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There are two forms of energy: potential energy and kinetic energy. Potential energy is the energy that an object has due to its relative position with another object. [1] X Research Source For example, if you are standing on top of a hill, you have more potential energy than standing at the bottom of a hill. Kinetic energy is the energy an object has when it is in motion. [2] X Research Source Kinetic energy can be generated by vibration, rotation or displacement (movement from one place to another). [3] X Research Source We can easily calculate the kinetic energy of any object using the equation in terms of its mass and velocity. [4] X Research Sources
Steps
Understanding kinetic energy
- The answer is always written in joules (J), which is the standard unit of measurement for kinetic energy. It is equivalent to 1 kg * m 2 /s 2 .
- Adjust the weight. Before weighing the object, you must set the scale to 0. [6] X Research Source
- Place the object on the scale. Gently place the object on the scale and record the mass in kilograms.
- If necessary, convert from grams to kilograms. To perform the final calculation, the mass must be expressed in kilograms.
- Velocity is defined as distance traveled divided by time: V = d/t . Velocity is a vector quantity, meaning it has magnitude and direction of motion. Magnitude is a numerical value to quantify speed, while direction of motion is the direction in which speed occurs during motion.
- For example, the speed of an object can be 80m/s or -80m/s, depending on the direction of motion.
- To calculate velocity, you divide the distance the object travels by the time it takes for it to cover that distance.
Dynamic feature
- The answer is always written in joules (J), which is the standard unit of measurement for kinetic energy. It is equivalent to 1 kg * m 2 /s 2 .
- KE = 0.5 x mv 2
- KE = 0.5 x 55 x (3.87) 2
- KE = 0.5 x 55 x (3.87) 2
- KE = 0.5 x 55 x 14.97
- KE = 411,675 J
Use kinetic energy to find velocity or mass
- The answer is always written in joules (J), which is the standard unit of measurement for kinetic energy. It is equivalent to 1 kg * m 2 /s 2 .
- Example 1: An object has a mass of 30 kg and a kinetic energy of 500 J, what is its velocity?
- KE = 0.5 x mv 2
- 500 J = 0.5 x 30 xv 2
- Example 2: An object has a kinetic energy of 100J and a velocity of 5m/s, what is its mass?
- KE = 0.5 x mv 2
- 100 J = 0.5 xmx 5 2
- Example 1: An object has a mass of 30 kg and a kinetic energy of 500 J, what is its velocity?
- KE = 0.5 x mv 2
- 500 J = 0.5 x 30 xv 2
- Multiply the mass by 0.5: 0.5 x 30 = 15
- Divide the kinetic energy by the result you just found: 500/15 = 33.33
- Take the square root to find the velocity: 5.77 m/s
- Example 2: An object has a kinetic energy of 100J and a velocity of 5m/s, what is its mass?
- KE = 0.5 x mv 2
- 100 J = 0.5 xmx 5 2
- Square the velocity: 5 2 = 25
- Multiply by 0.5: 0.5 x 25 = 12.5
- Divide the kinetic energy by the result you just found: 100/12.5 = 8 kg
This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This entry has been viewed 58,076 times.
There are two forms of energy: potential energy and kinetic energy. Potential energy is the energy that an object has due to its relative position with another object. [1] X Research Source For example, if you are standing on top of a hill, you have more potential energy than standing at the bottom of a hill. Kinetic energy is the energy an object has when it is in motion. [2] X Research Source Kinetic energy can be generated by vibration, rotation or displacement (movement from one place to another). [3] X Research Source We can easily calculate the kinetic energy of any object using the equation in terms of its mass and velocity. [4] X Research Sources
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