Choose between "green path" and  "blue path". Question: Mary takes her skateboard on a green path and her skateboard moves easily and quickly. Then Mary skates on a blue path and has a hard time moving. The green path has (A) more friction (B) less friction.
blue path

Choose between "tree" and  "paper". Question: Marty writes a letter on a sheet of paper. Later he tries using the pen to draw something on a tree outside. The tip of the pen produces more heat when he uses it against the tree. This is because the _____ offers less resistance. (A) paper (B) tree
tree

Choose between "whetstone" and  "chunk of rubber". Question: When Linda needed to sharpen her knife, she did it by rubbing her knife over two different surfaces. She tried the whetstone and noticed that it was bumpier than the chunk of rubber. She realizes that the sharpening surface that gets hotter to the touch when a knife is rubbed against it is the (A) whetstone (B) chunk of rubber
whetstone