Vocab
What does work require?
Force and displacement are parallel.
(force acting upon an object and the object's movement to be in the same direction.)
A 7 kg object is motionless. Calculate kinetic energy.
0 J
A 500 kg roller coaster is traveling 7 m/s at a height of 25 m. Calculate mechanical (total) energy.
134750 J
Which character from The Office does Jim notoriously play pranks on?
Dwight
The energy of motion is called ...
kinetic energy
Work happens when...
The force and displacement are in the same direction.
True or False: Work is equal to a change in energy.
True
A 2.1 kg rock is being held at a height of 8.7 m. Calculate it's potential energy.
179 J
What is the capital city of Kansas?
Topeka
Stored energy is known as
What is potential energy?
True or False? When a force does not act parallel to the direction of motion there is no work done on an object.
True.
You are riding in a roller coaster going up a hill, at the top your car stops briefly before you start racing down to the bottom of the hill. At which point (stopped at the top or stopped at the bottom of the hill) do you have the most potential energy?
stopped at top of hill because it has higher height (GPE = mgh)
A student lifts 5kgs of books 2 meters in 6 seconds, how much work did the student do to lift the books?
98 J
How many NFL teams are there?
32
True or False. (Assume masses are equal.) You and I both move our books upstairs. You get up there in 1 minute while it takes me 1.5 minutes. I am more powerful than you.
False
You are riding in a roller coaster going up a hill, at the top your car stops briefly before you start racing down to the bottom of the hill. At which point (stopped at the top or racing towards the bottom of the hill) do you have the most kinetic energy?
racing towards the bottom of the hill because you are moving
How many Pokémon are in the original Pokémon game?
151
A unit of power which equals to one joule per second
The Watt?
If the force applied to an object that is moved is quadrupled but moved for half the original distance, what happens to the work done?
Twice the Work
A 2.9 kg object has 656 J of kinetic energy. Calculate velocity.
KE = (1/2)mv2
21.3 m/s
Your family is moving to a new apartment. It takes 3 seconds to lift a 10kg box 1.5 meters straight up to put it on a truck. How much power is required to do this?
49 Watts
"What has roots as nobody sees,
Is taller than trees,
Up, up it goes,
And yet never grows?" - J.R.R. Tolkien
A mountain