Force and Motion
Julia made an observation of one of the balloons. When it was released, it hovered at the same height for three days. Why did the balloon stay at the same height?
The forces acting on the balloon were balanced.
Emma and Jaela were making hot chocolate for family movie night. They needed to make 6 cups, and they wanted to dissolve the chocolate in the milk as quickly as possible. They heated the milk and stirred large blocks of chocolate into the hot milk. What could Emma and Jaela have done to speed up the process of making hot chocolate?
They could have broken the chocolate blocks into small pieces.
How do you make your data more valid and reliable?
Repeat the trials the same way.
Erik’s brother, Weston, wanted to be pushed on the swings. Erik was pushing Weston and the swing was calmly moving back and forth. Weston asked Erik to push harder. What did Erik notice about the swing after pushing with more force?
Pushing with more force caused the swing to have more motion.
Karthekeya cut up pineapples, bananas, oranges and strawberries to make two bowls of fruit salad. Karthekeya left one bowl on the table and put the second bowl in the refrigerator. After 4 hours, Karthekeya observed the fruit on the table showed signs of starting to decompose, but the fruit in the refrigerator did not. What can explain Karthekeya’s observations?
The colder temperature in the refrigerator slowed down the process of decomposing.
Mr. Bowers wants to replicate your experiment. What does he need to do to be able to compare the data?
He needs to use the same procedures, materials and variables to be able to compare the data.
Mrs. Redman noticed that a shelf in the classroom was starting to fall. Adding another screw to the shelf kept it in place. What was Mrs. Redman doing by adding another screw to the shelf?
Mrs. Redman balanced the forces pushing the shelf up with the force of gravity pulling it down.
Sahasra did not follow the directions on the recipe and dropped the chocolate chips into the flour before it was time to add them. How can Sahasra separate the chocolate chips from the flour again?
She can use a wire mesh to separate the flour from the chocolate chips.
Abhivanth and Zorayz wondered what would happen if they used different brands of flour to make their cookies. They used the same recipe and procedure 5 more times, but changed the brand of flour. Did Abhivanth and Zorayz conduct an investigation or an experiment?
An experiment – they changed the brand of flour and kept everything else the same.
Sofia was engineering a paper airplane for a competition at school. The goal was to throw the plane and have it travel the farthest distance. Sofia practiced throwing the plane by pulling her arm back, then bringing it forward and releasing the plane. What forces act upon the plane during the competition?
Throwing the plane is a push. The air pushes up on the plane. Gravity pulls down on the plane.
Sam was creating a terrarium and gathered all the materials to go inside the covered dome. Sam collected gravel (small rocks), soil, seeds, and shells. Sam’s sister, Julia, wanted to make one too. Julia mixed all the materials together. Sam said, “Wait, we need to make layers of the materials. We need to separate them.” What is the best way that Sam could separate all the materials?
Sam could use a sieve to separate the shells, gravel, and seeds from the soil, then use forceps to separate the shells, gravel, and seeds.
Which statement is an observation?
A. Pollinators do not like the sunflower garden.
B. The sunflower garden probably had the highest number of pollinators.
C. More pollinators were observed in the vegetable garden than the cactus garden.
D. It’s okay that there was only 1 bat in the greenhouse, because the plants in the greenhouse do not need to be pollinated.
C. More pollinators were observed in the vegetable garden than the cactus garden.
Rohan was pulling David in their toy wagon. The wagon was easy to pull across the driveway. Their friend also wanted to play and climbed in the wagon with David. What change did Rohan notice when pulling the wagon with the same amount of force?
The wagon moved less because it had more mass.
Ishal mixed all the ingredients but observed that one of the materials did not dissolve when mixed with the water. What material is Ishal referring to?
A. salt
B. flour
C. Jello (sugar) powder
D. lemonade (sugar) mix
B. flour
Sahasra and Julia were investigating if adding sugar to water affected the time it took a piece of ice to melt in the water. What is the purpose of collecting data on water without sugar?
The data provides a control group, so they have evidence to support the statement that the change was due to the sugar being added.