What should happen to magnets if two unlike poles are brought together?

• They will repel each other.

• They will not affect each other.

• They will make an electric current.

• They will be attracted to each other.

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Samantha drops a ball and it falls to the ground. What does this illustrate about gravity?

• Gravity pulls the ball toward the center of Earth.

• Gravity causes the friction on the ball to disappear.

• Gravity pushes the ball away from Suzette’s hands.

• Gravity causes the mass of the ball to decrease as it falls.

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Ella pushes a plastic toy car to set it in motion. Which force is NOT acting on the car?

• pulling force from gravity

• pushing force from her hand

• magnetic force from the north pole

• friction between the wheels and the surface

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The jet engines of a moving plane exert a force to make the plane travel forward at a constant speed. Which of these changes to the jet is likely to happen if the engines exert a greater force?

• increase in weight

• balance of forces

• decrease in braking distance

• increase in speed

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Ms. Jackson comes to an intersection and the light is green. She turns right without increasing or decreasing her speed. Which of these statements is true?

• The forces on the car are balanced because its speed does not change.

• The forces on the car are balanced because its mass does not change.

• The forces on the car are unbalanced because the amount of friction increases.

• The forces on the car are unbalanced because the direction of motion changes.

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Which box will require the most force to move?

• 
• 
• 
• 

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When this boy runs, his changing position is due to mechanical energy. Which of these also involves a change due to mechanical energy?

• water falling over a cliff

• rock sitting on top of a hill

• light coming from a desk lamp

• batteries powering a calculator

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It's a sunny day. Bonita looks through the classroom window and sees a bicycle passing on the street. What change to the bicycle did she observe, and what form of energy caused it?

• Its temperature changed because of heat energy

• Its position changed because of mechanical energy.

• Its color changed because of chemical energy.

• Its loudness changed because of sound energy.

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Shen fills a beaker with room-temperature water and then adds an ice cube. Which of the following is true of the liquid water after Shen adds the ice cube to it?

• It gains heat energy.

• It loses heat energy.

• Its heat energy does not change.

• Its heat energy increases and then decreases.

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Valerie rubbed a balloon on her hair and the balloon is now electrically charged. What will be repelled by the balloon?

• A wall that has no charge

• Another balloon that has no charge

• A person’s hair that has the same charge.

• Another balloon that has an opposite charge.

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