This is a general equation that applies when you have kinetic energy, gravitational PE, elastic PE, and external work. Depending on the particular problem, one or more terms may be zero.Tastosis said:K1 + Uel1 + Ugrav1 + Wothers = K2 + Uel2 + Ugrav2
½MV1^2 + ½KX^2 + mgy1 + Wothers = ½MV2^2 + ½KX2^2 + mgy2
Rather than think in terms of things 'cancelling', compare the initial and final positions and their associated energy terms.Tastosis said:Based on the equation, what should and shouldn't be cancelled? And why??
When you say 'cancel', what you mean is 'ignore because it equals zero'. (OK.) As far as U2g is concerned, whether it equals zero or not depends on where you measure it from. Hint: If you measure gravitational PE from the lowest point of the block's motion, then you can set U2g = 0. (But then what does U1g equal?)Tastosis said:Sorry it took me long to get back to you guys...
[PLAIN]http://img407.imageshack.us/img407/6095/73837542.jpg
Do I cancel U2g? =3
Potential energy is the energy that an object possesses due to its position or state. It is the stored energy that can be converted into other forms of energy, such as kinetic energy.
Potential energy can be calculated by multiplying the mass of the object by the acceleration due to gravity and the height of the object above a reference point. The formula for potential energy is PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.
Potential energy is a form of energy that can be converted into other forms, such as kinetic energy. According to the law of conservation of energy, energy cannot be created or destroyed, only transferred or transformed. This means that the total amount of energy in a closed system remains constant, and potential energy can be converted into other forms of energy without any loss.
Yes, potential energy can be negative. This occurs when the object is below the reference point or at a lower potential energy level. For example, if an object is placed at a depth below ground level, its potential energy would be negative.
Potential energy can be converted into kinetic energy when an object is allowed to move from a higher potential energy level to a lower one. This can be achieved through various means such as dropping an object from a height, releasing a compressed spring, or converting chemical potential energy into kinetic energy through combustion.