Energy Bell Ringer

Kinetic energy is energy of motion. The kinetic energy of an object is dependent on two variables, speed and mass and can be represented by the formula:

KE = 1/2mv².

Four balls were rolled at a set of wooden pins. The balls were rolled with different amounts of force so that they traveled at approximately the same speed. Will there be a difference in the amount of pins knocked down? Explain.

• A)No. The factor that will determine how many pins fall has nothing to do with the motion of the balls.

• B)Yes. The balls increase in mass. The ball with the greatest mass will have the most KE and probably knock down the most pins.

• C)No. All the balls are moving with the same speed, so they will all have the same amount of KE and knock down the same amount of pins.

• D)Yes. Because it takes varying amounts of force to roll each ball at the same speed, the ball rolled with the most force will knock the pins the hardest.

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Predict which item has the GREATEST INCREASE in kinetic energy. Assume both planes reach identical velocity.

• A)Passenger airplane lands at an airport

• B)Passenger airplane takes off at an airport

• C)Small private airplane takes off at an airport

• D)Small private airplane lands at an airport

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Which of these graphs BEST represents the kinetic energy of a roller coaster going around a loop?

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Kinetic energy is energy of motion. The kinetic energy of an object is dependent on two variables, speed and mass and can be represented by the formula:

KE = 1/2mv²

Sammie is speeding done the road in his race car. Sammie passes one car after another. Sammie has more kinetic energy than the cars he is passing. He pulls up to a BIG truck and the two are traveling neck and neck down the highway. Is there any difference in the kinetic energy of the truck and Sammie's car? Explain.

• A)They have the same kinetic energy because kinetic energy is energy of motion.

• B)The truck has more kinetic energy than the car because the mass of the truck is greater.

• C)The car has more kinetic energy because Sammie had been traveling very fast for a longer period of time.

• D)The vehicles have the same amount of kinetic energy because they are traveling at the same speed; they are neck and neck.

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You pull into a gas station and fill up your car with gasoline. During the time you are filling up, the car has

• A)kinetic energy only.

• B)potential energy only.

• C)both potential and kinetic energy.

• D)neither potential or kinetic energy.

Joshua's physics lab group has been assigned a project of designing a model bobsled track. Each group will roll a marble down the track with the objective of having their marble finish with the fastest time. Assume that the track is frictionless, and the length of all tracks is the same. They can use a small marble with a mass of 15g or a large marble with a mass of 20g. What should his team do to give their marble the most potential energy?

• A)They should use a small marble with the ramp at a 45° angle.

• B)They should use a large marble with the ramp at a 60° angle.

• C)They should use a large marble with the ramp at a 75° angle.

• D)They should use a small marble with the ramp at a 60° angle.

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Astronaut Mark Kelly and his crew traveled to the International Space Station in the space shuttle. The shuttle burned off all remaining fuel before entering Earth's atmosphere. When the shuttle returned to Earth it landed at a speed of approximately 354 km/hr or 220 mi/hr, about 20 times the landing speed of a commercial aircraft. What accounts for the shuttle's speed upon landing?

• A)Earth's atmosphere

• B)initial thrust of take-off

• C)angle of approach upon landing

• D)gravitational potential energy

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According to the picture, how would the gravitational potential energy of the car change if its weight was doubled?

• A)The gravitational potential energy would be doubled.

• B)The gravitational potential energy would stay the same.

• C)The gravitational potential energy would be cut in half.

• D)The gravitational potential energy would be increased by 750.

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