn slows down. F o r 1993 Dikinson Collg, Tufts Univrsity, Univrsity of Orgon

7 Pag H52 Ral Physis: Ativ Larning Laboratory V1.21β8/11/93 5. Th toy ar movs toward th origin with a stadily inrasing vloity (a onstant alration). F o r 6. Th toy ar is givn a push away from th origin and rlasd. It ontinus to mov with a onstant vloity. Skth th for aftr th ar is rlasd. F o r 7. A art is moving toward th right and spding up, as shown in th diagrams blow. Draw arrows abov th art rprsnting th magnituds and dirtions of th nt (ombin) fors you think ar ndd on th art at t = s, t = 1 s, t. to maintain its motion with a stadily inrasing vloity. Explain th rasons for your answrs. 8. If th positiv dirtion is toward th right, what is th sign of th for at t = 2 s in qustion 7. Explain Dikinson Collg, Tufts Univrsity, Univrsity of Orgon

8 Ral Physis: Homwork for Lab 5: Combining Fors Pag H53 Authors: David Sokoloff, Ronald Thornton & Prisilla Laws V1.21β8/11/93 9. A art is moving toward th right and slowing down, as shown in th diagrams blow. Draw arrows abov th art rprsnting th magnituds and dirtions of th nt(ombind) fors you think ar ndd on th art at t = s, t = 1 s, t. to maintain its motion with a stadily drasing vloity. Explain th rasons for your answrs. 1. If th positiv dirtion is toward th right, what is th sign of th for at t = 2 s in qustion 9? Explain. 11. A toy ar an mov in ithr dirtion along a horizontal lin (th position axis). Assum that frition is so small that it an b ignord. A for toward th right of onstant magnitud is applid to th ar. Skth on th axs blow using a solid lin th shap of th alrationtim graph of th ar. A l Explain th shap of your graph in trms of th applid for Dikinson Collg, Tufts Univrsity, Univrsity of Orgon

9 Pag H54 Ral Physis: Ativ Larning Laboratory V1.21β8/11/93 In qustions 1215, assum that frition is so small that it an b ignord. 12. Th spring sal in th diagram blow rads 1.5 N. Th art movs toward th right with an alration toward th right of 3.25 m/s/s. Now two fors ar applid to th art with two diffrnt spring sals as shown blow. Th spring sal F 1 still rads 1.5 N. Th art now movs toward th right with an alration toward th right of 5.5 m/s/s. What dos spring sal F 2 rad? Show your alulations, and xplain. 13. Now two fors ar applid to th art with two diffrnt spring sals as shown blow. Th spring sal F 1 still rads 1.5 N. Th art now movs toward th right with an alration toward th right of 2.5 m/s/s. What dos spring sal F 2 rad? Show your alulations, and xplain. 14. Again two fors ar applid to th art with two diffrnt spring sals as shown blow. Th spring sal F 1 still rads 1.5 N. Th art movs with a onstant vloity toward th right. What dos spring sal F 2 rad? Show your alulations, and xplain Dikinson Collg, Tufts Univrsity, Univrsity of Orgon

10 Ral Physis: Homwork for Lab 5: Combining Fors Pag H55 Authors: David Sokoloff, Ronald Thornton & Prisilla Laws V1.21β8/11/ Again two fors ar applid to th art with two diffrnt spring sals as shown blow. Th spring sal F 1 still rads 1.5 N. Th art movs toward th lft with an alration toward th lft of 2.5 m/s/s. What dos spring sal F 2 rad? Show your alulations, and xplain Dikinson Collg, Tufts Univrsity, Univrsity of Orgon

11 Nam Dat Partnrs HOMEWORK FOR UNIT 53: FORCE, MASS AND ACCELERATION 1. Givn th tabl of data blow for widgts and doodads, how would you dtrmin if th rlationship btwn widgts and doodads is an invrsly proportional on? Skth on th axs on th right of th tabl what th graph would look lik if widgts ar invrsly proportional to doodads, and writ th form of th quation whih rlats widgts to doodads in this as. Qustions 23 rfr to a toy ar whih an mov in ithr dirtion along a horizontal lin (th position axis). Assum that frition is so small that it an b ignord. A for toward th right of onstant magnitud is applid to th ar. 2. Skth on th axs blow using a solid lin th shap of th alrationtim graph of th ar. A l 3. Suppos that th mass of th ar wr twi as larg. Th sam onstant for is applid to th ar. Skth on th axs abov using a dashd lin th alrationtim graph of th ar. Explain any diffrns in this graph ompard to th alrationtim graph of th ar with th original mass Dikinson Collg, Tufts Univrsity, Univrsity of Orgon

12 Pag H62 Ral Physis: Ativ Larning Laboratory V1.21β8/11/93 4. Whn a for is applid to an objt with mass qual to th standard kilogram, th alration of th mass is 3.25 m/s/s. (Assum that frition is so small that it an b ignord.) Whn th sam magnitud for is applid to anothr objt, th alration is 2.75 m/s/s. What is th mass of this objt? What would th objt's alration b if a for twi as larg wr applid to it? Show your alulations. 5. Givn an objt with mass qual to th standard kilogram, how would you dtrmin if a for applid it has magnitud just qual to on nwton? (Assum that frition is so small that it an b ignord.) 6. Why is it nssary to alibrat th for prob? Dsrib how this is don. In qustions 7, assum that frition is so small that it an b ignord. 7. Th spring sal in th diagram blow rads 1.5 N. If th art movs toward th right with an alration toward th right of 3.25 m/s/s, what is th mass of th art? Show your alulations, and xplain. In qustions 81, frition may not b ignord. 8. Th for applid to th art in (7) by spring sal F 1 is still 1.5 N. Th art now movs toward th right with a onstant vloity. What ar th magnitud and dirtion of th fritional for. Show your alulations and xplain. 9. Th for applid to th art in (7) by spring sal F 1 is still 1.5 N. Th art now movs toward th right with an alration toward th right of 1.75 m/s/s. What ar th magnitud and dirtion of th fritional for. Show your alulations and xplain Dikinson Collg, Tufts Univrsity, Univrsity of Orgon

13 Ral Physis: Homwork for Lab 6: For, Mass and Alration Pag H63 Authors: David Sokoloff, Ronald Thornton & Prisilla Laws V1.21β8/11/93 1. Th for applid to th art by spring sal F 1 is 1.5 N. Th art now movs toward th right with a onstant vloity. Th fritional for has th sam magnitud as in (9). What dos spring sal F 2 rad? Show your alulations, and xplain Dikinson Collg, Tufts Univrsity, Univrsity of Orgon

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