Unit 6: Forces, Motion, and Laws Review 1

You are sitting in a car that isn't moving; suddenly, the car quickly accelerates. Your body seems to be pushed back against the seat. Which word best explains why your body seemed to be pushed backward against the seat?

• newton

• vector

• inertia

• gravity

John and Caroline go out for a walk one day. This graph represents their distance from home. Which statement accurately describes their walk?

• They walked quickly, then they were still, then they walked slowly.

• They walked forward fast, then they were still, then they walked backward slowly.

• They walked in one direction, then they were still, then they walked in the opposite direction.

• They walked faster and faster until they walked at a constant rate, then they walked slower and slower.

John and Caroline go out for a drive one day. This graph represents the distance they traveled over time. During what part of their drive are they not moving?

• From 0 to 0.75 hours

• From 1.25 to 2.0 hours

• From 0.75 to 1.25 hours

• They are moving the entire time.

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NGSS.MS-PS3-1

During summer break, Jamie's family went camping in the mountains. There were no roads to their camp, 8 miles away, and it took them about 4.5 hours to reach the campsite on foot. Did Jamie's family stop to rest during the trip? How can you tell from the data?

• No. They continued moving but their speed varied.

• Yes. After 1.5 hours, there is no change in position for 30 minutes.

• No. They continued moving, although they also slowed down continuously during the trip.

• Not really. They did stop, but that was only when they reached the campsite at distance equals 0.

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Consider this line graph that represents speed in centimeters/second. The X-axis is labeled in seconds; the Y-axis is labeled in centimeters. Imagine that the moving object stops after 2.5 seconds and stays stopped for 0.5 seconds. What would the line for that time interval look like on this graph?

• 
• 
• 
• 

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Brad and Erin decide to have a tug of war contest. Erin pulls the rope with all her might and so does Brad. Sadly, Brad only pulls with half the force that Erin pulls with. Sarah is watching and waiting for her turn. Since the forces are unbalanced the rope will move towards Erin. Using Newton's first law of motion as a model, explain how Brad could keep from losing the tug of war.

• Ask Erin to let go of the rope.

• Make the rope longer so Brad can get a better grip.

• Let Sarah, who pulls just as hard as Brad, team up with him to pull the rope together.

• Let Sarah, who pulls just as hard as Brad, team up with Erin to pull the rope together.

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NGSS.MS-PS2-2

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

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

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

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

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

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According to the diagram, the block should be moving in which direction?

• The block should not move at all.

• The block should move to the left.

• The block should move to the right.

• There is no way to tell which way the block should move.

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NGSS.MS-PS2-1

A 10-kg object is pushed across a rough surface. It begins at rest and accelerates to a speed of 4 m/s in a distance of 5m. Which fact(s) support the conclusion that the object experiences an unbalanced force?

• The rough surface has friction.

• The object has a mass of 10-kg.

• The object accelerates across the surface.

• The object has a force applied to it and covers a distance.

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An empty truck and a fully loaded truck are next to each other at a traffic light. When the light turns green, the lighter truck increases speed more quickly. Which of these best explains this situation?

• Newton's first law

• Newton's second law

• Newton's third law

• Conservation of momentum

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