UNIT 4 Forces and motion Review Game

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 speeding up in certain intervals while decreasing in others.
• The train is moving at a constant speed.
• The train is slowing down.

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There are four forces acting on the box: A spring pulls with a force of 40 N. The force of gravity acts downward; and the force of the table is pushing up on the box. What MUST be true of the frictional force if the box moves across the table?

• It is less than the effort force.
• It is equal to the force of gravity.
• It is equal to the effort force.
• It is more than the effort force.

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When pushing a child on a swing, you must give them a push periodically to keep them moving. This seems to go against the law of inertia and the conservation of energy. Explain why the child need a push periodically to keep moving.

• Friction provides an outside force slowing the swing down.
• Energy is lost over time slowing down the swing.
• A wind must have been blowing in the opposite direction.
• All objects will naturally come to rest over time.

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Based on the graph, during what time period is the race horse moving at the FASTEST speed?

• 0 to 4 seconds
• 2 to 4 seconds
• 4 to 6 seconds
• 0 to 1 seconds

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NGSS.MS-PS3-1

Which car is accelerating?

• a car that travels in straight line at a constant speed
• a car that is unmoving
• a car that is set to a constant speed of 60 miles per hour
• a car that rounds a curve at a constant speed

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NGSS.MS-PS2-2

A train engineer started the train from a standstill and sped up to 5 meters per second, she then rounded a corner at a constant speed. She then sped the train up to 10 meters per second on the next straightaway. Next, the train chugged around another bend at 10 m/sec, and then its speed slowed to 5 meters per second after coming out of the bend. Finally, the train reached the station, and the engineer applied the brakes and brought the engine to a stop. How many times did the train accelerate?

• 6
• 2
• 5
• 4

The graph represents the acceleration of two cars, Accel 1 and Accel 2, during a road trip. Which statement BEST describes the differences between the two cars' acceleration during the trip?

• Accel 1 has a constant rate of acceleration; Accel 2 accelerates at different rates during the trip.

• Accel 1 accelerates throughout the entire trip; Accel 2 does not accelerate during the trip.

• Accel 1 accelerates for the first two-thirds of the trip; Accel 2 has a constant rate of acceleration.

• Accel 1 rapidly accelerates and then stops; Accel 2 maintains a constant velocity during the trip.

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?

• height of men
• age of men
• condition of the ground
• total mass of the team

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NGSS.MS-PS2-1

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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?

• 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.
• No really, They did stop but that was only when they reached the campsite at distance equals 0
• No. They continued moving but their speed was varied.

Why does an object in motion stay in motion unless acted on by an unbalanced force?

• because forces are what stop and start motion
• because motion, once begun, continues to accelerate
• because motion is the inherent state of all matter
• because balanced forces do not exist in nature