Science Cumulative : Digital Learning Week 6

Mrs. Lemons's class makes a ramp. Her students release a toy car and let it roll down the ramp. They measure how long it takes the car to travel 1 m past the end of the ramp. Which of the following reasons explains why the students need to have several trials of releasing the car before they analyze the results?

• They may want to move the ramp each time.

• The carpet on the floor may have slowed down the car.

• They may want to try pushing the car instead of releasing it.

• Someone could have been distracted and might not have stopped the stopwatch right away.

Scientists always develop a plan when they try to learn something about our natural world. Which sequence correctly shows the steps scientists follow in their plans?

• make observations; develop an idea; obtain evidence; suggest an explanation

• obtain evidence;make observations; develop an idea; suggest an explanation

• develop an idea; make observations; obtain evidence; suggest an explanation

• develop an idea;make observations; suggest an explanation; obtain evidence;

Gabby 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 Gabby observe at the pool on Sunday than on Thursday?

• 25

• 30

• 75

• 100

Imagine you bring a negatively charged balloon near a wall. What happens within the wall?

• Protons in the wall move toward the balloon.

• Electrons in the wall move toward the balloon.

• Protons in the wall move away from the balloon.

• Electrons in the wall move away from the balloon.

Joe builds an electric circuit out of several pieces of wire, a light bulb, and a battery. Now she wants to add a switch to the circuit. Which of the following would be BEST to use for a switch?

• a cotton string

• a metal paper clip

• a plastic spoon

• a wooden stick

Matter can exist as a solid, liquid, or gas. Which change is MOST LIKELY to cause matter to change from one state to another?

• a change in color

• a change in volume

• a change in mass

• a change in temperature

An electron has a negative charge. What is the charge of a particle that is attracted to the electron?

• positive

• negative

• neutral

• repulsive

Which question can't easily be answered by experiment?

• Do plants grow better in direct sunlight or shade?

• Do dogs run faster than cats?

• How do stars form?

• Do dark colored cars absorb more heat from sunlight than light colored cars?

Which tool is best for measuring length?

• meter stick

• measuring cup

• spring scale

• thermometer

What do engineers need to do in order to test a design?

• brainstorm ideas

• build a prototype

• identify a problem

• draw conclusions