Force, Mass and Motion

The image above shows two opposite forces acting on a rolling cart, what can we say is true about the affect of the forces on the cart?

• It cannot be determined without knowing which man is stronger.

• It cannot be determined because one man is taller than the other.

• The forces are unbalanced, and net force on the cart moves it to the left.

• The forces are unbalanced, and net force on the cart moves it to the right.

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NGSS.MS-PS2-1

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Kimberly, Alex, and Fernando built small sailboats in science class. Their boats have the following weights: Kimberly: 150 grams Alex: 175 grams Fernando: 200 grams Think about how much force is needed to move each boat. Which correctly lists the boats in order from the most to least amount of force needed to move them?

• Fernando, Alex, Kimberly

• Alex, Kimberly, Fernando

• Kimberly, Alex, Fernando

• Kimberly, Fernando, Alex

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NGSS.MS-PS2-2

The diagram represents the movement of a train from left to right, with velocity v. Which statement is true?

• The train is speeding up.

• The train is slowing down.

• The train is moving at a constant speed.

• The train is speeding up in certain intervals while decreasing in others.

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Two people must have the same speed and velocity if...

• they are walking toward each other at 2 m/s.

• they are walking away from each other at 2 m/s.

• they are jogging side by side at 5 m/s.

• they are jogging to two different destinations.

The more massive an object, the (a)   affect a certain force will have on the object.

• less

• more

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NGSS.MS-PS2-2

Two platoons line up for a tug of war. If both platoons have the same number of participants on a team, what other factor is critical to either platoon's win?

• age of men

• height of men

• total mass of the team

• condition of the ground

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NGSS.MS-PS3-1

While studying balanced and unbalanced forces, Jose and Gina test what they have learned by Jose applying 10 Newtons of forces to one side of a box and Gina applying 8 Newtons of force to the other side of the box.

• The box does not move.

• The box moves toward Gina.

• The box moves toward Jose.

• The force crumples the box.

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Jawanda was playing with her new Superman bobble head. She noticed that after she pushed Superman's head it would vibrate, but after a while it would bobble less and then stop. Which of Newton's laws best explains why this happened?

• The first law - The head moves until a force stops it.

• The third law - The head is reacting to a action force.

• The first law - The head is in motion and it will remain in motion.

• The second law - The head was not pushed hard enough to keep the head moving.

During a race, four competitors of the same weight rode identical bicycles for 10 minutes. After eight minutes, which bicycle was moving with the greatest velocity?

• A

• B

• C

• D

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Which situation is the BEST example of inertia?

• An old lady uses a walker and is able to cross the street.

• A rocket thrusts its boosters and lifts off the launching pad.

• A rock is thrown vertically up in the air and it falls back to the earth.

• You go down a steep roller coaster and it feels like your stomach is going up into your throat.

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