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

1 / 14

# Your actions are making a positive difference for so many members of the Robbinsville community. - PowerPoint PPT Presentation

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

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about 'Your actions are making a positive difference for so many members of the Robbinsville community.' - terena

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

### 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
• 4800 N
• 10,800 N
• None of the above
• Not sure/not enough info
Take out the HW from last night
• We are going over #21, 33, 38
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

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

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
• 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
• 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?
• A
• B
• Same in both
• Not sure/not enough info

A B

• A
• B
• Same in both
• Not sure/not enough info

A B

• A
• B
• Same in both
• Not sure/not enough info

A B

• A
• B
• Same in both
• Not sure/not enough info
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