Physics Semester Exam 24-25

In the above diagram, a student goes from home to the park, then to the movie theater, and finally to the stadium. Each step of the journey is shown as a separate vector. When all of the vectors are added together, which direction is the sum of all the vectors?

A motorcycle starts from rest and speeds up to 40 m/s in 15 s. What is the acceleration of the motorcycle in m/s²? Explain how you would solve the problem in complete sentences.

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NGSS.HS-PS2-1

What happens to the gravitational force between two objects when the distance between them increases by 4 times?

• The force increases to eight its original value

• The force increases to four times its original value

• The force decreases to one-fourth of its original value

• The force decreases to one-sixteenth of its original value

Answer explanation

Because gravity is an inverse square law, by increasing the distance between objects, the force of gravity decreases by the square of the distance. For example, if the distance increases by 2, the force decreases bya factor of 4. If the distance increases by 3, the force deceases by a factor of 9.

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A dogsled team starts at the top of a snowy mountain with 225 units of energy. Using your understanding of energy, and assuming energy is conserved, what is the team's final kinetic energy?

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NGSS.HS-PS3-1

Below is a position vs. time graph. Select the portion of the graph when the velocity of the object was the greatest.

• Between 0 and 1 seconds

• Between 2 and 3 seconds

• Between 1 and 2 seconds

• Between 4 and 5 seconds

The force of friction on an object sliding on a rough surface is —

• perpendicular to the direction of motion.

• opposite the direction of motion.

• in the same direction as the motion of the object.

• inversely proportional to the object's mass.

The image shows a carnival game called "The Strong Man" that requires a player to use a rubber mallet to strike a pad. The more force used by the player to strike the pad, the higher the metal object will rise and possibly ring the bell at the top. Which of the following correctly uses the laws of motion to explain how this game works?

• The metal object knocked into the air has a different mass depending on how hard the pad is hit with the mallet; the harder you hit the pad, the less the object will accelerate.

• The metal object knocked into the air becomes heavier the harder it is hit with the mallet, so more force must be used than usual to make it accelerate.

• The metal object knocked into the air has a constant mass, so the larger the force applied with the mallet, the more the metal object will accelerate.

• The acceleration of the metal object has nothing to do with the mallet.

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When a cannon fires a cannonball, the ball goes forward and the cannon itself moves backward. Using your knowledge of Newton's Laws of Motion and Momentum, explain why this happens?

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NGSS.HS-PS2-2

A model rocket is powered by an inflated balloon as shown below. When the air in the balloon is released, the rocket will move forward. Which of the following statements best applies Newton's Third Law of Motion in this model?

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NGSS.MS-PS2-1

What force in newtons would be necessary to move an object 15 meters if 90 joules of work were applied? Explain how you would solve the problem in complete sentences.

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