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THANK YOU…. To all who attended ‘It Gets Better,’ & To all who are participating in the Day of Silence. Your actions are making a positive difference for so many members of the Robbinsville community. . What is the weight of the unknown box? . 4.5 N 60 N 160 N 240 N 540 N 1800 N

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thank you to all who attended it gets better to all who are participating in the day of silence

THANK YOU….To all who attended ‘It Gets Better,’&To all who are participating in the Day of Silence

Your actions are making a positive difference for so many members of the Robbinsville community.

what is the weight of the unknown box
What is the weight of the unknown box?
  • 4.5 N
  • 60 N
  • 160 N
  • 240 N
  • 540 N
  • 1800 N
  • 4800 N
  • 10,800 N
  • None of the above
  • Not sure/not enough info
take out the hw from last night
Take out the HW from last night
  • We are going over #21, 33, 38
slide5
21a. Torque = Force x Lever Arm

Torque = 50N * 0.2 m

Torque = 10 N m

Part b)

STOP – before doing any math, should we expect a larger or smaller torque? (same force but now a larger lever arm)

Larger!

Torque = Force x Lever Arm

Torque = 50N * 0.5 m

Torque = 25 N m

slide6
Mass of the rock?

STOP – which must have the larger mass???

The rock!!! Smaller lever arm!

F * LA = Torque = F * LA

mass * 25 cm = 1kg * 50 cm

mass * 25 cm = 50 cm kg

Mass = 2 kg

Challenge – what is the WEIGHT of the rock?

Weight = mg

Weight = 2 kg * 9.8 m/s2

Weight is approximately 20 N

slide7
38)

200 g * 30 cm = 500 g * LA

6000 cm g = 500 g * LA

LA = 12 cm….

BUT WE ARE NOT DONE!

The question asks at what mark should it be placed?

If it’s suspended from 50 cm…

Then 50 cm + 12 cm =

The 62 cm mark!

post lab
POST LAB
  • Go to test seats
  • Open notes; NOT open text
  • EXTRA CREDIT – YOU MUST SHOW WORK next to each Mystery Box answer line in order to earn points
  • NO TALKING UNTIL TEACHER SAYS ITS OK – if you talk before you are given permission, you WILL LOSE POINTS.
  • When you are done, turn in post lab and take a copy of 11.5-11.7 notes
  • SILENTLY return to test seat and work on notes.
in which image a or b do you think the gymnast spin faster
In which image (a or b) do you think the gymnast SPIN FASTER?
  • A
  • B
  • Same in both
  • Not sure/not enough info
in which image a or b do you think the gymnast has the greatest rotational inertia
In which image (a or b) do you think the gymnast has the greatest ROTATIONAL INERTIA?
  • A
  • B
  • Same in both
  • Not sure/not enough info
in which image does the man have the greater rotational inertia
In which image does the man have the greater rotational inertia?

A B

  • A
  • B
  • Same in both
  • Not sure/not enough info
in which image does the man have the greater rotational velocity
In which image does the man have the greater rotational velocity?

A B

  • A
  • B
  • Same in both
  • Not sure/not enough info
in which image does the man have the greater angular momentum
In which image does the man have the greater angular momentum?

A B

  • A
  • B
  • Same in both
  • Not sure/not enough info
next class
NEXT CLASS
  • You will work on a short, hands on lab
  • You will have the remainder of class to work on your study guide
  • The study guide is due at the end of next class for +5
  • Your HW next class will be to prep for the Ch 10 & 11 test