This book reviews all the physics tested by the MCAT. It includes eight 30 minute exams in the MCAT format, and 120 additional stand alone questions.
FREE Two-Day Shipping for Students. Learn more |
Book Description
Editorial Reviews
Excerpt. © Reprinted by permission. All rights reserved.
Compare r and l in the diagram to the left.
Any problem on the MCAT involving torque, will be a statics problem. Therefore, use the following three formulas in the order given to solve any MCAT torque problem:
Fupward = Fdownward
Frightward = Fleftward
tclockwise = tcounter-cIockwise
Let’s assume that I’m given the length of the board ‘L’, the distance from the left end of the board to the hanging string ‘x’, the mass of the object ‘m’, and my mass ‘ms’. First, I have confidence that since they asked me, I know that there is a way to answer the problem using only basic science. Second, I draw the board labeling all the force vectors that act directly on it and no others. Third, I choose my system. Since I want the board to be in static equilibrium, I choose the board as my system. Fourth, I choose a formula. Since this is a torque problem (I want to prevent the board from rotating.), I know that I must use the three equations given on the previous page, and use them in the order given. Since there are no horizontal forces, I can throw out the equation with horizontal forces. The equation for the vertical forces leaves me with two unknown variables: d and T.
Now I go to my third equation. But I need to know the torques on my system. In order to find the torques, I must choose a point of rotation. I can choose any point that I want, but, since I need all the forces to act at 90 degrees to their lever arms, I will choose a point on the board. Let’s say that I use the left end of the board as my point of rotation. Now I draw my clockwise and counter-clockwise torques.
Any problem on the MCAT involving torque, will be a statics problem. Therefore, use the following three formulas in the order given to solve any MCAT torque problem:
Fupward = Fdownward
Frightward = Fleftward
tclockwise = tcounter-cIockwise
Let’s assume that I’m given the length of the board ‘L’, the distance from the left end of the board to the hanging string ‘x’, the mass of the object ‘m’, and my mass ‘ms’. First, I have confidence that since they asked me, I know that there is a way to answer the problem using only basic science. Second, I draw the board labeling all the force vectors that act directly on it and no others. Third, I choose my system. Since I want the board to be in static equilibrium, I choose the board as my system. Fourth, I choose a formula. Since this is a torque problem (I want to prevent the board from rotating.), I know that I must use the three equations given on the previous page, and use them in the order given. Since there are no horizontal forces, I can throw out the equation with horizontal forces. The equation for the vertical forces leaves me with two unknown variables: d and T.
Now I go to my third equation. But I need to know the torques on my system. In order to find the torques, I must choose a point of rotation. I can choose any point that I want, but, since I need all the forces to act at 90 degrees to their lever arms, I will choose a point on the board. Let’s say that I use the left end of the board as my point of rotation. Now I draw my clockwise and counter-clockwise torques.
Product Details
Would you like to update product info or give feedback on images?
|
Customer Reviews
|
There are no customer reviews yet.
|
|||
|
Video reviews
|
Tag this product(What's this?)Think of a tag as a keyword or label you consider is strongly related to this product.
Tags will help all customers organize and find favorite items. |
Sell a Digital Version of This Book in the Kindle Store
If you are a publisher or author and hold the digital rights to a book, you can sell a digital version of it in our Kindle Store.
Learn more
Customer Discussions
|
This product's forum
Active discussions in related forums
Search Customer Discussions
|
Related forums
|
Listmania!
So You'd Like to...
Look for Similar Items by Category
- Books > Education & Reference > Education > College Guides
- Books > Education & Reference > Education > Test Guides - Graduate & Professional > MCAT
- Books > Medical Books > Medicine > Test Preparation & Review
- Books > New & Used Textbooks > Medicine & Health Sciences > Test Preparation & Review
- Books > New & Used Textbooks > Test Prep & Study Guides
