Physical Science Ch.15 Sections 1 & 2
A 0.15 kg. ball is dropped from the top of a 150m. building. What is the kinetic energy of the ball when it passes the sixteenth floor at a height of 63m.?
130 J
A 50 kg. wolf is running at 10 m/sec. What is the wolf's kinetic energy?
2500 J
Which of the following is not an example of kinetic energy being converted to potential energy? a) a basketball player jumping for a rebound b) releasing a compressed spring c) squeezing a rubber ball d) pulling a sled up a hill e) a swing moving upward
b) releasing a compressed spring
Energy stored in the bonds b/w atoms is called
chemical energy
Which form of energy does a plant store when light is transformed during photosynthesis
chemical energy
The law of conservation of energy states that
energy cannot be created or destroyed
The energy of a moving object is ___
kinetic energy
If the speed of an object doubles, its kinetic energy ____
quadruples
An example of electromagnetic energy is ____
sunlight
Mechanical energy is
the sum of the kinetic and potential energy of an object
Most renewable energy originates from
the sun
where does the pendulum have maximum potential energy?
a and e (at the ends)
An example of the conversion of gravitational potential energy into kinetic energy is
a falling raindrop
An example of an object having elastic potential energy is___
a stretched spring
Which of the following energy resources accounts for most of the world's present energy use?
fossil fuels
