Question 5: How does the surface affect the speed of a moving object? This is a question that you might consider with second grade students when they are investigating force. I want you to design a simple investigation using the materials listed to answer this question.

Materials:

• Cardboard (to make a ramp)
• Plain book (to make a ramp)
• 2 balls (marble balls)
• Ruler

Questions:

My simple investigation using the balls, ruler, and a simple ramp to answer the question: How does the surface affect the speed of a moving ball?

Try out your simple investigation and write the data you collect here.

Using the design for a similar simple investigation to answer: How does the surface affect the speed of the moving cart?

Try out your simple investigation and write the data you collect here.

Claim: How does the surface affect the speed of a moving object?

Evidence: Describe the evidence you have from both investigations to support your claim.

Reasoning: Why does the evidence support your claim based on what you know? Think about using the idea of friction.