Energy
Roller Coasters
Roller Coaster Calculations
Simple Machines
Simple Machine Calculations
100
This is the type of energy that is stored above ground?
Potential Energy
100
Where would the roller coaster have the greatest potential energy?
at point W
100
If the roller coaster has a mass of 300kg, what is the potential energy at point A?
73,500 J
100
Name the 6 types of simple machines.
Lever, wedge, wheel & axle, screw, pulley, incline plane
100
A 700 N barrel is rolled up a 8 m ramp to a platform 2 m above the ground. What force must be applied to the barrel?
175 N
200
What type of energy is energy in motion?
Kinetic Energy
200
Where would the roller coaster have the greatest kinetic energy?
Point X
200
What is the roller coasters total energy at point A?
73,500 J
200
Which simple machine works by creating space between two objects?
A wedge
200
To find mechanical advantage, you take ______________ divided by ____________.
Resistance force divided by effort force
300
What law states that energy can never be created or destroyed?
Conservation of Energy
300
Where is the total amount of energy the greatest?
All points are equal, so at all points
300
At point B, what time of energy is the roller coaster experiencing?
Potential and kinetic energy
300
How does and incline plane help to reduce the work done?
It distributes the force over a longer distance.
300
What does the efficiency of a machine mean?
How efficient it is at preserving the amount of work done.
400
Which has more potential energy: A 50lb box at 5 meters or a 50lb box at 10 meters?
50lb box at 10 meters
400
Potential energy in a roller coaster is transferred into what other types of energy?
Kinetic, heat, sound
400
What is the kinetic energy of the 300kg roller coaster at bottom of the first hill? 
64,680 J
400
What is it called when you have two or more simple machines working together?
A complex machine
400
If Alice did 1800 J of work to push a sofa up a ramp, but really 2500 J of work was needed to overcome friction. What is the efficiency of the ramp?
72% efficient
500
Energy is always measured in what?
Joules
500
What 2 forces have the greatest impact on roller coasters?
Gravity and Friction
500
What is the equation for centripetal force when looking at roller coasters?
Fc= mv2/r
500
For and ideal machine, ____________ is equal to _____________?
Work input is equal to work output
500
If a machine has an efficiency of 65% and you did 1200 J of work on the machine, what will be thh work output of the machine?
780 J