Class notes
Unit 2 - Energy
- Course
- SPH4U (SPH4U)
- Institution
- White Oaks Secondary School
In class notes from the second unit of grade 12 physics, energy.
[Show more]
Content preview
Unit 2 - Physics Notes, (1) Notes - Work
Monday, March 25, 2019 9:51 PM
- Work is done by a constant force
- Work (W) - the energy transferred to or from an object by means of a force acting on
the object
- Positive Work - the work done when the displacement and the applied force act in
the same direction
- Negative Work - the work done when the displacement and the applied force act in
opposite directions
- Joule (J) - SI derived unit for measuring forms of work and energy; equal to the work
done when a force of 1 N displaces an object 1 m in the direction of the force
- W = F(d)
- W = (F)(d)(cos theta) where theta is the angle between the directions of the force
and the displacement
- Work = area under a force vs change in distance graph
- Zero displacement = zero work
- 1 J = 1 Nm
- Example: How much work is done by you pulling a wagon with a horizontal force of
50 N for a distance of 6.4m?
○ Therefore, the work is 320 J.
- Example: A student is pulling a wagon at a constant velocity with a force of 60 N. The
handle of the wagon is at 33 degrees above the horizontal. How much work is done
by the student if she must move the wagon 0.25 km?
○ Therefore, there is 1.3 x 10^4 J of work being done.
- Example: You toboggan to a stop 20.1 m along the horizontal at the bottom of the
hill. The total mass of you and the toboggan is 73.2 kg, and the coefficient of kinetic
friction between the toboggan and the snow is 0.106.
○ Draw a free body diagram of the situation and determine the magnitude of
kinetic friction.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller studyingwithcass. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$4.19. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
70840 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now