Systems
Kinetic & Potential Energy
Work
Conservation of Energy
Power
100
A very common system is the Object and ______ System
Object and Earth System
100
If an object's velocity is tripled, its Kinetic Energy increases by this factor.
100
Other than the equation W = F * D, this is the definition of Work
Change in Energy
100
In the absence of friction and air resistance, this sum remains constant throughout an object's motion.
Potential Energy + Kinetic Energy (Total Mechanical Energy)
100
This is the standard SI unit for Power, defined as one Joule per second.
Watts
200
A closed system never ________
Loses or Gains Energy
200
Calculate the elastic potential energy stored in a spring with a constant k = 200 N/m that is compressed 0.1m
Joule
200
This is the amount of work done by a waiter carrying a 5kg tray at a constant velocity across a 10m room.
None
200
A 1 kg ball is thrown upward with 50 J of kinetic energy. Calculate its maximum height (use g = 10 m/s^2).
Meters
200
An engine does 12,000 J of work in one minute. Calculate its power output in Watts.
200 Watts
300
A block slides down a rough incline in a vacuum. If the system is defined as "The Block and the Earth," name the force that is considered "external" to this system.
Friction
300
On a graph of Gravitational Potential Energy (Ug) vs. Height (h), this specific physical constant represents the slope of the line (assuming mass is constant).
Weight (Mass * Acceleration due to Gravity)
300
On a Force vs. Position graph, this geometric feature represents the work done on the object.
Area under the Curve
300
Transfer of your hand's Kinetic Energy to ____ as ____
To the Rocks (environment/outside the system)
300
A motor lifts a mass at a constant speed, this is the relationship between the power required and the velocity of the lift.
Power = Force (Weight) * Velocity
400
If he deploys a Parachute, in the Man, parachute, and Earth System the system does _____ work on the _____.
The System does positive Work on the Surroundings
400
The angle on the swing where PE and KE are equal
Less than halfway from the Horizontal (70ish degrees)
400
The two conditions that must be met for a force to be considered "doing work" on an object.
Force must be Applied, and Force must be in the same direction
400
Where energy goes in a bowling ball and earth system, when getting a strike
Some of the energy goes into the Pins and some continues as KE for the Bowling ball.
400
The amount of horse power an average horse has
(2/3)*746 = 497
500
When the Earth is NOT included in the object's system, this is what replaces Potential Energy
External Work
500
An object is dropped from rest. This is the type of relationship between its Kinetic Energy and the square of the time it has been falling.
Direct Relationship
500
A force of 50N is applied at a 60 degree angle to a box moving 4 m horizontally. Calculate the work done by this force.
Joules
500
Ratio of work between a Force being applied to a block at an angle of 60 degrees across a surface, vs horizontally across a surface
1 : Square Root (3)
500
A 50kg car experiences a constant deceleration of -10m/s^2 while traveling at a constant 30 m/s. Calculate the power the engine must provide just to maintain this speed.
15,000 Watts
