Observation Gathering of information using your five senses

Observation • Gathering of information using your five senses • Helps you to define the problem you want to solve

The Problem • Testable question that is written in question form

Examples of Testable Problems • Which flavor of gum lasts the longest? • Which brand of laundry detergent is best at getting rid of stains? • Which brand of toilet paper is the strongest? • What is the effect of cigarette smoke on household plants?

Testable Problems • Work with the person next to you and discuss one or two testable problems…be able to explain how it can be “tested”

Practice with Hypotheses • What is the effect of cigarette smoke on household plants? If I test to see how cigarette smoke affects household plants, then I will find that … OR If I put plants in an environment with lots of cigarette smoke, I will find that …

Practice with Hypotheses • Which brand of laundry detergent is best at getting rid of stains? If I test a variety of laundry detergent to see which one gets rid of stains the best, then I will find that…

Group Work-Write Hypotheses • Which brand of soap gets rid of germs the best? • What is the best amount of sunlight and water for growing violets? • Which brand of sneakers will allow you to jump the highest? • How are student grades affected by the amount of time spent viewing television?

Checks Lab- Possible Hypotheses • Marriage • Child born • Child sick (medical center) • AIDS • Summer camp for sick child • Death of child • Marriage counseling • Divorce and name change

Experiment • A step by step process that tests your hypothesis. • Uses variables • Independent variable: “I” change it; purposefully changed • Dependent variable: the variable that responds to the independent variable; changed when you change the independent variable; what you measure; your results • Control- is controlled and stays the same; also called constant

Variables in an Experiment

Independent Variable: • “I” change it • Manipulated variable • MIX

Dependent Variable • Depends on the independent variable • It is the Response • DRY

D R Y MIX

DO NOW • Students in science class wanted to find out if the temperature in the room had an effect on the amount of time the hamster slept during the day. • Give the… 1. Independent Variable 2. Dependent Variable 3. Hypothesis

Conclusion 1. Tells if hypothesis was correct or incorrect 2. Makes a statement to explain why hypothesis was correct/incorrect. 3. Uses data from the experiment as evidence to support the statement made in number 2 above.

Sling Shot Lab 1. 2. 3. 4. 5. Gather materials Place the slingshot at the “starting position”. Mark this with a piece of tape. Use the meter stick to determine the distances for rubber band pull back (2 cm, 3 cm, and 4 cm) Place the dice on the rubber band pull back to the first distance (2 cm). Release and observe the distance the dice travels. Measure and record in the data table. Repeat for remaining rubber band pull distances (3 cm and 4 cm).

Sling Shot Lab Materials: slingshot, dice, meter stick, masking tape Distance of pulled band. 2 cm 3 cm 4 cm Distance dice traveled.

Homework: • Use the data collected by your group to: • Make a line graph (remember to label) • Identify independent variable • Identify the dependent variable