Examples of Gravitational Potential Energy

When a tennis ball is dropped from 2 m, it possesses a certain amount of gravitational potential energy because of its mass and its height above the ground. As the ball falls, that energy is converted to kinetic energy.

Since the force required to lift it is equal to its weight, it follows that the gravitational potential energy is equal to its weight times the height to which it is lifted. PE = kg x 9.8 m/s2 x m = joules. PE = lbs x ft = ft lb.

• A raised weight.
• Water that is behind a dam.
• A car that is parked at the top of a hill.
• A yoyo before it is released.
• River water at the top of a waterfall.
• A book on a table before it falls.
• A child at the top of a slide.
• Ripe fruit before it falls.

In this example, a 3 kilogram mass, at a height of 5 meters, while acted on by Earth’s gravity would have 147.15 Joules of potential energy, PE = 3kg * 9.81 m/s2 * 5m = 147.15 J.

1 Answer. Equal to its weight. That is 3kg x 9.8 ms^-2 = (approx.) 30 N.

The change in gravitational potential energy, ΔPEg, is ΔPEg = mgh, with h being the increase in height and g the acceleration due to gravity.

Since the gravitational potential energy of an object is directly proportional to its height above the zero position, a doubling of the height will result in a doubling of the gravitational potential energy. A tripling of the height will result in a tripling of the gravitational potential energy.

The gravitational potential energy of an object is the ‘stored energy’ that the object has by being at that height. This is equivalent to its mass times the force of gravity, g (a defined constant of 9.8 m/s2) times the height of the object. Potential energy = mass x gravity x height.

When an object falls, its gravitational potential energy is changed to kinetic energy. You can use this relationship to calculate the speed of the object’s descent. Gravitational potential energy for a mass m at height h near the surface of the Earth is mgh more than the potential energy would be at height 0.

GPE

The kinetic energy formula defines the relationship between the mass of an object and its velocity. The kinetic energy equation is as follows: KE = 0.5 * m * v² , m – mass, v – velocity.

Total energy is the sum of all different types of energies a body can have. A body usually has 2 types, kinetic energy and potential energy. Total energy= K.E+P.E. For a spring mass system, if the spring has mass, total energy is K. E+PE+½kx² where k is the spring constant.

In classical mechanics, kinetic energy (KE) is equal to half of an object’s mass (1/2*m) multiplied by the velocity squared. For example, if a an object with a mass of 10 kg (m = 10 kg) is moving at a velocity of 5 meters per second (v = 5 m/s), the kinetic energy is equal to 125 Joules, or (1/2 * 10 kg) * 5 m/s2.

E = h * c / λ = h * f ,

1. E is the energy of a photon.
2. h is the Planck constant,
3. c is the speed of light,
4. λ is the wavelength of a photon,
5. f is the frequency of a photon.

Just as wavelength and frequency are related to light, they are also related to energy. The shorter the wavelengths and higher the frequency corresponds with greater energy. So the longer the wavelengths and lower the frequency results in lower energy.

To calculate frequency, divide the number of times the event occurs by the length of time. Example: Anna divides the number of website clicks (236) by the length of time (one hour, or 60 minutes).

How to convert eV to Hz? The formula to convert eV to Hz is 1 Electron-Volt = Hertz. eV is times Bigger than Hz. Enter the value of eV and hit Convert to get value in Hz.

1 electron volt (eV) = 0.00016 newton meters (N-m)

Convert the wavelength, measured in meters, to nanometers, by dividing this number by 1,/b>, 10 to the 9th power. The quotient is the wavelength of the given frequency (Hz) measured in nanometers (nm).

The threshold frequency of Cs is 9.42×1014 Hz.

: the minimum frequency of radiation that will produce a photoelectric effect.

Based on the classical description of light as a wave, they made the following predictions: The kinetic energy of emitted photoelectrons should increase with the light amplitude. The rate of electron emission, which is proportional to the measured electric current, should increase as the light frequency is increased.