Mechanical Energy*

An amusement park engineer noticed that the roller coaster cart did not make it to the end of the track. He checks and determined that it was not a friction issue with the cart and track. Explain what he needs to do to help the cart reach the end of the track.

• Decrease the distance between the first and second hill to build more potential energy.

• Add another hill towards the end of the roller coaster to increase the amount of kinetic energy.

• Increase the height of the first hill to increase the amount of initial potential energy.

• Remove a hill and decrease the added friction at the end of the track.

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NGSS.MS-PS3-1

NGSS.MS-PS3-2

NGSS.MS-ETS1-1

The NASCAR driver Jimmy Johnson raced around the track at a constant speed of 198 miles per hour. Is there acceleration, yes or no?

• Yes, the speed and direction changed

• No, nothing changed

• Yes, the speed changed

• Yes, the direction changed

As the boat reached the dock, it came to a complete stop. Is there acceleration, yes or no?

• Yes, direction changed.

• No, nothing changed

• Yes, speed changed

• Yes, both speed and direction changed

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NGSS.MS-PS3-5

NGSS.MS-PS2-2

Which runner has the greater speed? ________________________

• Runner A

• Runner B

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NGSS.MS-PS3-1

Frank throws the same ball three different times. The diagram below shows the top speed at which the ball traveled during each throw.

• The ball had the most kinetic energy during the first throw.

• The ball had the most kinetic energy during the third throw.

• The ball had the most kinetic energy during the second throw.

• The ball had the same kinetic energy during all three throws.

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

What is the difference between speed and velocity?

• Speed contains direction and velocity does not

• Velocity contains direction and speed does not

• Speed can be measured and velocity can’t be measured

• There is no difference between the two terms

Directions: The graph shows the velocity of moving car over time. During which two intervals did the car have a positive acceleration?

• 0.0-2.0 s and 8.0 – 10.0 s

• 4.0-5.0 s and 11.0-12.0 s

• 5.0-8.0 s and 10.0-11.0 s

• 4.0-5.0 s and 8.0-10.0 s

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NGSS.MS-PS2-2

Directions: Analyze the distance-time graph and answer the following question. The Point of Reference is the goal post. Which statement corresponds with Segment AB?

• We marched in place.

• We marched from the goal post to the big tree.

• We marched from the big tree to the goal post.

• We marched from the school to the goal post.

Tags

NGSS.MS-PS3-1

Which situation is an example of increasing potential energy?

• Pulling a wagon uphill

• Emptying a bucket of water

• A cat jumping from a tree

• A bicyclist stopping at a stop sign

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NGSS.MS-PS3-2

Which example best illustrates kinetic energy?

• A light bulb that is turned on.

• A car that is parked on top of a hill.

• A comet that is flying through space.

• A battery that is connected to a circuit.

Tags

NGSS.MS-PS3-1