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# Translational & Rotational Homework

Date post: 05-Feb-2016
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Translational & Rotational Homework. 1. ANSWER: 48.7 N @ 70  1.91 m to right of pivot pt. GOT IT!. Show me. 30N. Where to put it:. ROTATIONAL:. 42 . 50 . 10N. 10N. 1. 48.7 N. 20.1 22.3. 38.6 46.0. 70 °. TRANSLATIONAL:. - PowerPoint PPT Presentation
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GOT IT! Show me

30N

4250

10N 10N

1.

20.1

22.3

38.6

46.0

TRANSLATIONAL:

Need :45.9 up

16.3 right

45.9

16.3

48.7 N @ 70°

ROTATIONAL:

10(7) = 70 CCW

20.1(5)= 101 CW

10(3.5)= 35 CCW

46(2) = 92 CW

NET = 88 Nm CW

48.7 N

70°

Where to put it:

= F d

88 = 45.9 dOnly the part causes torque!

1.91 m = dYou need CCW….so think if it should be 1.91 meters to left or right!

Need : 88 Nm CCW

GOT IT! Show me

700 N

78

55

2. All angles of a triangle add to 180

47

55

55

800

T?

CW = CCW sin55(800)(2.5)+ sin55(700)(5) = sin47(T)(5)

1638 + 2867 = 3.657 T

1230 N = T

GOT IT! Show me

3.

3050 65

Break the forces into components

11

19.1

7.71

9.19

18.1

8.45

TRANSLATIONAL: ROTATIONAL: Where to put it:

Need : 16.3 down

2.94 left

16.6 N @ 80

2.94

16.3

11(2) = 22.0 CCW

9.19(.5) = 4.6 CW

18.1(2) = 36.2 CCW

NET = 53.6 Nm CCW

Need: 53.6 Nm CW

= F d

53.6 = 16.3 d

3.29 m = d

Only the part causes torque!

You need CW….so think if it should be 3.29 meters to left or right!

GOT IT! Show me

20.TA TB

205675

Put pivot pt on one of the

forces you don’t know(either one)

ROTATIONAL:

CW = CCW

205(1.5) + 675(2) = TB(3)

307.5 + 1350 = 3TB

553 N = TB

You could move pivot pt to other end to get TB

..or use TRANS like I did

TRANSLATIONAL:

UP = DOWN

TA + 553 = 205 + 675

TA = 327 N

GOT IT! Show me

21.

196

T30°

ROTATIONAL:

CW = CCW

196 L = sin30 T L

T = 392 N

TRANSLATIONAL:

Need: cos30(392) to right

339 N to right

GOT IT! Show me

22.

2000

T

1200

Tension is a right angle25

25

25

ROTATIONAL:

CW = CCW

sin25(2000)L + sin25(1200)(½ L) = T(¾ L)

845 + 254 = .75T

1465 N = T

TRANSLATIONAL:

619

1327

Break tension into Components to look at

forces UP, DOWN, LEFT, & RIGHT

Need: 1327 right 2581 up

2000 + 1200 - 619 1327

2581

2902 N @ 63

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