An unmanned rocket is launched upward from a platform with high velocity. What would most likely happen if the rocket’s engine was suddenly turned off?

• A. It would stop moving.

• B. It would continue upward with the same speed.

• C. It would slow down and rotate within Earth’s orbit.

• D. It would slow down and begin falling back to Earth.

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This diagram shows forces acting on a box.

Which statement best describes the forces?

• A. The forces are balanced, and the net force on the object will be 0.

• B. The forces are unbalanced, and the net force on the object will be 0.

• C. The forces are balanced, and the net force on the object will be 400 units of force.

• D. The forces are unbalanced, and the net force on the object will be 400 units of force.

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Which statement best compares unbalanced forces to balanced forces?

• Unbalanced forces are equal in strength, while balanced forces are unequal in strength.

• Unbalanced forces are unequal in strength, while balanced forces are equal in strength.

• Unbalanced forces are unable to change the speed of an object, while balanced forces change the speed of an object.

• Unbalanced forces are unable to change the direction of an object, while balanced forces change the direction of an object.

Two forces are acting on an object but there is no motion. Which term describes the forces?

• balanced

• efficient

• inert

• unbalanced

A stationary object experiences two forces, as shown in the diagram below. How will these forces affect the object?

• The object will accelerate because the forces are balanced.

• The object will accelerate because the forces are unbalanced.

• The object will remain stationary because the forces are balanced.

• The object will remain stationary because the forces are unbalanced.

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NGSS.MS-PS2-2

One person is pushing a cart with a force of 300 units to the right. Another person is pushing on the same cart with a force of 450 units to the left. What is the unbalanced net force acting on the cart?

• 150 units to the left

• 150 units to the right

• 750 units to the right

• 750 units to the left

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According to Sir Isaac Newton, what will happen to an object that is already in motion when acted upon by balanced forces?

• It will stay in motion

• It will eventually stop

• It will immediately stop

• It will accelerate indefinitely

Which best describes the relationship between forces and motion?

• Forces change motion.

• Motion balanced forces.

• Forces cause no change in motion.

• Motion affects gravity, which changes forces.

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Jill and George both push on the same cart with 20 units of force, but in opposite directions. What will happen to the cart?

• The cart will not move.

• The cart will roll toward Jill.

• The cart will roll toward George.

• The cart will turn perpendicular to both George and Jill.

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A roller coaster on top of a hill begins to roll down the hill. How will forces most likely act on the roller coaster?

• Air resistance will pull the roller coaster down the hill and cause the speed of the roller coaster to increase.

• Gravity will pull the roller coaster toward the ground and cause the speed of the roller coaster to decrease.

• Gravity will pull the roller coaster toward the ground and cause the speed of the roller coaster to increase.

• Air resistance will push against the roller coaster as it moves down the hill, causing its speed to increase.

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