Types of Energy
A fast racecar has what type of energy?
Kinetic Energy
A person pushes a box, causing it to slide. The work is...
Positive
What is the GPE of a 5 kg object 1 meter off the ground on a planet where g = 10 m/s^2?
50 J
State the law of conservation of energy.
Energy cannot be created or destroyed, it can only change forms
OR
Total energy doesn't change unless acted upon by an outside force.
What is the process by which plants use sunlight to convert water and carbon dioxide into glucose?
Photosynthesis
A flag on top of a mountain has what type of energy?
Gravitational Potential
A cat falls from high up and is sped up by gravity before landing safely. The work on the cat is...
Positive
What is the kinetic energy of a 20 kg object moving at 6 m/s?
360 J
What type of force opposes motion between two objects?
Friction
What do we call the process by which water vapor changes into liquid water?
Condensation
Humans and Batteries store this type of energy.
Chemical Energy
The catcher stops a fastball at home plate which results in an out. The work is...
Negative
What is the spring potential energy of a spring with spring constant k = 10 N/m when it is stretched 3 meters?
45 J
What type of force points away from the ground to stop you from moving through the ground?
Normal
What is the largest organ in the human body (measuring by mass)?
The skin
Name the two types of energy released by the sun.
Light and Thermal Energy
When something loses kinetic energy, the work is...
Negative
An object with 30 J of gravitational potential energy has a mass of 5 kg and is 3 meters off the ground. What is the acceleration due to gravity on the planet?
2 m/s^2
Describe the meaning of Newton's Second law without math or equations.
The acceleration an object experiences is proportional to the force it experiences.
The more massive objects experience less acceleration with the same force.
This is a type of symbiotic relationship where both organisms benefit.
Mutualism
Albert Einstein is famous for an equation which gives the theoretical maximum nuclear energy in an object. What is this equation?
E = mc^2
The teacher pushes on the wall and the wall doesn't move. The work is...
Zero
An 8 kg object has 100 J of kinetic energy. How fast is the object moving?
5 m/s
Name all three of Newton's Laws in order.
1st - Objects in motion stay in motion, objects at rest stay at rest
2nd - F = ma
3rd - Every action has an equal and opposite reaction
What phenomena or concept is responsible for the accelerating expansion of the known universe?
Dark Energy