Machines
Portfolio for Physical Science 2007
This
is a review for the machines test on Wednesday. Review machines packet and review the book pages (honors)Holt
284-284-296 and CPO pages 65-77.
Answer
the following Questions in a Powerpoint presentation. You must have a minimum of 15 slides. When you print out you presentation make sure you print 6
slides per page-(handout format).
- Give
a definition and show a graphic of all the simple machines.
- Define
Simple Machine and tell what they are most commonly used for in life.
- Show
each type of lever and explain where the fulcrum, resistance and effort are
located in each.
- Show
a graphic and fully explain the differences in a fixed and moveable pulley.
- Why
do screws have different types and distances between the threads?
- What
is mechanical advantage and why is it important in a machine? List the mechanical advantage formula and give a problem
for 3 different simple machines.
- A
refrigerator weighs 2200N.
It is pushed up a 10 meter ramp with a force of 800N.
What is the Mechanical Advantage of the ramp?
- A.
A worker applies a force of 50N to pry open a window that has
resistance of 800N. What is the Mechanical Advantage?
B What is the Force output of a simple machine that
has a MA of 8 and has a Force input of 14?
- Knowing
that IMA of an inclined plane is length / height
, what is the MA of a
machine that has a
length of 120 meters and a height of 100 meters?
- How
much power is used if a force of 35 Newtons is used to push a box a distance
of 10 meters in 10 seconds? Show
work on the slide.
- Explain
what a Rube Goldberg device is and explain how you would develop one in your
own house or room.
- IF
the work put in to a machine is 1600J
and the workout of a machine is 1475J
what is the overall efficiency of the machine?
Show all work!
- Explain
and show a graphic how the mechanical advantage can vary in 2 different pulley systems.
- Find
an educational website and list 3 questions regarding the website.
(This must be an age appropriate site.)
Make sure list the website and the question you write about the site.
- What is the Power of an object that has a mass of 12 kg and is
moved 14m in a total of 43 seconds?
A machine that uses 210watts of power moves an object a
distance of 15 meters in 37
seconds. Find the force needed and
the work done by this machine.
A 2700N box is moved up a ramp that is 8m long with a force
of 2450 N to a height of 6 meters. What are the following:
Resistance Force
Resistance distance
Effort Force
Effort distance
Mechanical Advantage
Ideal Mechanical Advantage
Efficiency
- Complete
the calculations for the following lever.
