Vocab
A type of energy where the molecules/particles vibrate and cause heat from friction.
Thermal (heat) Energy
How much work is done if a kid moves a rock 13 m, with the force of 14 N?
182 Joules
What is the difference between kinetic and potential energy?
Kinetic is in motion, potential is stored.
What is the unit for power? (full word)
Watts
This is the name of the mathematical formula for when output force is divided by input force.
Mechanical advantage
What is the work done if the power was 700 watts and time was 5 s.
3,500 j
When is gravitational potential the highest and kinetic energy the lowest in an energy model?
When the height is the greatest.
What is someone's mass in kg if they weight 735 N?
75 kg
This is the name of the mathematical formula that determines the productivity or effectively of a simple machine.
Efficiency
How big is the output force of a machine if the input force is 30 N and the mechanical advantage is 3?
90 N
Give one example of the law of conservation of energy.
pendulum - GPE to KE and back and fourth
other examples...
What is the number and unit we use to quantify earth's gravitational pull?
9.8 m/s^2
The type of potential energy that is dependent on height.
Gravitational Potential Energy (GPE)
How tall is the hill that a skier is sitting at the top if their mass is 76 kg and the gravitational potential energy is 63,500 j.
85.25 m
Although our eyes tell us a blue shirt is blue, what color is the shirt actually?
Every color BUT blue!
(blue is reflected but every other color is absorbed)
What is the formula for Kinetic energy?
KE = 1/2 x m x v^2
This is a law that states that energy can't be created or destroyed... just transferred into different forms.
Law of conservation of Energy
What is the kinetic energy of a boulder rolling down a hill if its mass is 450 kg and velocity is 40 m/s?
360,000 J
What kind of energy goes into a lamp and what kind of energy goes out?
IN: electrical
OUT: radiant and thermal
How many Joules of energy are in 1 food calorie?
4000J - 4184J