Energy
Name a type of energy?
We learned about so many!! Hope you remembered one.
What is the biggest bird?
The ostrich
Molly wants to know the difference between using a 60-W and 100-W lightbulb in her lamp. She calculates the energy it would take to use each bulb for 30 days by using this equation:
Power = Energy transferred (J)/time (s)
What is the difference in the amount of energy transferred by the two bulbs during this time?
1200 J
Jazlyn is training for her first half-marathon, which requires her to run 21.1 km. Before she runs, she carefully chooses the foods that will give her the energy her body requires for the race. She stands still at the starting line, then she starts running, her body warming up as she runs.
Which three energy transformations take place in this example?
A. chemical energy to kinetic energy
B. chemical energy to thermal energy
C. mechanical energy to chemical energy
D. potential energy to kinetic energy
chemical energy to kinetic energy
chemical energy to thermal energy
potential energy to kinetic energy
At what point on a roller coaster does it have the greatest potential energy?
At the highest point on the track
While Cash was working in the garden, he pushed a shovel into the ground to dig a hole in the dirt. He picked up a shrub, carried it to the hole, and held it while he lowered it into the hole. During which parts of this process does Robert NOT do work? Choose the two statements that apply.
A. He pushed a shovel into the ground to dig a hole.
B. He picked up a shrub.
C. He carried it to the hole.
D. He held it while he lowered it into the hole.
C and D
How many hearts does an octopus have?
3
In 1973, the horse Secretariat set a record that still stands. This 500-kg horse ran the 2000-m track in 120 s. What was Secretariat’s average kinetic energy?
(1 kJ = 1000 J)
69kJ
Explain how energy is conserved in a roller-coaster ride. Include descriptions of at least one energy transfer and at least two energy transformations.
Ask Mrs. Cates if you are correct.
At what point on a roller coaster track does it have the greatest the greatest kinetic energy?
At the lowest point on the track
John David is hanging a porch swing on his front porch. The first thing he has to do is attach two springs to the ceiling. Then, he fastens the swing to the springs so that they can stretch and support the weight of the swing. Which two types of potential energy do the springs have?
A. elastic
B. gravitational
C. kinetic
D. stretched
A and B
What are the three primary colors?
Red, blue, and yellow
Chance has learned how to drop an egg without breaking it. After 0.2 s, the kinetic energy of the falling egg is 0.5 J. If its mechanical energy is 2.3 J, what is its potential energy?
1.8 J
What is the law of conservation of energy?
Energy cannot be created or destroyed.
Energy of motion is which type of energy?
Kinetic
Sunlight enables plants to use water and carbon dioxide during photosynthesis to make and store sugar. Any animal that eats the plants can convert the sugar into the energy it needs to move from place to place. Which three types of energy are involved in this example?
chemical
electromagnectic
kinetic
How many teeth does an adult human have?
32
What is the formula for gravitational potential energy?
Weight x Height above ground level
In a pendulum, where is the lowest potential energy found?
When it is hanging !!
Energy that is stored in bonds between atoms is:
Chemical
Gravitational potential energy is affected by the object's weight and ____________.
Height
What is the longest river in the world?
The Nile
The formula for kinetic energy is___________-.
1/2 x mass x speed2
What is energy?
The ability to do work.
As an object's thermal energy increases, its particles move_________.
Faster