Search results
Find local businesses, view maps and get driving directions in Google Maps.
Doubling the mass of a moving object doubles the energy it has in its kinetic store. Doubling the speed of an object increases the energy it has in its kinetic store by four times. The energy an object has in its kinetic store of energy is found using the equation Ek = ½ mv².
7 sty 2013 · KE=1/2mv^2 and PE=mgh are two equations used in physics to calculate the kinetic energy and potential energy of an object. KE stands for kinetic energy, which is the energy an object possesses due to its motion. PE stands for potential energy, which is the energy an object possesses due to its position or state.
Sample Problem. What is the kinetic energy of a 45 kg object moving at 13 m/sec? 1. First we identify the information we are given in the problem: • mass = 45 kg. • velocity = 13 m/sec. 2. Next, we place this information into the kinetic energy formula: • KE = 1/2 mv2. • KE = 1/2 (45 kg)(13 m/sec)2. 3.
1 2 gt2 v(t)=!gt Now, let Õs calculate the total energy as a function of time. E=KE +PE = 1 2 mv(t)2+mgh(t) E= 1 2 (!gt)2+mg(D! 1 2 gt2)=mgD The result is actually independent of time and equal to the initial potential energy, demonstrating conservation of energy.
Potential Energy (PE) is stored energy due to position or state PE due to gravity = m g h. Kinetic Energy (KE) is energy of motion. KE = ½ m v 2
Mechanical Energy= Kinetic Energy + Potential Energy, or ME= KE +PE. If the object only has gravitational potential energy then the formula is ME= 1/2 mv2 + mgh, or ME= 1/2 x mass (kg) x velocity2 (m/s) + Mass (kg) x gravity (9.8 m/s) x height (m)
