Harnessing Human Energy
Whenever something moves or changes, it is because of ______________.
Energy
A ___________ is required to change the velocity of an object.
Force
A ____________ force can attract or repel an object at a distance.
Magnetic
When a thing gets hotter, its molecules are moving _____________and have more kinetic energy.
Faster
A solid holds its shape and has a definite ___________.
Volume
When something is moving, it has _________ energy.
Kinetic
A stronger force can cause a greater change in _______________.
Velocity
In a system of magnets, there is a __________ force between like poles and an attracting force between opposite poles.
Repelling
_____________ is a measure of the average kinetic energy of the molecules of a thing.molecules of a thing.
Temperature
A phase change is when the molecules that make up a substance experience a change to their __________ of movement.
Freedom
When something has the ability to make things move or change in the future, it has ____________ energy, even if it is not moving or changing now.
Potential
If the same strength force is exerted on two objects but the objects have different masses, the object with less mass will have a ___________change in velocity.
Greater
A magnetic force can convert potential energy stored in a magnetic field to ____________ energy.
Kinetic
The molecules of a system will transfer energy until the system reaches a stable state known as ________________, in which all of the molecules are moving at about the same speed.
Equilibrium
A phase change occurs when the kinetic energy increases enough to overcome the ___________ between molecules.
Attraction
Energy can never be _________ or ___________. If something has energy, the energy must have been transferred from something else.
Created or Destroyed
When two objects collide, a force is exerted on each object. The two forces are exerted in opposite directions, but they are _____________.
Equal
Moving a magnet against a stronger magnetic force transfers more energy to the magnetic __________.
Field
When two things are in contact, their molecules collide, and kinetic energy transfers from the faster-moving molecules to the ________________ molecules.
Slower-Moving
Different substances can have either weaker or __________ molecular attraction.
Stronger
Energy can be transferred from one object to another, and energy can be ____________ (converted) from one type to another.
Transformed
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 magnetic force is _____________ closer to a magnet.
Stronger
For things at the same temperature, the thing with more molecules has more ___________ __________ than the thing with fewer molecules.
A liquid has a __________ volume and can take the shape of its container.
Definite