General
What is an example of a simple machine?
Possible answers: lever, wheel and axle, screw, pulley, inclined plane, wedge
What is kinetic energy?
Energy of motion
Does heat transfer from hot to cold or cold to hot?
Hot to cold
What are the three types of heat transfer?
Conduction, Convection, Radiation
How much work is done when a 10 N box is lifted 5 m?
50 J
Scissors, wheelbarrow, etc.
What is potential energy?
Stored energy
If you put ice in your drink, does heat go to the drink or the ice?
Ice
What type of heat transfer is happening when you put your hand on a desk?
Conduction
What's the efficiency of a machine with a work output of 90 J and an input of 120 J?
75%
What must be happening for you to be doing work?
When you're swinging, where is your potential energy the highest?
When you are the furthest off the ground
What does the second law of thermodynamics state?
Heat is transferred from hot to cold
What type of heat transfer is happening when you microwave some food?
Radiation
What is the gravitational potential energy of a 60 kg rock sitting at the edge of a 80 m high cliff?
47,040 J
What does the law of conservation of energy state?
Energy cannot be created or destroyed
When you are on a roller coaster, when is potential energy decreasing and kinetic energy increasing?
When you go downhill
What is the average kinetic energy of an object?
A. Thermal Energy
B. Temperature
C. Heat
D. Conductor
What type of heat transfer is happening when your heater warms your house?
Convection
What's the kinetic energy of a 1,000 kg car traveling 30 m/s?
450,000 J
How do you get energy?
Food! (it's chemical energy)
What are three types of potential energy?
In the Road to More Energy article, we read that energy collected by solar panels in the road could be used to provide energy to the buildings around the road. The energy transformation in this situation is from ___________ energy to __________ energy.
Radiant; electrical
What type of heat transfer is happening when you leave food under a heat lamp?
Radiation
How much thermal energy is transferred if a block of copper with a mass of 60 kg is heated from 30°C to 100 °C if the specific heat of copper is 0.386 J/kg°C?
1,621.2 J