Motion Pretest

A group of six people are on a boat.  3 people are in the front and 3 people are in the back.  The front of the boat is sinking lower than the back of the boat.  Which best explains why the front of the boat is sinking lower?

• There are heavier items in the back of the boat than in the front of the boat.
• The pressure of the water is greater against the front of the boat.
• The people in the front of the boat are closer together.
• The people in the front of the boat are heavier.

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If a small rock and a large rock are both thrown at a wall at exactly the same speed, which rock would most likely cause more damage to the wall?

• The large rock would cause more damage because the force would be spread out on a larger area.
• The large rock would cause more damage because it has a greater mass, making the momentum greater.
• The small rock would cause more damage because it has a smaller mass, making the momentum greater.
• The small rock would cause more damage because all of the force would be concentrated on one small area.

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Two dogs are pulling on a toy in opposite directions. Which could cause the toy to move in a specific direction?

• if there is no friction acting on the toy
• if there is no gravity acting on the toy  
• if the dogs keep pulling with the same amount of force
• if one dog begins pulling with a greater amount of force

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Which best explains how an object’s motion changes when additional force is applied?

• As force increases, acceleration increases.
• As force increases, acceleration decreases.
• As force increases, the object’s mass changes.
• As force increases, the object’s direction changes.

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NGSS.MS-PS2-2

James and Roy compare the motion of two balls by rolling them across the floor and recording the time it takes them to travel the same distance. Ball X travels the distance in 15 seconds. Ball Y travels the distance in 11 seconds. Which best compares the motion of the two balls?

• Ball X travels faster than Ball Y.
• Ball Y travels faster than Ball X.  
• Both balls travel at the same speed.
• Both balls travel at a constant speed.  

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Which will slow an object in motion?  

• Speed
• Friction
• Gravity
• Momentum

Which must happen for a moving car to change direction?  

• The car must slow down.
• Gravity must act on the car.
• The mass of the car must change.
• Another force must act on the car.

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NGSS.MS-PS2-2

How long will it take a car that is moving at 60 miles per hour to travel 120 miles? (speed = distance ÷ time)  

• 1 hour
• 2 hours
• 3 hours
• 6 hours

Team 1 and Team 2 each have five people who are pulling with equal force on opposite ends of a rope. Which will most likely happen if Team 1 stops pulling on the rope?

• Team 1 will pull the rope closer to their side.
• Team 2 will pull the rope closer to their side.
• The rope will fall to the ground on both sides.  
• The rope will continue to be pulled in both directions.

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NGSS.MS-PS2-2

Which will most likely increase the speed of an object?

• applying a faster force
• applying a slower force
• applying a weeker force
• applying a stonger force

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NGSS.MS-PS2-2