Law of Conservation of Energy
The definition of the law of conservation of energy
What is: the total energy of an isolated system remains constant
What is: energy can neither be created not destroyed, it can only be transformed
The formula for gravitational potential energy
What is PE = mgh ?
For an object falling to the ground, this is where the object will have the most kinetic energy.
What is just before hitting the ground?
While he and his family are moving, Joshua drags his suitcase 12 m from the front door to the car at a constant speed. It takes him 16 s to reach the car pulling with a horizontal force of 87.0 N.
This is the amount of work that Joshua does on the suitcase.
What is 1044 J
While he and his family are moving, Joshua drags his suitcase 12 m from the front door to the car at a constant speed. It takes him 16 s to reach the car pulling with a horizontal force of 87.0 N.
This is Joshua's power output.
What is 65 W?
For a falling object, this is the position where kinetic and potential energy will be equal
What is the midpoint
For an object falling to the ground, the position where the potential energy is at its lowest
What is at the ground?
The definition of kinetic energy
What is "moving" energy
Aimee does 5.0 J of work to move her dresser drawer a distance of 2.4 m in a time of 8.0 s.
This is the amount of force she exerted.
What is 2.1 N ?
Aimee does 5.0 J of work to move her dresser drawer a distance of 2.4 m in a time of 8.0 s.
This is the power Aimee developed in that time.
What is .625 W
A roller coaster with a mass of 50. kg is moving with a speed of 10 m/s at the top of a 12-meter drop.
This is the total energy of the roller coaster when it reaches the bottom of the drop. (neglect friction)
What is 8,505 J?
A compressed spring that obeys Hooke's law has a potential energy of 18 J. If the spring constant of the spring is 400 N/m, find the distance by which the spring is compressed.
What is .3 meters?
A 4 kg ball is on a 5-m high ledge. If it falls off the ledge, this is the kinetic energy it will have just before hitting the ground.
What is 196 J?
The formula for calculating work done on an object.
What is W = Fd
The amount of energy used when a 60-watt bulb runs for 5 seconds.
What is 300 J
A black toy truck with a mass of 6.0 kg is at rest when it is struck by a red truck with a mass of 8.0 kg and moving at 10. m/s to the right. After the collision, the trucks stick together and their new velocity is 5.0 m/s to the right.
This is the amount of energy transformed into internal energy during the collision.
What is 200 J?
Mr. Ivers gains 3,025 J of potential energy when he moves 3.2 m up the stairs to the 1st floor. This is his mass.
what is 96 kg?
A rolling ball has 18 J of kinetic energy and is rolling 3 m/s. This is the mass of the ball.
What is 4 kg?
The formula that describes the Work-Energy Theorem
W = ΔET
You hold a 30 N box in place by pushing down on on it for 2.0 minutes.
This is the amount of power.
What is 0 W
A 25 kg ball is thrown vertically into the air with a speed of 10. m/s. Calculate how high it travels.
What is 5 meters?
Which has more potential energy at a height of 10,000 km: an empty plane or a full plane?
a full plane
A 2.3 kg mass attached to a horizontal spring with spring constant 54 N/m, is released 0.42 m from its equilibrium position. (neglect friction)
This is the mass's speed as it passes through its equilibrium position.
What is 2 m/s ?
Person A and Person B are competing against each other, they both can lift 75 kg boxes 3.5 m off of the ground. Person A lifts her box in 1.5 s and Person B lifts his box in 2.4 s. This person does more work.
What is NEITHER
Person A and Person B are competing against each other, they both can lift 75 kg boxes 3.5 m off of the ground. Person A lifts her box in 1.5 s and Person B lifts his box in 2.4 s. Which person uses more power??
Who is Person A