Formulas
What is the formula for work?
W=Fd
A jogger with a mass of 90.0 kg is moving forward at a speed of 2 m/s. What is the jogger’s kinetic energy from this forward motion?
180 J
A ______________ is a device that can increase distance, increase force, or change direction.
machine
____________________ is the transfer of energy in the form of electromagnetic waves.
Radiation
Name one example of how animals control heat
fur, fat layer, reflective scales
What is the formula for efficiency?
e = output/input x 100
You do 78 J of work pushing a box up a ramp. If the output work from the inclined plane is 13 J, then what is the efficiency of the inclined plane?Round to the nearest whole number.
17%
The law of conservation of energy states that
energy cannot be created or destroyed
a material that does not allow thermal energy to be transferred through it easily.
thermal insulator
Name on example of how people control heat
wearing jackets, using an oven mitt
In the heat formula, what does the "C" stand for?
specific heat
You push a refrigerator with a horizontal force of 100 N. If you move the refrigerator a distance of 5 m while you are pushing, how much work do you do?
500 J
A combination of two or more simple machines is a
compound machine
a metal spoon is an example of a good thermal _______
conductor
The unit used to measure heat is
Joules
What is the formula for kinetic energy?
KE = 1/2 mv2
A 4 kg ceiling fan is placed 2.5 m above the floor. What is the gravitational potential energy of the Earth-ceiling fan system relative to the floor?
98 J
______ is a measure of the average kinetic energy of all the particles that make up an object.
Temperature
Rainforests near the equator are a result of
convection
The unit used to measure force is
newtons
What is the formula for heat?
Q=m(tf - ti)C
5 g of copper was heated from 20°C to 80°C. How much energy was used to heat Cu? (Specific heat capacity of Cu is 0.092 J/kg °C)
27.6 J
______ is the study of the relationship between heat, work, and thermal energy
Thermodynamics
Feeling the heat from a campfire is the result of thermal _______
radiation
Name an example of materials used in active solar heating
a solar panel/collector