TCI Unit 2 Lesson 3: Review

Which of these is an example of back-and-forth motion?

• a bowling ball rolling down a lane

• a pinwheel spinning around

• a child moving on a swing

• a top turning

If you kick a soccer ball forward, what kind of motion will it move with and why?

• Motion in a line, because gravity pulls it down.

• Circular motion, because gravity pushes it back.

• Back-and-forth motion, because the ball rolls as it moves.

• Motion in a line, because the ball moves in one direction away from your foot.

To predict how an object will move means to use what you know to:

• change the direction of the object.

• change the position of the object.

• learn about the object from what happened in the past.

• tell what might happen to the object in the future.

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You and your friend spin a jump rope in a circle. Predict what will happen if you keep spinning the jump rope.

• The rope will stop moving.

• The rope will keep moving in a circle.

• The rope will stop moving in a pattern.

• The rope will change directions.

Look at the picture. Describe the pattern of motion of the jump rope as the girl plays jump rope.

• Back and forth

• Circular

• Straight line

• Curved line

In the picture, are the forces on the girl balanced or unbalanced as she plays jump rope? How can you tell?

• Balanced; the girl is standing still

• Balanced; the girl is moving in a circle

• Unbalanced: the girl's motion keeps changing

• Unbalanced: the girl is standing still

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In the picture, what force causes the girl to move upward?

• Gravity

• The jump rope

• The girl pushing with her legs

• The girls swinging the rope

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In the picture, what force causes the girl to move downward?

• Gravity

• The jump rope

• The girl pushing with her legs

• The girls swinging the rope

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Emi and Ana go to a fair and go on several rides shown here. The arrows show the direction of movement. Which pictures show rides that can move in a forward motion? Use evidence in the photos.

• Pictures 1 and 2

• Pictures 2 and 3

• Pictures 1 and 3

• Pictures 2 and 4

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Ellie’s mother receives a clock as a present, and Ellie helps her hang it in the living room. When the clock is turned on, Ellie’s mother says it will move in different ways.

Which part or parts of the grandfather clock should Ellie expect to move in a back-and-forth motion?

• A only

• C only

• A and B

• B and C

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