Simple Machines
Give me a good definition of work and how you clculate it.
Work is when a force produces motion in teh same direction as teh force. The calculation would be W=F times D
What is a second class lever taht we know of and why is it a second class lever?
A wheelbarrow is a really god example because the load is in the middle and then the fulcrum is on the opposite side of the effort.
How do you calculate Kinetic energy?
KE=1/2mv2
Remmber to always do the exponent first
True or False
When someone is bicycling up a hill is that potential energy?
True
Were do we see gravtatioal energy? GIve a real life examples.
When you play a sport such as volleyball when you serve the ball it goes down towards the end were most of the kinetic energy is stored.
Describe for me an inclined plane and how it helps make work easier. Give me an example.
A sloping surface that makes it easier to move objects to a higher and lower place. Inclined planes make worke asier by increasing distance and decreasing force. Ex- Ramp
Describe for me the first class lever and two examples.
The first class lever is were the fulcrum is in the middle and the load and effort on opposite side. Examples-scissors, handgrippers, etc.
What is kinetic energy?
It is the energy of a moving object. Anyhting that is moving has kinetic energy.
How do you claculate potential energy?
PE=m times g(9.8) times h
Closer to the bottom.
How does a pulley make work easier?
BY changing the direction of the force and increasing the applied force.
What is a lever and how does it make work easier?
A lever is an object or bar that pivots at a certain point whihc we call a fulcrum. We have the 1st ,2nd , and 3rd class lever. Levers make work easier by loftng weight with less effort, so it increases teh distance and decreases the effort.
What are 2 example in your house that shows kinetic energy?
Fan, glass dropping and breaking on the floor, etc.
Whe does a roller coaster have the most potential energy?
At the top of the hill.
Name for me all of the types of kenetic energy
What is it called when a simple machine causes something to increase ... but decrease ...
Inverse Proportion
What all does a lever consist of?
A beam, stick, rod/fulcrum.
What does kinetic energy depend most on?
Mass and velocity
What are 4 examples in your home that describe PE?
A book on a shelf, battery, lightbulb, tv, etc.
Name all the potential energys
Mechanical, electrical, chemical, radiant, nuclear, and thermal.
An inclined plane wrapped around a cylinder is a screw and a good example is the bottle cap of really anyhting including a medicines screwed on top.
A broom, baseball bat, hammer, a fishing rod, and tweezers.
A truck is tarveling at a velocity of 20 m/s and has a mass of 2223 kg. What is the kinetic energy?
KE=0.5 times m times v2
KE=0.5 times 20 times 22232
KE=0.5 times 20 times 4941729
49417290 Joules
The roller coaster is sitting at the top of a hill that is 20 m high and the mass is 2.6, what is the potential energy?
PE=20 times 9.8 times 2.6
509.6 joules
Descibe for me elastic, chemical, and nuclear energy.
Elastic- energy stored in objects that stretch.
Nuclear energy- energy stored in teh center of particals.
Gravitational Energy- energy stored in an object due to its height.