Will the velocity of the book change as it moves across the surface with NO friction? Explain your answer.

Will the velocity of the book change as it moves across the surface WITH friction? Explain your answer.

Imagine you push a book across an incredibly slippery surface. It slides right across because there is NO friction. Next, you push the same book across a rougher surface that exerts friction.

How does the velocity of the book change as it moves across the surface WITH friction? Explain your answer using the direction of force.

What will you change (the independent variable) in each test? ________________________

What will you observe (the dependent variable) as a result of that change? __________________

Complete the following data table by completing 6 different tests with the spring launcher. After each test record your data in the table below.

Which jar lid surface allowed for the greatest distance of travel? (check one)

How does friction impact the distance an object is able to travel?

CFS:

• Accurately identifies changes in the dependent variable by analyzing the movement of objects

• Accurately describes the relationship between distance traveled and friction forces

Why do you think the jar lid slowed down and came to a stop rather than changing direction?

CFS:

• Accurately identifies changes in the dependent variable by analyzing the movement of objects

• Accurately describes the relationship between distance traveled and friction forces

Compare the speed of each book as they slide off the table. If each receives the same applied force, which is likely to fall first? Explain.

CFS:

• Accurately identifies changes in the dependent variable by analyzing the movement of objects

• Accurately describes the relationship between distance traveled and friction forces

What direction of force was applied to the book allowing it to move?

What direction of force would need to be applied for it to go off the table to the left after it is in motion?

Describe how friction force can be used to stop the book before it falls off the table without anyone touching it.

CFS:

• Accurately identifies changes in the dependent variable by analyzing the movement of objects

• Accurately describes the relationship between distance traveled and friction forces