Harnessing Human Energy
The energy an object has because it is moving.
kinetic energy
A force between an object and the surface it is moving over.
friction
To push objects away from each other.
repel
A spectroscopist is a scientist who studies ________ and how it/they interact with materials.
light
The nearly circular path a smaller object (like the Moon) travels around a larger object (like Earth).
orbit
The energy that is stored in an object or system.
potential energy
The amount of matter that makes up an object.
mass
If a student puts the South Pole of two magnetic toys very close to each other what will happen next, and why?
The two toys will move away from each other because the magnetic force will push them apart.
Light travels in a ________ line.
straight
During a lunar eclipse, the Moon is completely dark because
Earth blocks sunlight from hitting the Moon.
A machine that can convert, or change, kinetic energy into electrical energy.
generator
The moment when two objects hit each other.
colission
A line that connects opposite magnetic poles and represents the strength and direction of the magnetic field.
magnetic field line
The distance from one peak of a wave to the next.
wavelength
How long does it take for the Moon to orbit Earth?
about one month
The ability to make things move or change in the future even if it is not moving or changing now.
potential energy
If the same strength force is exerted on two objects but the objects have different masses, the object with less mass will have a greater change in ________.
velocity
Where there is a/an ________ force between opposite poles of magnets, the field lines are drawn to connect magnets.
attractive
When light is transmitted through or reflected off a material, the energy is not absorbed, so the material ______ change.
doesn't
The sun is about ______ times larger in diameter than the moon.
400
Energy can be ________ from one object to another, and energy can be converted from one type to another.
transferred
Even though the force exerted on each object in a collision is the same strength, if the objects have different masses, their changes in velocity will be ________.
different
A spaceship is traveling through space. Suddenly, its kinetic energy decreases. What is most likely to be true about the speed of the spaceship?
The speed decreases as the kinetic energy decreases.
When a light wave hits a material, the light can be ______ by the material, ______ through the material, or ______ off the material.
absorbed, transmitted, reflected
The Moon is positioned between the Sun and the Earth so that the side of the Moon that is viewed from Earth cannot be seen. Because of this, there appears to be no Moon in the night sky.
New Moon