Work
This is the definition of work involving angles and displacement
What is W=Fd cos (theta) ?
This is the definition of Kinetic Energy
What is the energy of motion?
The equation for Power involving work
What is P = work/time
Gravitational Potential energy is calculated by using the formula
What is Ug = mgh(or y)
This is the equation for the Work done by Gravity
What is W = mg cos 0 (delta Ug)
Rudolph has a mass of 300 kg and can fly at 5 m/s Donner has a mass of 200 kg and can fly at 6 m/s One reindeer has more Kinetic Energy
Who is Rudolph?
Gravitational Potential Energy increases as this happens to an object
What is increasing the height of the object?
The value of the work done by Gravity is positive when
What is decreasing the height of the object?
If you carry a 50kg box 15m along a level horizontal surface, how much work have you done?
What is zero?
Power is defined as
the rate at which work is done
In elastic potential energy, what does the k represent?
What is the spring constant (or how much force is required to stretch or compress it 1 m)?
a 125 kg man climbs down a chimney that is 12 meters tall. The work done by gravity is..
What is 15,000 Joules
If a 2kg box is on a 5m high inclined plane at rest, once set into motion it is going 10m/s at the bottom of the plane, how much work did gravity do on the box?
What is 100J (or 98J is g=9.8)?
True or False Kinetic Energy can be negative
What is False?
How much power is required to take a 1500kg car from 10m/s to 20m/s in 10s?
What is 22500W
[1/2(1500)(202)-1/2(1500)(102)]/10
True or False: An arrow is shot down from a rooftop at a velocity of v, a second one is shot from the same rooftop upward at a velocity of v, a third is shot purely horizontally at a velocity of v. Which arrow has more kinetic energy when it reaches the ground?
What is none of them (they are all the same)?
Ugo + Ko = K for all
A 75 kg student climbed three flights of stairs (each flight is approximately 4 meters). The work done by the student to overcome gravity is...
What is 9,000 J
If you (50kg) are climbing up a rope a distance of 5m, how much work did gravity do on you?
What is -2500J (or 2450J is using 9.8)?
this must be negative!
A 2 kg ball is thrown horizontally at 4 m/s off a 10 meter cliff. It has this much Kinetic Energy when it hits the ground
What is 216J? (or 212J is using 9.8)
Ugo+Ko = K
A 1.25kg ball is whirled in a horizontal circle with a radius of 0.5m at a speed of 2.5m/s. How much work is being done on the ball to maintain this motion?
What is 0?
A jolly 125 kg person holding a sack that weighs 25 kg stands on a rooftop that is 15 meters tall. The potential energy of this person and sack is...
What is 22,500 J
A pendulum of mass m is dropped from a horizontal position where the string of length l is taut can have as much work done by gravity as
What is mgl