,1. Multiple Choice: What is the principle behind the conservation
of mechanical energy in a closed system?
a) Energy cannot be created or destroyed, only transformed.
b) Energy is always conserved in the presence of non-conservative
forces.
c) Energy can be created in an isolated system.
d) Energy is not conserved in any system.
Correct Answer: a) Energy cannot be created or destroyed, only
transformed.
Rationale: The principle of conservation of mechanical energy
states that in an isolated system not subject to non-conservative
forces (like friction), the total mechanical energy remains constant.
2. Fill-in-the-Blank: The _______ of an object is directly
proportional to the net force acting on it and inversely proportional
to its mass.
Correct Answer: acceleration
Rationale: According to Newton's second law of motion, the
acceleration of an object is directly proportional to the net force
acting on it and inversely proportional to its mass (F=ma).
, Correct Answer: True
Rationale: This statement is true according to the law of
conservation of angular momentum, which states that if no external
torque acts on a system, its angular momentum remains constant.
4. Multiple Response: Which of the following are scalar quantities?
(Select all that apply)
a) Velocity
b) Speed
c) Force
d) Temperature
e) Energy
Correct Answers: b) Speed, d) Temperature, e) Energy
Rationale: Scalar quantities have magnitude only and do not have
direction, which applies to speed, temperature, and energy.
Velocity and force are vector quantities, which have both
magnitude and direction.
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 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 EmilioOchieng. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £11.80. You're not tied to anything after your purchase.
