The kinetic energy from an object's motion always changes when which factors change? (Hint: 2 answers)
What are mass and velocity?
100
How much work is done on an object if the applied force is perpendicular to the direction of motion?
What is zero?
100
What factors determine the gravitational potential energy that an object has?
What are mass, gravity, and height?
100
The rate at which work is done.
What is power?
100
The amount of energy needed to lift a phone off the floor.
What is one Joule?
200
If you pull a pendulum bob to a position where it has 50 J of gravitational potential energy right before your release it, how much kinetic energy will the bob reach once it passes through its lowest position?
What is 50 J?
200
How much work is done lifting a 9.10-kg box straight up onto a shelf that is 1.80 m high?
What is 160J?
200
Penny "A" reached a height of 4 meters while penny "B" only reached 1 meter. What can be said about the deflection of the ruler used to fling the pennies?
What is "the deflection of the ruler was larger for penny A"?
200
The ability to do work.
What is energy?
200
Mr. Barajas has repeated a "bazillion" times that "when you do any calculations, you must use these units. (Two answers)
What are kilograms and meters?
300
Which sequence describes the energy conversions in a car coasting downhill, and that brakes to a halt?
A) GPE --> KE --> GPE
B) GPE --> KE --> Thermal energy (heat)
C) GPE --> Thermal energy --> KE
What is "B"
300
A hill has three paths to get to the top. The following are the steepness angels:
Path A: 10 degrees
Path B: 20 degrees
Path C: 45 degrees
Which path will require the most work done to get to the top?
What is neither?
The height is what we care about.
300
About 50,000 years ago, a 20,000,000-kg meteor impacted Arizona. Its impact with earth resulted in a 170-meter deep crater. How can a meteor of smaller mass leave the same size crater?
What is "by having a greater velocity"?
300
An applied force through a distance.
What is work?
300
A student walks to school at a speed of 2m/s. If the student's mass is 50 kg, what is the kinetic energy from the student's forward motion?
What is 100 J?
400
A lead ball and an aluminum ball have the same amount of gravitational potential energy. If the Lead ball has a mass of 4 kilograms, and if the aluminum ball has a mass of 1 kilogram, what can be said about their heights?
What is "the aluminum ball is 4 times higher than the lead ball"?
400
If you do 8000 Joules of work on a crate while applying a 2000-N force to it, how far will the crate move?
What is 4 meters?
400
Sadie can run up a flight of stairs in 3 seconds while Dulce takes 4 seconds. If both do 1000 J of work to run up the flight of stairs, which one has the higher power output?
Who is Sadie?
Sadie: 1000J/3seconds = 333.3 watts
Dulce delivered: 1000J/4seconds = 250 watts
400
The energy due to motion, and the energy due to the gravitational force between objects.
What is kinetic energy, and what is gravitational potential energy?