Force and Motion Quiz 3

A push or a pull

• magnetism

• speed

• force

• friction

Some students attach a balloon to a straw and then they tape the straw to the top of a toy car. The students inflate the balloon and release the car. The car travels 40 centimeters across the floor. What should the students do to determine whether the force of the air from a balloon is enough to push the car 40 centimeters across the the same floor in repeated trials?

• Test the car several times using an identical balloon filled with different amounts of air.

• Test the car several times using different-sized balloons filled with the same amount of air.

• Test the car several times using an identical balloon filled with the same amount of air.

• Test the car several times using different-sized balloons with different amounts of air.

A student uses a spring scale to pull a 50-gram block horizontally across a wood desk. Then the student pulls the block the same distance across surfaces of carpet, sandpaper, and glass. Which question is this investigation most likely designed to answer?

• How do blocks of different sizes react to force?

• How do different surfaces affect the amount of force needed to move a block?

• How do blocks affect spring scales?

• How does the mass of a block change when it is pulled across a desk?

A student observes that the craters on the moon are different sizes. The student designs an experiment to study the formation of craters. The materials for the experiment are marbles and a pan of flour. The student makes a hypothesis that the size of the craters made on the surface of the flour will depend on the height from which the marble is dropped. Some of the steps in the student's experiment are described. Which of these is most likely Step 3 in the student's experiment?

• Drop the same marble from different heights into the pan of flour

• Drop marbles of different masses from the same height into the pan of flour

• Drop marbles of different sizes from different heights into the pan of flour

• Drop a single marble one at a time into the pan of flour

A student designs an experiment to test the force of spring using a spring launcher and four spheres with the same diameter but with different masses. What other piece of equipment would be most useful for this experiment?

• A graduated cylinder to measure a volume of each sphere before the sphere is launched.

• A beaker to collect the spheres after they have been launched

• A stopwatch to measure how long it takes to load each sphere on the spring

• A meter stick to measure the height each sphere reaches after the sphere is launched

A student designs an experiment to test the effect of the width of a piece of elastic's ability to stretch. The student selects four pieces of elastic with different widths but the same length. The student then attaches blocks with different masses to the pieces of elastic. The results of the student's experiment are shown above. What should the student do to improve this experiment?

• Use blocks of equal mass on the four pieces of elastic

• Use blocks with enough mass to cause the four pieces of elastic to break

• Use more than four pieces of elastic and four blocks

• Use four pieces of elastic with different lengths but the same width

Which of the following statements regarding a simple experimental investigation is correct?

• A. Everything remains constant in a simple experimental investigation.

• B. One variable is tested in a simple experimental investigation.

• C. Two variables can be tested in a simple experimental investigation.

• D. Nothing remains constant in a simple experimental investigation.

Which of the procedures below would provide the most reliable data?

• A. Pull each type of shoe once and record the results.

• B. Pull each type of shoe twice and record the results of each trial.

• C. Pull each shoe five times and record the results of each trial.

• D. All of the procedures have the same reliability.

Students are designing an experimental investigation where they determine how the height of a ramp affects the speed of a toy car by measuring how long it takes for the toy car to travel down different-sized wood ramps. What other scientific tool do the students need in order to complete this experimental investigation?

• A. Hand lens

• B. Metric ruler

• C. Timing device (stop watch)

• D. Spring scale

Based on the picture above, what should be done to improve this experimental investigation?

• A. The ramps should all be the same height.

• B. The ramps should be made of different materials.

• C. The same car should be used on both ramps.

• D. The experimental design is correct the way it is.