Forces & Motion

Read each question. Circle the answer or write it on the lines.

1. 1.

   Jen drags a sled up a snowy hill by its rope. Is she using a push or a pull?

   (1 pt)

   ○ push○ pull
2. 2.

   A soccer ball rolls toward Zoe. She kicks it back the way it came. What did her kick do to the ball's motion?

   (1 pt)
3. 3.

   Which one can a force NOT do to an object?

   (1 pt)

   ○ make it speed up○ make it slow down○ change its direction○ change it into a different object
4. 4.

   A bird feeder hangs still from a branch on a rope. The rope pulls up on the feeder. What force pulls the feeder down? Are the forces on the feeder balanced or unbalanced? How do you know?

   (3 pts)
5. 5.

   Theo tosses a ball straight up. It slows down, stops for a moment and falls back to his hand. What force pulls it back, and which way does that force pull?

   (2 pts)
6. 6.

   A box sits still on the floor. Mia pushes it to the right, and Sam pushes it to the left, but Mia pushes harder. a) Which way does the box move? b) The next day, the box is sitting still again. Mia and Sam push on it from opposite sides, equally hard. Does the box move? Why?

   (2 pts)

Read about Kayla's test. Use the table to answer questions 7 to 10.

1. 7.

   Rank the surfaces from LEAST friction to MOST friction.

   (2 pts)
2. 8.

   In Kayla's test, what is the one thing she changed? Name one thing she kept the same.

   (2 pts)
3. 9.

   Kayla says, "Smooth surfaces have less friction than bumpy ones." Do her results support her claim? Claim: ____ Evidence: ____ Reasoning: ____

   (6 pts)
4. 10.

   Why do people sprinkle sand on an icy sidewalk?

   (2 pts)

Think about forces that can act without touching. Use the table for question 14.

1. 11.

   Two ring magnets are slid onto a pencil. The top magnet floats above the bottom one without touching it. Which poles are facing each other? How do you know?

   (2 pts)
2. 12.

   Which object will a magnet attract?

   (1 pt)

   ○ aluminum foil○ a steel screw○ a plastic spoon○ a wool sock
3. 13.

   Write C for a contact force or N for a non-contact force. ___ a magnet pulls a nail across a small gap ___ a bat hits a baseball ___ gravity pulls a falling leaf down ___ a rubbed plastic comb lifts bits of paper ___ your hand pushes a door open

   (2 pts)
4. 14.

   Ana used the magnet in the table. What pattern do you see? Predict: with 8 layers, will the magnet hold more clips or fewer clips than with 6 layers?

   (3 pts)
5. 15.

   Jae rubs a balloon on his hair. It picks up tissue bits from 1 inch away but not from 6 inches away. Write one cause-and-effect question he could test next.

   (2 pts)
6. 16.

   A magnet is held above a paper clip on a table. The clip jumps up and sticks to the magnet. Name the force pulling the clip up and the force pulling it down. Which force was stronger? How do you know?

   (3 pts)

Use what you see to predict what will happen next. Use the table for questions 17 and 18.

1. 17.

   Lin lets a marble go near the rim of a big bowl. It rolls back and forth. The table shows how high it rolled up the side each time. Predict how high it will roll on Roll 5.

   (1 pt)
2. 18.

   If the marble keeps rolling, what will it do in the end? Use the pattern to explain.

   (2 pts)
3. 19.

   Kai's pendulum has a string 40 cm long. He changes to a string 15 cm long. Will it make more swings or fewer swings in 30 seconds? Why?

   (2 pts)
4. 20.

   Ana and Ben ride a see-saw. Ana's end is down right now. Where is Ben's end? What happens next when Ana pushes off the ground?

   (2 pts)