PHYSICS BIMESTER 1

By Nancy Barbosa

SCIENTIFIC INQUIRY pgs. NOS 6 to NOS 8 A process that uses a variety of skills and tools to answer questions or to test ideas

ASK QUESTIONS Observations: the result of using one or more of your senses to gather information and taking note of what occurs. Observations often lead to questions . An inference is a logical explanation of an observation that is drawn from prior knowledge or experience.

HIPOTHEZISE AND PREDICT After making observations and inferences you might develop a hypothesis a possible explanation for an observation that can be tested by scientific investigation. Make predictions a prediction is a statement of what will happen next in a sequence of events.

TEST HIPOTHESIS AND ANALIZE RESULTSWhen you test a hypothesis, you often test your predictions. To test your predictions a hypothesis you could design an experiment. After doing an experiment or research you need to analyze your results and findings.

DRAW CONCLUSIONSAfter analyzing your results you can begin to draw conclusions. A conclusion is a summary of the information gained from testing a hypothesis.

COMMUNICATE RESULTSSharing the results of a scientific inquiry.

SCIENTIFIC LAW Rule that describes a repeatable pattern in nature. States that an event WILL occur.

SCIENTIFIC THEORY An explanation of observations or events that is based on knowledge gained from many observations and investigations. An explanation of WHY or HOW an event occurred.

BOTH ARE BASED ON REPEATED OBSERVATIONS

Technology is the practical use of scientific knowledge especially for industrial or commercial use

Critical thinking is comparing what you already know with the information you are given in order to decide whether you agree with it .

POSITION AND MOTION pgs. 9-13

A reference point is the starting point you choose to describe the location or position of an object

A position is an objects distance and direction from a reference point

The description of an objects position depends on the reference point When you describe an objects position you compare its location to a reference direction. The reference direction is the positive + and the opposite direction is the negative –

A REFERENCE POINT, A REFERENCE DIRECTION AND DISTANCE ARE NEEDED TO DESCRIBE THE POSITION OF AN OBJECT !

Motion is the process of changing position. An object is in motion if its position changes relative to a reference point Displacement is the difference between the initial and the final position of an object Distance is the length of the path taken

Distance is a measurement of the length between two points. Distance does not include a direction. Measurements that do

not include a direction are called scalars.

Displacement is the overall change of position of an object. Distance compares the ending position of an object to the starting

point of the object. Displacement includes a direction. Measurements that include a direction are called vectors.

SPEED AND VELOCITY pgs. 17-21

SPEED is a measure of the distance an object travels per unit of time

Cover the word you want to find and that’s the formula! Speed : distance/time. Time : distance /speed. Distance :speed x time

The SI unit for speed is meter per second(m/s)

CONSTANT SPEED is the rate of change of position in which the same distance is raveled each second

INSTANTANEUOS SPEED is speed at a specific instant in time

AVERAGE SPEED is the total distance traveled divided by the total time to travel that distance ( distance /time)

You can use distance-time graphs to compare the motion of two different objects You can use distance-time graphs to calculate the average speed of an object

VELOCITY is the speed and the direction of a moving object . vector

ACCELERATION

ACCELERATION is a measure of the change in velocity during a period time

Like velocity, acceleration has a direction and can be represented by an arrow

Acceleration = vf-vi DON’T FORGET TO WRITE METERS PER SE SQUARED ______ T

A SPEED TIME GRAPH has time on the horizontal axis –x And speed is on the vertical axis – y

An object accelerates if it speeds up , slows down or changes direction

Acceleration in a straight line can be calculated dividing the change in speed by the change in time

A SPEED -TIME GRAPH shows how an objects speed changes over time .

Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.

SI prefixes

VECTORS

Graphical method