Kinetic and potential energies Flashcards
1
Q
What is energy?
A
The ability a body has to work.
2
Q
What are the two main types of energy?
A
Kinetic energy (Ek) and potential energy (Ep).
3
Q
What is dependent on the kinetic energy? (2)
A
1) Mass
2) Velocity
4
Q
What is the equation for kinetic energy?
A
1/2mv^2
5
Q
Show how Ek=1/2mv^2?
A
1) W=fs and F=ma
2) W=mas
3) where u=o, v^2=u^2+2as
4) v^2=2as
5) v^2/2=as then put as into (2)
6) Ek=mv^2/2 therefore 1/2mv^2
6
Q
What is the kinetic energy of an object equal to at a speed?
A
The work done on the object from rest.
7
Q
What are the 3 main forms of potential energy?
A
1) Gravitational
2) Electric
3) Elastic
8
Q
In Ep the greater the height the greater the…….?
A
Potential energy
