Gabrielle counts the number of people who visit the community pool each day for 1 week. She displays her data using a bar graph.
How many more people did Gabrielle observe at the pool on Sunday than on Thursday?
Observations are made using our five senses. We can then use those observations to draw conclusions. Which of the following is an example of a conclusion?
- The object is flat.
- The flower smells like mint.
- Crickets chirp to attract mates.
- The food is both sweet and salty.
Crickets chirp to attract mates.
Scientists are not the only ones who gather information. For example, historians gather information to describe what has happened in the past. However, scientists gather infromation differently than others. Which way of gathering information do only scientists use?
Why do scientists repeat their experiments?
To make sure that the information they collect is reliable.
Asa watches his mom rub soap on her finger to help her get a ring unstuck. He thinks that soap must reduce friction. He designs an investigation to test his theory. He pulls a weight across a board and records the force with a spring scale. he then puts soap on the board and pulls the weight again. Which of the following variables is Asa measuing?
- The speed with which the weight is pulled
- The amount of weight being pulled
- The force needed to pull the weight
- The type of surface the weight is being pulled across
The force needed to pull the weight
Gabriela is learning how to accurately read a thermometer. She places the following thermometer in the sun for 1 hour.
What temperature does Gabriella read on the thermometer?
Lia measured the volume of a liquid using a graduated cylinder. The following illustration shows three position from which she could take a reading.
From which position should Lia observe the cylinder to get an accurate reading?
Four students threw darts at the center of a dart board. Which target shows the most accurate results?
The answers is.....
Different systems for making measurements use different units. Which system of measurement is generally used by scientists?
Joshua has been growing plants that receive 1/2 cup of water two times per week. Now he wants to see what happens to the plants when the amount of water is reduced, as shown in the chart.
Which plant is the control?
1/2 cup two times per week
Scientists want to determine if walls that are painted a certain color will raise a person's blood pressure. They plan to set up four rooms. Which variable should change in each room?
- The color used
- The type of room used
- The instruments used to test the blodd pressure
- The amount of time the person spends in the room
The color used
Sandy observes the phases of the moon during a two-week period. She sketches and labels the phases and shares her drawing with the class. Which statement best describes Sandy's investigation.
- It involves modeling
- It involves experimentation
- It involves repeated observation
- It involves both experimentation and repeated observations
It involves repeated observations.
Scientists include controls in their experiments. Why is a control important?
It helps scientists compare their results to a standard.
A teacher writes the following note on a student's experimental design; "You did not identify and control variables." Why is it important to identify and control variables?
Because a scientist must know which variable causes change.
Michael rides a bike made by Company A. Luis rides a bike made by Company B. How can Michael and Luis determine in a scientific way whose bike has tires that last longer?
Use a machine to test the bikes in the same way for 25 days, then compare the tires.
A doctor says that drinking two glasses of milk in the morning will give students more energy. Which of the following would be good scientific evidence for or against the doctor's claim.
- a brochure from the doctor stating the benefits of milk
- data from scientific investigation about drinking milk in the morning
- a TV advertisement that drinking milk in the morning gives people plenty of energy
- statements from five people about how drinking milk in the morning gives them energy
Data from scientific investigation about drinking milk in the morning.
Whan Andrew conducts an investigation, he repeats the investigation several times. Why does Andrew do this?
To get consistent results.
Sameh's friends wanted to see a different movie than he did. To get his friends to see the movie he wanted, Sameh told them about the exciting preview he saw. In scientific terms, which of the following best describes what Sameh was doing?
- giving his opinion
- stating a conclusion
- surveying his friends
Giving his opinion
Study the following pictures of common classroom objects.
Which objects would be classified together?
1, 3, 4
Pencil, Pen and Chalk
Sometimes, the results of an investigation are not what was expected. When this happens, what should a scientist do?
Plan another investiagation to test the results of the first one.