Calculating Energy
In the equation for gravitational potential energy, "g" stand for
Gravity and the gravity on Earth accelerates dropped object by a value of 9.8 m/s2
How is thermal energy similar to kinetic energy.
thermal energy is the sum of all the kinetic energy of the particles in an object.
What phase transition is described by freezing?
a liquid turning into a solid
When thermal energy is transferred by contact
Conduction
The temperature where all the motion of molecules halts.
Absolute zero
A rock has a mass of 5 kilograms and it falls from a height of 2 meters, how much gravitational potential energy does the rock have before it fell?
98 Joules
PE = m(g)(h)
PE = 5(9.8)(2)
PE = 98 J
How is temperature different from thermal energy?
Temperature is the AVERAGE kinetic energy of the particles in an object.
Thermal energy is the SUM of all the kinetic energy of the particles in an object.
What is it called when a gas transitions into a liquid?
condensation
Kinetic theory describes this state of matter as having enough kinetic energy to partly overcome the forces of attraction as the particles can slide past each other, but not pull away completely.
liquid
This state of matter is described as having a fixed volume, but no fixed shape
liquid
A car is moving at a speed of 15 m/s, if the car weighs 1500 kg how much kinetic energy does it have?
168,750 Joules
KE = 1/2 m (v)2
KE = 1/2(1500)(15)2KE = 168,750 J
A momma bear has double the mass of a baby bear. If the mom bear has a temperature of 98oF and the Baby bear has a temperature of 99oF. Which bear has more thermal energy: momma bear, baby bear, or is it the same?
Momma Bear has more thermal energy because she has more mass than baby bear.
What phase transition describes a gas turning into a solid?
Deposition
Heat can travel as this kind of radiation?
Infrared radiation
A measure of energy in transit between a system or area with higher kinetic energy and one of lower kinetic energy
Heat