Unit 3 Test Corrections

While ice skating, two people push away from each other. Immediately after pushing away from each other, how will their motion change?

• Person 2 will move forward and Person 1 will move backward with greater acceleration.

• Both people will move backward, but Person 1 will move with greater acceleration.

• Both will move backward with equal acceleration

• Person 2 will move backward and Person 1 will move forward with a greater acceleration.

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NGSS.MS-PS2-1

The pictures provided show a toy car moving. With the following forces acting on each toy car, which one will continue to accelerate toward the left?

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NGSS.MS-PS2-2

In which of the following situations will the ball have the greatest acceleration?

• A golf ball with a mass of 0.045 kg is struck with a force of 1 N.

• A baseball with a mass of 0.142 kg is hit with a force of 5 N

• A soccer ball with a mass of 0.45 kg is kicked with a force of 20 N.

• A bowling ball with a mass of 7.2 kg is thrown with a force of 60 N.

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NGSS.MS-PS2-2

In which of the following situations would result in the greatest acceleration?

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NGSS.MS-PS2-2

A dump truck and a car traveling at the same speed crash into each other. They are shown in the image below. How do Newton’s laws of motion apply to the vehicle restraint systems in the vehicles?

Select the INCORRECT answer.

• The force of a crash increased when the either the mass or the acceleration of the vehicle increases

• The dump truck applies more force on the car than the car applies to the dump truck.

• A vehicle restraint system is designed to provide the unbalanced force that stops the passenger

• If the seatbelt did not exist, the driver would continue forward into the dashboard.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

The image provided here shows the forces in newtons (N) acting on six different blocks. In which of the locations will the block experience acceleration?

Click the correct answers.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

Students are investigating how to launch a rocket using a straw, a string, and a balloon. Using the image below, how do Newton’s three laws of motion apply to this scenario?

• Action: friction of straw on string

  Reaction: Air pushing backward

  Balloon will stop when it runs out of air or hits wall

• Action: gas pushing on the outside air as it's released from balloon

  Reaction: Outside air pushing back

  When balloon runs out of air, or a force is applied, Newton's 3rd law occurs

• Action: Gas pushing back on the outside air

  Reaction: Balloon pushing back on air

  Friction of straw on the string will act as a force to stop the balloon

• Action: Balloon pushing on the air

  Reaction: Gas from balloon pushing against the outside air as it is released

  Balloon will run out of stored energy and stop

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NGSS.MS-PS2-1

Students planned an investigation to see how Newton’s laws of motion apply in a baseball game. Which of the answer choices are descriptions of Newton’s law of inertia? Select TWO correct answers.

• The ball's acceleration is dependent on the mass of the ball and force of impact

• The player swings the bat in a forward direction until impact is made with the bat

• The ball is in motion and will continue in motion until acted on by the bat.

• The ball and bat will experience an action-reaction force when they collide.

The images provided here show tectonic plates colliding. According to Newton’s law of inertia, at which plate boundaries would you expect motion to occur?

Click ALL the correct answers.

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NGSS.MS-PS2-2

Which of Newton’s laws of motion is best represented when the car stops but the crash test dummy continues forward?

• The law of action-reaction

• The law of acceleration

• The law of gravity

• The law of inertia