Kinetic/Potential Energy
As the cart on a roller coaster moves downward the kinetic energy _________
A. Increases
B. Decreases
A. Increases
warmer, cooler, are the same
Which of these has the most kinetic energy? Choose the correct answer.
A.a 25 kg fish tank sitting on a table
B. a 50 g fish swimming in a fish tank
C. a 7,500 kg car parked on a steep hill
D. a 50 kg boulder suspended from a cliff
B
The court on a roller coaster has the greatest amount of potential energy when it is at the _______
A. Top
B. Bottom
A top of the roller coaster
On a sunny day, the sidewalk and the street are both warmer than the atmosphere because they have more (heat/thermal energy) due to transfer by (conduction/radiation) from the sun
Thermal energy/radiation
A sea bird builds its nest on a ledge above the ocean, where it fishes for food. When does the bird have the most potential energy? Choose the correct answer.
A. flying at 10 m/s 10 m above the ocean
B. sitting in its nest 20 m above the ocean
C. swimming on the ocean surface at 2 m/s
B
The roller coaster requires an input of energy from a motor to reach the top of the first hill. Which statement describes the transformation of energy involved in this process?
A. Mechanical Energy is transformed into electrical energy
B. Electrical energy is transformed into chemical energy
C. Electrical energy is transformed into mechanical energy
D. No energy transformation occurs
C
When thermal energy increases what happens to the particles inside the object? How do those particles begin to move?
When thermal energy increases, it means the kinetic energy increased so the particles inside the object begin to move faster
What is the equation to solve for kinetic energy?
Explain the difference between potential and kinetic energy.
Potential energy depends on an objects height and mass. Potential energy is greater the higher the object is and the more mass it has. Kinetic energy depends on speed/velocity and mass. The faster an object is traveling or the more mass an object has, the greater the kinetic energy
Explain the definitions of conduction, convection, and radiation
Conduction- Energy is being transferred through touch.
Convection- Energy transferred through gas or liquid
Radiation- Energy through electromagnetic waves
A girls is pushing a 5kg wagon. The wagon is moving at a constant speed of 2.0 m/s. Calculate the combined kinetic energy the wagon. KE=1/2MV^2
10
What two factors affect kinetic energy?
What two factors affect potential energy?
Kinetic energy-Speed/velocity and mass
Potential energy- Mass and height
Describe situations in which energy is transferred through conduction, convection, and radiation
Conduction- Touching- you touch a cold desk and your hand begins to feel cold.
Convection- Hot water rises when it boils
Radiation- Solar panels being powered by the sun
The boy has a 6kg ball and throws it at a speed of 4m/s what is the balls kinetic energy? KE=1/2MV^2
48