Paper 2 Revision Flashcards
Why is GPE a negative value?
We assume that the GPE at infinity is zero
What does a positive total energy indicate
KE is greater than GPE
Why would the total energy of an object be negative?
An object requires energy to move away from a body. The GPE is zero at infinity
The object is in a bound system in orbit due to the body’s gravitational attraction, so the magnitude of the EK is less than the GPE
true or false? Gravitational potential is a vector
false
Why is there are increase in energy stored by a capacitor when a polythene sheet is pulled out from between the plates?
Work must be done to remove the dielectric against the attractive forces between the parallel plates and the edges of the sheet due to the alignment of polar molecules
How does potential energy change when objects are moving further away?
Potential energy increases
During a change of phase what changes? what does not change
potential energy, temperature does not change
