Science Midterm Vocabulary

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Physical Science

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19 Terms

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Acceleration
A change in the velocity(speed, direction or both) of a body
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Density
An object's mass divided by its volume; a measure of how many particles are packed together into a certain amount of space
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Force
A pull or push that is applied to an object
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Gravity
A force that exists between any two objects that have mass
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Magnitude
Size of ground movement caused by seismic waves due to energy released
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Mass
The amount of matter in an object
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Motion
A change in the position of an object compared to another object
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Speed
Distance traveled per unit of time
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Thrust
A reaction force that pushes an object forward
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Velocity
The speed and direction of moving objects
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Frame of Reference
An item against which the motion of an object can be measured
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Friction
A force that opposes the motion of a body across a surface or through a gas or liquid
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Weight
The force of gravity on an object
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Free Fall
Downward motion with only the force of gravity
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Potential Energy
The amount of energy that is stored in an object; energy that an object has because of its position relative to other objects
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Kinetic Energy
The energy an object has due to its motion
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Newton's 1st Law
An object will not change its motion unless a force acts on it
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Newton's 2nd Law
The force on an object is equal to its mass times its acceleration
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Newton's 3rd Law
There is an equal and opposite reaction for every action