Mechanical Energy
What is the scientific study of motion?
Mechanics, or the study of Mechanical Energy (p.14)
Energy is either being ______, or it is being ______
Used, or stored (p.16)
What is the law of conservation of energy?
Energy cannot be created or destroyed, it can only change forms (p.19)
Define momentum?
Movement in a particular direction.
Objects that are moving are said to have momentum (p.22)
Define Force
A push or a pull
Define mechanical energy
One of the most visible forms of energy, the energy of movement and ability to perform work (p.14-15)
Kinetic Energy (p.16)
What is the First Law of Thermodynamics?
In a closed system, energy can neither be created nor destroyed, only transformed or transferred (p.20)
Define velocity?
Speed in a particular direction (p.22)
The force used to hold up a suspension bridge is called ________.
Tension
What is energy?
The ability to perform work (p.15)
Energy that is being stored is said to be what kind of energy?
Potential Energy (p.16)
What law describes this statement:
Matter cannot be created or destroyed, it can only change forms.
Law of Conservation of Mass (p.20)
Mass and velocity (or speed) (p.22)
Why do boats float?
Buoyancy: Boats displace enough water to cause enough force to keep it from sinking.
What is it called when we use a machine to increase our ability to do work?
Mechanical Advantage (p.15)
Give an example of an object with kinetic energy.
A ball rolling down a hill, a pendulum while it is swinging, etc.
What is the final form of most energy?
Heat!
Describe the Law of Conservation of Momentum
Changes of momentum in a closed system must be equal. (p.22)
Define Net Force
The sum of all forces acting on an object. This will determine the direction that an object will move.
What are 3 ways that objects move? (Hint: Remember our demonstration on the first day of science)
Straight lines, arcs, circular (p.14)
Give an example of an object with potential energy
How are energy and matter related?
All mass has energy, and all energy has mass.
E = MC2
If a fast, heavy object hits a still, light object, what happens?
The object with more mass and speed has more momentum, so it will transfer momentum to the object at rest and cause it to move.
If a boat is traveling west at 15 m/s, but the current is moving east at 10 m/s, which direction is the boat going and what is its velocity?
The boat is going west at 5 m/s.
15 m/s west - 10 m/s east = 5 m/s west