what is kinetic energy ???
Answers
Explanation:
energy which a body possesses by virtue of being in motion.
"energy above that needed to ionize the molecule is carried away as kinetic energy of the electron ejected
Answer:
Kinetic Energy Definition
In physics, kinetic energy is the energy an object has due to its motion. It is defined as the work required to accelerate a body of a given mass from rest to a certain velocity. Once the mass reaches the velocity, its kinetic energy remains unchanged unless its speed changes. However, velocity and thus kinetic energy depend on the frame of reference. In other words, an object’s kinetic energy is not invariant.
Kinetic Energy Units
The SI unit of kinetic energy is the joule (J), which is a kg⋅m2⋅s−2. The English unit of kinetic energy is the foot-pound (ft⋅lb). Kinetic energy is a scalar quantity. It has magnitude, but no direction.
Kinetic Energy Examples
Anything you can think of that has mass (or apparent mass) and motion is an example of kinetic energy. Kinetic energy examples include:
A flying aircraft, bird, or superhero
Walking, jogging, bicycling, swimming, dancing, or running
Falling down or dropping an object
Throwing a ball
Driving a car
Playing with a yo-yo
Launching a rocket
A windmill spinning
Clouds moving across the sky
The wind
An avalanche
A waterfall or flowing stream
Electricity flowing through a wire
Orbiting satellites
A meteor falling to Earth
Sound moving from a speaker to your ears
Electrons orbiting the atomic nucleus
Light traveling from the Sun to the Earth (photons have momentum, so they have apparent mass)
Kinetic Energy Formula
The formula for kinetic energy (KE) relates energy to mass (m) and velocity (v).
KE = 1/2 mv2
Because mass is always a positive value and the square of any value is a positive number, kinetic energy is always positive. Also, this means the maximum kinetic energy occurs when velocity is greatest, regardless of the direction of motion.
From the kinetic energy equation, you can see an object’s velocity matters more than its mass. So, even a small object has a lot of kinetic energy if it’s moving quickly.
The kinetic energy formula works in classical physics, but it starts to deviate from true energy when the velocity approaches the speed of light (c).
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