Science 5.6D

A student designs an experiment to test how the mass of a toy car will affect the distance it will travel after being rolled down a ramp. The student selects two cars with different masses and two ramps with different heights. What should the student do to improve this experiment?

• Use ramps that are longer

• Use ramps that are the same height

• Use two different cars with the same mass

• Use more than two different cars and ramps

A student designs an experiment to test how force affects the motion of an object. The materials for the experiment are a catapult built from a tissue box that launches marshmallows. The student makes the hypothesis that the distance a marshmallow will travel depends on how far down the catapult is pushed down before launching the marshmallow. Some of the steps in the student's experiment are described below.

• Shoot different sized marshmallow from the same catapult position

• Shoot a single marshmallow one time and measure the distance

• Shoot the same sized marshmallow from different catapult positions

The diagram shows a force and motion investigation. Students used the tools listed on the diagram to test how the amount of air in the balloon affects the distance the straw and balloon travel. If the students change the amount of air in the balloon during this investigation, what do you predict will happen?

• The color of the balloon will affect the distance traveled.

• The distance the balloon travels will vary depending on the amount of air.

• The distance traveled cannot be tested with this investigation.

• The distance the balloon travels will not vary.

Three students used spring scales to measure the force needed to pull three blocks made of different materials up a ramp. Students recorded the force used to pull each block in the chart below. Which of the following is the best explanation of why the blocks required different amounts of force?

• The blocks all have different masses.

• The blocks are all made of the same material.

• The ramp's surface is not even.

• Friction between the blocks and the ramp does not exist.

A science class designed an investigation to test the effect of force on an object. They will be using a basketball, a meter stick, and three materials with different textures. This investigation can be used to determine how the --

• distance that a ball rolls on a material affects the height that the ball bounces.

• texture of a material affects the height that a ball bounces.

• height that a ball bounces affects the material the ball is made of.

• mass of a bouncing ball affects the texture of a material.