Kinetic Energy
Kinetic energy is the energy due to _______.
What is motion (movement)
True or False
The potential energy of an object depends on its position.
What is true.
Objects held above the surface of the Earth always have this form of potential energy.
What is gravitational potential energy.
There is a parked semi-truck and a car moving at 50 mph.
Which has the greater amount of kinetic energy?
What is the car?
If an object is not moving, what type of energy can it NOT have?
What is kinetic energy?
This type of potential energy is stored in objects that are compressed or stretched, such as springs and rubber bands
a) gravitational potential energy
b) elastic potential energy
c) Magnetic potential energy
What is Elastic Potential Energy.
This type of potential energy is found when stretching a rubber band, or when compressing a spring.
What is elastic potential energy?
In the rack there is a helmet and a pair of skates. The mass of the helmet is 550 g and the mass of the skates is 2,000 g. Which item has more potential energy? How can you tell?
The skates because they have more mass.
What are the two factors that impact how much kinetic energy an object has?
What is mass and speed?
These two factors impact the amount of gravitational potential energy an object has.
What is mass and distance.
This type of energy is NOT an example of potential energy.
a) gravitational
b) magnetic
c) chemical
d) rotational
What is rotational?
Rotational is a form of kinetic energy.
Explain what happens to the gravitational potential energy of an object when you increase its distance from the Earth’s surface. What about when you decrease its distance?
When you increase an object's distance from Earth's surface, its gravitational potential energy increases. When you decreases an object's distances from Earth's surface, its gravitational potential energy decreases.
Which would result in a greater increase in kinetic energy of an object? Doubling its mass or doubling its speed?
What is increasing its speed.
A girl has books in her backpack and lifts the backpack to 5 meters.
She then takes the books out and lifts the backpack to 5 meters.
Explain the gravitational potential energy between these two scenarios.
This type of potential energy is due to fields created by objects. These fields are invisible to the eye and extend into space surrounding the object.
What is magnetic potential energy?
You overhear someone say that two objects with the same mass must have the same gravitational potential energy. Do you agree? Why or why not?
It would depend on their position compared to Earth's surface. They would have the same gravitational potential energy at the same height. But if they are at different heights compared to Earth's surface they will have different potential energy amounts.
There are two forms of energy of motion that contribute to the total kinetic energy of an object: translational and rotational.
Give me a real life example of each and explain how there is translational and rotational energy.
Sample answer: A bicycle.
Translational: Moves from point A to point B on a path.
Rotational: The wheels rotate in place around a center axis (or point).
There are two types of systems (open and closed). This system releases energy into the surrounding environment.
What is an open system?
Springs found in mouse traps, luggage scales and mechanical pencils involve this type of potential energy.
What is elastic potential energy?
True or False. (Explain)
If I triple the mass of an object, the kinetic energy is also tripled.
If I triple the speed of an object, the kinetic energy is also tripled.
False. The mass would be tripled, yes. But the when the speed is tripled, the kinetic energy increases by 32 which means the speed would be multiplied by 9.