# Essay about Physical Science Study Guide

Submitted By briannnaraee
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Pages: 3

Motion Unit:

-Displacement includes distance and direction
Displacement is the measure of how far an object has moved.
The direction and length of a straight line from the starting point to the ending point of an object's motion is displacement.

-Motion occurs when there is a change in position

-Formula to calculate speed, distance or time is (s=d/t)

-The velocity of an object must have both a speed and direction
Velocity is the speed and direction in which an object moves.
If you are trying to get out of the way of a storm, you would need to know the velocity in which it was moving.
The formula for velocity is (v=d/t)
Velocity determines the direction of motion and speed does not.

-The distance and object travels per unit of time is speed.

-If there is a horizontal line of a distance-time graph, this means that the velocity is 0.
If there is a constant slope on a distance-time graph, this means that there is a constant speed.

-The motion of an object can look different to different people observing because of frames of reference.

-The SI unit for measuring distance is the meter

-Displacement and velocity are both examples of Vectors because they have both magnitude and direction -What is a vector????

Vocabulary: Velocity-Speed of an object and the direction of its motion Distance-The measure of how far an object has moved Instantaneous Speed-The rate of change in position at a given point in time Displacement-The distance and direction an object moves from its starting point. Average Speed-The total distance an object travels divided by the time of travel. Speed-The rate of change of an object's position Rate-any change over time Constant Speed-An object that is neither speeding up nor slowing down travels at a constant speed. Distance-Time Graph-A graph with distance on the vertical acis and time on the horizontal axis

Forces Unit:

-Forces ALWAYS act in pairs.

-Acceleration is defined as the rate of change in velocity.

-The greater an object's mass, the stronger the gravitational force on it is.

-Unbalanced forces acting on an object cause them to accelerate.
Earth exerts unbalanced forces on a ball that is thrown in the air.

-Forces that are equal in size but opposite in direction are called balanced forces.

-Friction is a force that slows down the motion between two surfaces that are in contact.

-The force of gravity: 9.8 m/s2

-Newton's first law of motion: States that an object stays in constant motion unless an unbalanced force acts on it.

-Newton's second law of motion: States that a larger force acting on an object causes a greater acceleration of that object.

-Newton's third law of motion: __________________________________________________
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Vocabulary: Unbalanced forces- The net forces on an object are not zero Balanced