Energy Types
Energy in motion
What is kinetic energy?
Q stands for:
What is Heat Energy?
A man climbs on to a wall that is 3.6m high and gains 2268J of potential energy. State the mass of the man
What is 64.3 KG?
Solution:
PE =MGH
2268 = m (9.8)(3.6)
m= 64.3 KG
Falling rocks from the top of a mountain
What is kinetic/GPE energy?
What is 9.8 m/s2?
Energy stored in an object because of its height
What is Gravitational Potential Energy?
These are the three ways we can experience thermal energy transfer:
What is conduction, convection, and radiation?
What is 12,600 G in KG?
What is 12.6 KG?
Food before it is eaten
What is chemical energy?
State the following energy type: energy stored in an object
What is potential energy?
Energy stored in the nucleus of an atom. It is released when the nucleus splits or combines
What is nuclear energy?
A bowl of soup was placed in a microwave. The soup was initially at room temperature (20 C) but afterwards was at a temperature of (80 C).
Calculate △T:
What is 60 C?
Solution:
△T = Final – initial = (80-20) = 60 C
A flea has a mass of 200.0 mg and can jump approximately 20cm straight up. State the gravitational potential energy at the highest point that the flea jumps
What is 0.392 J
Solution:
PE = MGH
PE = (0.2000) (9.8) (0.20)
PE = 0.392 J
The rumble of thunder from a storm
What is sound energy?
State the following law:
Energy can neither be created nor destroyed.
Energy can be transformed from one form of energy to another, and transferred from one object to another
What is the Law of Conservation of Energy?
Energy stored in the bonds of atoms and molecules
What is chemical energy?
The specific heat of gold is 130J/kg·K.
State the quantity of heat energy required to raise the temperature of 100g of gold by 50 C
What is 4,199 J
Solution:
Q = mc△T
Q= 130 J/kg*K x 0.1 kg x 323K = 4,199 J
A 1600kg car travels at a speed of 12.0m/s. Find its kinetic energy.
What is 115,200 J?
KE = 1/2 x 1600kg x 122
KE = 115,200 J
The energy that runs a refrigerator
What is electrical?
State the following concept: Energy is lost to the surroundings
What is friction?
Energy from the vibration of atoms and molecules
What is Thermal (Heat) Energy?
State the amount of energy needed to raise a 5.5 g SILVER dollar by 34 C to 595 C.
What is 43.01 J?
Solution:
Q=mc△T
Q= 0.0055 (230)(34)
Q= 43.01 J
A box has a mass of 5.8kg. The box is lifted from the garage floor and placed on a shelf. If the box gains 145J of potential energy, how high is the shelf?
What is 2.55m?
Solution:
PE = MGH
145 = 5.8 (9.8) (H)
H = 2.55 m
Rubbing your hands together
What is heat energy?
Energy must be expressed in the following units:
What is Joules?