1) Here is a ball bouncing toward Kamili.
a: How can she stop it?
b: How can she change the ball's direction?

2) Which forcemeter is measuring the greatest force?

3) Alex tested the force needed to pull his skateboard over different surfaces. Here are the results.

a: Which surface was the hardest to pull the skateboard on?
b: Which surface was the easiest to pull the skateboard on?
4) Which surface creates the most friction with a skateboard:
• wood
• grass 
• stone?
Explain your answer.