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Aim: How do scientists solve problems?. The Scientific Method. Do Now:. Copy and Answer the following questions into your notes. Be creative!!!!.

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Do Now:

Copy and Answerthe following questions into your notes. Be creative!!!!

AI live in a country plagued with poverty and overpopulation. The houses in my village are constructed so close together that I get limited sunlight. In fact my elderly neighbor sleeps all day because she is confused as to when its day time or night time. Can u solve my problem?



Cell phones emit radiofrequency energy,

a form of non-ionizing electromagnetic

radiation, which can be absorbed by

tissues closest to where the phone is held.

The amount of radiofrequency energy a

cell phone useris exposed to depends on the

technology of the phone,

the distance between the phone’s antenna

and the user, the extent and type of use,

and the user’s distance from cell phone towers.

Studies have not shown a

consistent link between cell phone

use and cancers of the brain, nerves,

or other tissues of the head or neck.

More research is needed because

cell phone technology and how

people use cell phones have

been changing rapidly. 


Scientific method refers to a body of techniques for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge.


Steps of the Scientific Method

1. Problem

4. Results

2. Hypothesis

5. Conclusion

3. Experiment

6. Repeat

















1. Problem

Stated as a QUESTION.

The problem questions what you are looking to find out.

Example: What effect does the type of gas used have on the gas mileage of a car?

2. Hypothesis

Stated as a prediction. Can be a “If…….then…….” statement.

Includes all aspects of your problem

Example: If high octane gas is used then a car will have the highest gas mileage.


3. Experiment

The point in the experiment in which the hypothesis is tested.

A detailed procedural list must be followed.

4. Results

Any data/observations that have occurred during the experiment which should be recorded.

Results are usually displayed visually in a table and/or a graph.


5. Conclusion

A detailed paragraph that states whether the hypothesis was supported or refuted.

Specific data must be referred to.

Possible sources of error that could have effected the experiment should be mentioned.

6. Repeat

Multiple trials must be performed to prove validity of claim


Aim: How does the Scientific Method work?

When you are finished with your quiz….hand in answers and prepare for today’s notes



Brainstorm ideas for the following example……If a cork is put into a glass of water, the cork will almost always drift to the side of the glass. How can you get the cork to float in the center of the glass? Water, the glass, and the cork are all that is required.


It’s a wicked mega hit that delivers twice the buzz of a regular energy drink.

MONSTER packs a vicious punch but has a smooth flavor


Designing an Experiment

All experiments must :

1. Be controlled.

In a controlled experiment only one variable is tested at a time.

Variable- is the factor in the experiment that could cause change or be changed


Two types of variables

A. Independent Variable

The factor that is purposely altered by the researcher, that may or may not lead to change in the dependent variable. Generally it is the factor that you are testing.

Example 1: the amount of light

Example 2 : the amount of food you eat


B. Dependent Variable

The factor in the experiment that may respond to/ change due to the independent variable.

Example 1: the amount of plant growth

Example 2: your weight


Have two groups; one

  • control group and one
  • experimental group.

A. Control group

The group in the experiment that has all conditions exactly the same as the experimental group, except the independent variable (the factor that is being tested)



Why have a control group?

The control group is used for comparison of results, to determine if the change was caused by the independent variable or not.


B. Experimental Group

The group in the experiment that has all conditions exactly the same as the control group in addition to the independent variable (the factor that is being tested)


A large study group

  • (sample size)

When testing, there should always be a large number of subjects to provide accuracy and reduce any or all biases.

Biases – the preconceived notions that may alter results.


Final Summary

1. Which condition is necessary for an experiment to yield useful data?

  • Similar results should be obtained when the experiment is repeated
  • Only the expected results should be considered each time the experiment is performed.
  • The hypothesis must be correct.
  • The experimental period must be short.
a new concept that is tested in a scientific investigation is known as
A new concept that is tested in a scientific investigation is known as
  • a theory
  • the hypothesis
  • in inference
  • an observation

A scientific study showed that the depth at which algae were found in a lake varied from day to day. On clear days, the algae were found as much as 6 meters below the surface of the water, but were found only 1 meter below the surface on cloudy days. Which hypothesis best explains these observations?

  • Light intensity affects the growth of algae.
  • Wind currents affect the growth of algae.
  • Nitrogen concentration affects the growth of algae.
  • Precipitation affects the growth of algae.
why do scientists consider any hypothesis valuable
Why do scientists consider any hypothesis valuable?
  • A hypothesis requires no further investigation.
  • A hypothesis may lead to further investigation even if it is disproved by the experiment.
  • A hypothesis requires no further investigation if it is proved by the experiment.
  • A hypothesis can be used to explain a conclusion even if it is disproved by the experiment.

The diagram above represents a petri dish containing nutrient agar. A single bacterial colony is growing on the surface of the agar. A mold, represented by the shaded area, is also growing on the agar surface.

  • Which statement best explains why no mold is growing in the white area next to the bacterial colony?
  • The mold cannot use the nutrient agar for food.
  • The bacteria may release a substance that prevents mold growth.
  • The mold is causing the bacterial colony to reproduce faster.
  • The bacteria are scavengers of the growing mold.