The wheel of a car has a diameter of 16 inches and moves a smaller
wheel of 4 inches. What is the mechanical advantage gained by the
system?
a.)1:4
b.)4:1
c.)1:2
d.)2:1 - ANSWER-b.)4:1
A lever
a.)Reduces resistance
b.)Multiplies force and changes direction
c.)Transmits power from one object to another
d.)Cannot move in the reverse direction - ANSWER-b.)Multiplies force
and changes direction
Tension can best be called a.)A
weight
b.)A force
c.)A movement
d.)A direction - ANSWER-b.)A force
Which of the following wedges generates the greatest amount of
force.
,a.)11" long and 4" high
b.)9" long and 4" high
c.)7" long and 4" high
d.)5" long and 4" high - ANSWER-a.)11" long and 4" high
You're trying to replace a flat. How much torque are you applying to a
wheel nut if you're applying 40 pounds with a wrench measuring 9"?
a.)4 ft-lb
b.)30 ft-lb
c.)53 ft-lb
d.)360 ft-lb - ANSWER-*Torque is calculated by multiplying force (in
pounds) and length (in feet). Thus, 40 pounds multiplied by .75 feet
gives us 30 ft-lb of torque.
1 ft=12 in
Divide 9 in by 12 ft=.75ft b.)30
ft-lb
Which of the following situations requires overcoming the least
amount of kinetic friction?
a.)Pushing an empty refrigerator box down a path
b.)Pushing a refrigerator in its box down a path
c.)Pushing an empty refrigerator box down an icy path
d.)Pushing a refrigerator in its box down an icy path - ANSWER-
c.)Pushing an empty refrigerator box down an icy path
What measures how much force is applied to an object in order to
rotate it?
Which of the following is NOT a unit of power? a.)Watt
b.)Horsepower
c.)Volt-ampere
d.)Newton - ANSWER-d.)Newton
What is the potential energy of a 4 lb. book held 50 feet in the air?
a.)1,960 J
b.)268 J
c.)200 J
d.)27 J - ANSWER-*Potential energy is calculated by multiplying mass
(in kilograms), acceleration due to gravity, and height (in meters).
Thus, the potential energy of the book is 268.128 J: 1.8 kilograms
multiplied by 15.2 meters multiplied by 9.8 m/s2.
b.)268 J
When a machine compounds the force you use, it gives you a(n)
a.)Mechanical advantage
b.)Output advantage
c.)Mechanical leverage
d.)Output leverage - ANSWER-a.)Mechanical advantage
, Which of the following is an example of potential energy?
a.)Rain falling
b.)A bowling ball rolling
c.)A slinky at the top of stairs
d.)A person walking down a hill - ANSWER-c.)A slinky at the top of
stairs
*Potential energy is energy that can be converted to movement, like a
diver ABOUT to jump. Potential energy is dependent on an object's
position. For example, a diver at the top of a tall cliff has considerable
potential energy. Potential energy is measured in joules (J).
A 180 pound person dives off of a 30 foot cliff. What is their velocity
as they enter the water? a.)588 m/s
b.)178 m/s
c.)24 m/s
d.)13 m/s - ANSWER-d.)13 m/s
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 nyagajoseph539. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $22.99. You're not tied to anything after your purchase.
