The ramp phet simulation physics 2010

Name:________________________

The Ramp (and Friction) PhET Simulation Lab

Introduction:

When an object is dragged across a horizontal surface, the force of friction that must be overcome depends on the normal force as  and the normal force is given by .  When the surface becomes an inclined plane, the normal force changes and when the normal force changes, so does the friction.  In this lab, you will change the angle of an inclined plane and observe how weight is resolved into its components (Fn and F//) using the basic trig functions.

 

Procedure:  Play with the Sims à Motion à The Ramp

·         Be sure to stay in the part of the simulation.  More features will be used later when we investigate energy.  Start by playing with the cabinet some.  Have fun, really…    Now…back to work.

·         Text Box: Horizontal planeMove the cabinet up and down the ramp by dragging it with your mouse.

·         Move the ramp to an angle of zero (horizontal) and draw a free body diagram of the cabinet here:

1.      On a horizontal plane, the normal force is ________ to the weight.

2.      Text Box: Inclined planeThe cabinet has a mass of 100kg.  It therefore has a normal force of _________ N and a friction force (on the horizontal plane) of __________ μ = 0.30

·          the ramp and draw a free body diagram of the cabinet in the box here:

3.      The force down the plane and normal force are components of ____________.

4.      Before we add an applied force on the ramp, there is a force of ____________ that acts against the force down the plane( Force parallel).

5.      When we apply a force to get the cabinet moving, the friction force acts in the ____________ direction as movement of the cabinet.

6.      Slowly increase angle (0.1 degrees at a time) of the ramp until the cabinet starts to move on its own.  What angle is this? ____________ = θ

7.      At this point, the force down the plane is ____________ than the force of friction.

8.      Since the ramp is now at an angle, the normal force is _________ than the weight.

9.      At the angle above, the normal force equals ___________N. (hint: what trig function?)

10.  At the angle above, the force down the plane equals ____________N. (trig function?)

11.  Using the formula for friction above, the force of friction is ________________N.

12. 

If the plane-cabinet were frictionless, what angle would be required for the cabinet to move?  _______

13.  Why? __________________________________________________________________

 

Calculate first, then test each object in the table below with the simulation on a horizontal plane.

 

Object             Mass          Weight      Normal Force     μ, Coef of Friction       Friction Force to Overcome

Dog

 

 

 

0.10

 

Crate

 

 

 

0.70

 

Piano

 

 

 

0.40

 

Refrigerator

 

 

 

0.50

 

Conclusion Calculations:                                          GRADED   ( ½ point each )

Back to the cabinet ().  μ = 0.30                                         

Complete the table below.  You may check your answers in the simulation.

Force Applied is the force required (by you for instance) to make the cabinet move at a constant velocity in either direction or keep it from accelerating (if applicable).

 

Recall…constant velocity = _______ net force.

Also note: force applied may change direction as the angle increases!

 

Angle, θ      Mass          Weightg = 9.8m/s2    Normal Force, Fn     Force parallel F//    Friction Force Ff    Force Applied, Fa

0.00o

100. kg

 

 

0.00 N

 

1.

10.0o

100. kg

 

 

 

2.

 

20.0o

100. kg

 

 

3.

 

 

30.0o

100. kg

 

4.

 

 

 

40.0o

100. kg

 

 

5.

 

 

50.0o

100. kg

 

 

 

6.

 

60.0o

100. kg

 

 

 

 

7.

70.0o

100. kg

 

 

 

8.

 

80.0o

100. kg

 

 

9.

 

 

90.0o

100. kg

 

0.00 N

 

10.

 

Conclusion Questions:

 

  1. On a horizontal plane, the _____________force equals the _____________.
  2. As the angle of the ramp is increased, the normal force increases / decreases / remains the same and the friction force increases / decreases / remains the same.
  3. As the angle of the ramp is increased, the force parallel increases / decreases / remains the same.
  4. The angle at which the force down the plane was equal to the force of friction (for the cabinet) was _____________.
  5. Consider a very low (zero) friction, 5.0 kg skateboard on a ramp at an angle of 15o to the horizontal.  What would be the net force that would cause acceleration when the skateboard is allowed to move? _____________ N
  6. What would be the skateboard’s acceleration down the plane? _____________ m/s2
  7. Now consider the same no-friction 5.0 kg skateboard on the same 15o ramp.  If a 45kg teenager jumps on, what would be her acceleration down the ramp? _____________ m/s2
  8. Imagine you are pushing a 15 kg cart full of 25 kg of bottled water up a 10o ramp.
  9. If the coefficient of friction is 0.02, what is the friction force you must overcome to push the cart up the ramp? _____________ N
  10. Realizing that there is also a force parallel (as a component of weight) you must ALSO overcome, what is the TOTAL force you must apply to push the cart up the ramp at a constant speed? _____________ N
Place your order
(550 words)

Approximate price: $22

Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
$26
The price is based on these factors:
Academic level
Number of pages
Urgency
Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

Read more

Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

Read more

Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.

Read more

Privacy policy

Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.

Read more

Fair-cooperation guarantee

By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.

Read more