Formulas
Units
Concepts
Calculations
Miscellaneous Debris
100
Formula for Kinetic Energy
1/2 mv2
100
SI Base Units for work
Joules
100
When the applied force is perpendicular to movement OR there is no movement at all, work is...
Zero
100
A 10 kg rock is lifted to 2 meters off the ground. What is the rock's potential energy?
200 J
100
When using W = Fd cosΘ, the angle is between the direction of the applied force and what?
Horizontal
200
Formula for work
W = F d
200
SI base units for µ
no units
200
power is ..........
(word definition)
the rate at which work is done
200
An object has 40 J gravitational energy and 20 J of kinetic energy. If the object speeds up on an uneven surface so that the resulting kinetic energy is 35 J. What is the resulting potential energy?
15 J
200
Engine A produces 3x the power of engine B. If it takes engine A 30 seconds to do the work, how long does it take engine B to do the same work?
90 seconds
300
formula for Power
P = W/t
300
Watts is SI unit dimensions for what?
Power
300
if height is doubled, what happens to the potential energy?
Doubled
300
Darth Vader gets pushed 3.5 meters by Luke’s force of 1074N on the Deathstar in 2.2 seconds. Calculate the power expended on Darth Vader
1709 watts
300
Someone is dropping rocks again... if this guy is dropping a 0.055 kg rock off a 3.0 m balcony, what is the KE after the rock falls 2.0 m?
1.1 J
400
Friction Formula
Friction Force = coefficient of friction x Normal Force
400
SI unit dimensions for work?
Joules
400
if velocity is quadrupled, what happens to the KE?
times 16
400
A parent pulls a child in a wagon with a combined mass of 30 kg. If the parent pulls with a force of 19.1 N for 11.0 m and the wagon started from rest, what is the final speed of the child wagon combination?
3.74 m/s
400
A 100 kg sled moving at 5 m/s skids to a stop. How much work is done by friction?
-1250 J
500
conservation of energy formula
KEi + PEi + Wext= KEf + PEf
500
74,600 watt is how much horsepower?
100 hp
500
which color path uses the most power?
yellow
500
A player hits a 0.122 kg baseball over the outfield fence. The ball leaves the bat with a speed of 31.5 m/s & a fan in the bleachers catches it 7.2 m above the point it was hit. Find the velocity just before the ball is caught
29.2 m/s
500
A hang glider is gliding at 500 m with a speed of 20 m/s when it dives to an altitude of 250 m. What is the final speed?
73.5 m/s