Momentum — Unit test Answers

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The diagram shows Ned’s movement as he left his house and traveled to different places throughout the day.Which reference point should be used to find out how far Ned traveled when he went from the pet store to the swimming pool?

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Which describes an object’s speed when free falling in a vacuum?

The object accelerates until it reaches its terminal velocity.

The object falls at a constant speed because only one force acts on it.

The object falls faster and faster until it strikes the ground.

The object speeds up and then stops when air resistance equals gravity.

Kai was 200 meters north of the library when he remembered he had to return some books to the library. It took him 200 seconds to do the round trip.Which best describes Kai’s roundtrip?

His speed was 1 m/s, and his velocity was 0.

His speed was 2 m/s, and his velocity was 0.

His speed was 1 m/s, and his velocity was 1 m/s north.

His speed was 2 m/s, and his velocity was 2 m/s south.

The diagram shows organisms a diver observed during an ocean dive.

the ocean surface

the ocean floor

the position of the clownfish

the position of the seaweed

What kind of acceleration occurs when an object speeds up?

positive

negative

neutral

zero

What must be included when describing the displacement of an object?

measurement and direction

direction and speed

total distance and position

speed and total distance

What is determined by calculating the slope of the position vs time graph?

position

velocity

distance

displacement

Chen is testing the friction of three surfaces. He pushes the same ball across three different surfaces with the same force and measures the distance the ball rolls over each surfacel. The ball moved ten inches across Surface 1, six inches across Surface 2, and fifteen inches across Surface 3.

Surface 1 is ice, Surface 2 is gravel, and Surface 3 is blacktop.

Surface 1 is gravel, Surface 2 is ice, and Surface 3 is blacktop.

Surface 1 is blacktop, Surface 2 is gravel, and Surface 3 is ice.

Surface 1 is blacktop, Surface 2 is ice, and Surface 3 is gravel.

Levi and Clara are trying to move a very heavy box. Levi is pushing the box with a force of 30 N, and Clara is pulling the box with a force of 50 N. The box exerts a frictional force of 65 N.

There is a net force of 15 N against them and they cannot move the box.

There is a net force of 15 N allowing Levi and Clara to move the box.

There is a net force of 65 N against them and they cannot move the box.

There is a net force of 80 N allowing Levi and Clara to move the box.

Tyler and his family drove from Atlanta to Baltimore. They traveled a total of 678 miles over 2 days.What is the reference point in this scenario?

Atlanta

Baltimore

678 miles

2 days

Engineers are trying to improve a race car. Their goal is to increase the acceleration of the car using the same engine. Which change shows the best application of Newton’s laws of motion to achieve this goal?

increasing the inertia of the car

decreasing the reaction force

increasing the action force

decreasing the mass of the car

The chart shows the bids provided by four contractors to complete a job. Which contractor is the most cost-effective?

Joshua

Carmen

Dante

Alicia

A factory employee spends two hours putting together a car part. A machine can do the same job in thirty minutes.

The employee is four times as time-effective as the machine.

The machine is half as time-effective as the employee.

The employee is half as time-effective as the machine.

The machine is four times as time-effective as the employee.

What is the first stage of both technological design and scientific investigation?

communicate the findings

evaluate the product

identify a problem

conduct background research

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Momentum — Unit test Answers

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