Unit 7: Force and Motion

If you are bouncing a ball, how does gravity interact with the ball?

• Gravity pulls the ball toward the center of Earth.

• Gravity causes the friction on the ball to disappear.

• Gravity pushes the ball away from your hands.

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

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Landon pulls on the rope, but Dylan pulls in the opposite direction. The forces are not balanced and the box moves forward to the left. Which of these will increase the forward speed of the box?

• Removing all forces

• Balancing the applied forces

• Adding more mass to the box

• Increasing Landon's pulling force

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Ms. Radulski is pushing a box of books up a ramp. What can she do so that it will take less force to push the box?

• Tape the box shut

• Do not use the ramp

• Put more books in the box

• Take some books out of the box

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NGSS.MS-PS2-2

A group of students wanted to test how far five different balls would travel with a given force. They placed a golf ball, a tennis ball, a baseball, a soccer ball, and a bowling ball on the ground behind a start line. The students pushed each ball with the same amount of force. The bowling ball traveled the shortest distance, why?

• The bowling ball has more friction than the other balls.

• The bowling ball has less friction than the other balls.

• The bowling ball has more mass than the other balls.

• The bowling ball has less mass than the other balls.

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Miranda & Juliana are playing tug of war. The rope is staying in the same position. Which of these best explains why the rope does not move?

• The two forces are not equal.

• The two forces are equal and opposite.

• The two forces act in opposite directions.

• Two forces cannot act on the rope at the same time.

Ms. Donald and Ms. Radulski are pushing a large box full of textbooks across the room. The box does not move. Ms. Sanchez comes in to help and the box begins to move. Based upon this

information, what conclusion can be drawn?

• The forces acting on the box became unbalanced when the third person started pushing.

• The box had a mass less than the mass of the first person who tried to push it.

• The only force acting on the box is the push applied by the people.

• When the third person started to push, the mass of the box decreased.

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Esteban was doing an experiment to answer the question “How does the distance a toy car travels change when the mass of

the car increases?”. What is the control group in this experiment?

• The distance the first car traveled

• The car with 30 g of mass added

• The car with 0 g of mass added

• The car that traveled 0 m

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NGSS.MS-PS2-2

In an experiment, you are rolling a car down a ramp. The ramps are made of 3 different materials: sandpaper, brick, and glass. Which ramp would have the least amount of friction between the car?

• glass

• sandpaper

• brick

• they all have the same amount of friction