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Questions and Answers
What is the formula for kinetic energy?
What is the formula for kinetic energy?
- $W_k = mgh$
- $W_k = \frac{1}{2} mv$
- $W_k = \frac{1}{2} mv^2$ (correct)
- $W_k = mv$
Which of the following is NOT a unit of power?
Which of the following is NOT a unit of power?
- Watt (W)
- Joule (J) (correct)
- Horsepower (hp)
- Kilowatt (kW)
What is the definition of power?
What is the definition of power?
- The force applied over a distance
- The total amount of work done
- The rate of doing work (correct)
- The energy consumed per unit time
In light refraction, which angles define the process?
In light refraction, which angles define the process?
When will total reflection NOT happen?
When will total reflection NOT happen?
Flashcards
Kinetic Energy
Kinetic Energy
The energy possessed by a moving object. It depends on the object's mass and velocity. Formula: KE = 1/2 * mv^2
Work
Work
The amount of energy transferred when a force makes an object move a certain distance. Formula: Work = Force x Distance
Power
Power
The rate at which work is done. Formula: Power = Work / Time
Refraction
Refraction
The bending of light as it passes from one medium to another. It happens because light travels at different speeds in different mediums.
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Rainbow
Rainbow
A phenomenon caused by the refraction and reflection of sunlight through water droplets in the atmosphere. Different colors of light are refracted at different angles, creating the visible arc.
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Physics Study Notes
- Kinetic Energy: Calculated by the formula KE = 1/2mv². Depends on mass and velocity.
- Work: Measured in Joules (J), calculated as force multiplied by distance moved in the force's direction (W = Fd).
- Power: The rate at which work is done, measured in Watts (W). Power = Work/Time.
- Units of Power: Joules per second (or Watts) are the standard units.
- Types of Energy: Kinetic, potential, and other energy forms exist.
- Light Refraction: Light changes direction when passing through different mediums. The angle of refraction is dependent on the angle of incidence and the properties of the mediums.
- Light Dispersion: White light separates into various colors when passed through a prism.
- Total Internal Reflection: Occurs when light travels from a denser medium to a less dense one and the angle of incidence exceeds a critical angle.
- Angle of Incidence/Refraction: Angles related to the way light rays interact with surfaces.
- Optical Phenomena These involve the bending, reflection, or absorption of light in various ways.
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