Energy Changes in a system

Question 1

What is the definition of energy?

Answer 1

The ability of an object to do work.

Question 2

What is the deffiniton of work?

Answer 2

That when work is done by an object energy is transferred from the object.
Work done = energy transferred

Question 3

What is the unit for work done and energy?

Answer 3

Joules (J)

Question 4

What does the principle of conservation of energy mean?

Answer 4

That the total amount of energy in a closed system is constant.

Question 5

What is the equation for Gravitational potential energy?

Answer 5

GPE= mass (kg) x gravitational field strength (N)kg) x height (m)

Question 6

What is the equation for kinetic energy?

Answer 6

Ke = 1/2 x mass (kg) x speed (m/s) 2

Question 7

What is the equation for elastic potential energy?

Answer 7

EPE= 1/2 x spring constant x extension 2

Question 8

What is the definition of specific heat capacity?

Answer 8

the amount of energy it take to increase the temperature of 1kg of a material by 1 degree

Question 9

What is the unit for specific heat capacity?

Answer 9

J/Kg c (degrees)

Question 10

What is the equation for specific heat capacity?

Answer 10

chance in thermal energy= mass x SHC x change in temperature