CBA #2 Review

Why is it harder for the boy in Image B to get down the hill?

• Motion

• Friction

• Work

• Displacement

A student designs an experiment to test the force of a spring using a spring launcher and four spheres with the same diameter but with different masses. What question is being asked in this investigation?

• How does the mass of the ball affect the force needed?

• How does the diameter of the ball affect the force needed?

• How does the color of the ball affect the force needed?

• How does the height of launch affect the mass?

The diagrams show two trials of an experiment in which a spring scale was used to measure force. What is the difference between the two trials?

• The mass

• The surface of the table

• The angle of incline

• The type of book used

Students design an experiment to determine how much force is needed to move blocks of wood of different masses across a lab table. What is the question the students are trying to answer?

• How much force is needed to move the block?

• How does the mass affect the force needed?

• How does the surface affect the force needed?

• How does the type of wood affect the force needed?

Students design an experiment to determine how much force is needed to move blocks of wood of different masses across a lab table. What is the variable that should change this investigation?

• Spring Scale

• Surface of the table

• Mass of wood block

• Speed the block is moved

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 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

How does the light behave differently when it enters the prism?

• The ray of light becomes shorter when it strikes the glass.

• The ray of light straightens as it strikes the glass.

• The ray of light bends as it strikes the glass.

• The ray of light transforms to heat when it strikes the glass.

Light travels in waves. Which of the following statements about light waves is NOT true?

• They change direction when they are reflected or refracted.

• They travel in straight lines

• They can come from natural or artificial sources.

• They can travel through any substance.

Andres wants to determine if he can consistently hit a baseball out of the park when he swings the bat as hard as he can. What should Andres do to determine whether he can consistently hit a baseball out of the park?

• Hit different types of balls, many times, with varying amounts of force.

• Hit the same ball, a few times, with varying amounts of force.

• Hit the same ball, many times, with same amount of force.

• Hit different types of balls, a few times, with the same amount of force.