Energy
Capacity to do work — introduction to work and energy
“If a man will begin with certainties, he shall end in doubts; but if he will be content to begin with doubts, he shall end in certainties.”
— Francis Bacon, The Advancement of Learning
What happens to the speed of the particles in the balloon when it enters the liquid nitrogen?
Flowers in Liquid Nitrogen
Light can be converted to heat energy which can apply a force and make something move.
Radiometer
Gasoline is a form of energy because it can do work.
Car Engine — by Don Ion
Levers give you a ‘mechanical advantage’
[ Flash ]
Work always involves some tradeoff. Name 2 ways 1st gear is different than 10th gear.
1st gear requires a small force and a lot of pedaling,
while 10th gear requires little pedaling but a larger force.
I) Work
when a force F acts parallel to the motion of an object over a distance d.
Work is positive when the force acts in the same direction as the object’s motion…
(When the weight is lifted up)
…and negative if the force acts opposite to the direction of the object’s motion.
(When the weight is brought down)
