These are the two variables that kinetic energy is dependent upon
What are mass and velocity?
100
This is the equation for gravitational potential energy
What is PE=mgh
100
A ball is sitting on a ledge. What is the kinetic energy of the ball, if the potential energy it had before it was dropped was 30 J.
What is 30 J?
100
This is the unit for power.
What is Watt (or Joule/sec)?
200
This is the relationship between Work and Energy
energy is the ability to do work
200
This is the amount that kinetic energy changes when the velocity of an object is tripled.
What is increased x9?
200
This is how much potential energy is gained by a 150 kg climber that scales a 100 m cliff.
What is 147,000 J?
200
true or false: Energy in a system can change constantly, but always the total amount is the same.
true
200
This is the power exerted by lifting a 50kg barbell 1.6 m high in 0.8 s.
What is 98 W?
300
If a neighbor pushes a lawnmower four times as far as you do but exerts only half the force, this is the person who has done more work...and by this much.
The neighbor ... 2x as much work
300
This is the amount of kinetic energy of a 65kg sprinter running at 8.4 m/s?
What is 2293.2 J?
300
define potential energy and give one example where potential energy occurs
what is stored energy. one place is the top of the highest hill of rollercoaster before the car(t) goes down the hill
300
Name 3 types of kinetic energy?
what is light energy, mechanical energy, rolling energy.
300
This is how many joules of energy a 60W light bulb can produce in 25 minutes.
What is 90,000 J?
400
This is how much work is done on a 50kg wagon that is pulled with 400 N of force. The wagon moves 5m across a dirt path.
What is 2000 J?
400
define kinetic energy.
energy in/of motion
400
Determine the gravitational potential energy of a guillotine if the mouton (the weighted blade) has a mass of 40 kg and is raised 2.5 m above the neck of the condemned.
What is 980 J?
400
An automobile engine delivers 50 hp of power. This is how much time it will take for the engine to do 6.4 x 10^5 J of work.
(1 hp = 746 W)
What is 17.2 s?
500
This is the amount of net work done on a box that moves 20m and is pushed with a 350N horizontal force and has 120 N of friction force acting upon it.
What is 4600 J?
500
This is the kinetic energy of a 9kg bowling ball that has a velocity of 3 m/s for 3.7 sec.
What is 81 J?
500
This is the change in potential energy when a 49 kg rock, initially 200m above the ground, falls to a ledge 138 m above the ground.
What is 29772.4 J?
500
A plane is flying at 480 m/s at an altitude of 987 m when it drops a 128 kg box. This is the velocity of the box when it hits the ground.
What is 500 m/s?
500
This is how long it takes a 19 kW steam engine to do 6.8 x 10^7 J of work.