Answers FL-2002040-MJ Comprehensive Science 1 CRThe Musculoskeletal and Integumentary Systems

Unit Test Answers

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Based on illustrations of magnetic field lines, where could an object be placed so it would not experience a magnetic force?

halfway between the like poles of two magnets, because the field lines bend away and do not enter this area

halfway between the opposite poles of two magnets, because the field lines are the closest together

above the middle of a bar magnet, because the magnetic field lines are only found around the sides of the magnet

above a pole of a bar magnet, because the magnetic field lines either go in or go out at the end

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Katie rolls a toy car off the end of a table.Which path will the car follow when it leaves the table?

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.

A tugboat is pulling a barge into a harbor. The barge is exerting a force of 3000 N against the tugboat.Which force would most likely allow the tugboat to move the barge into the harbor?

4500 N in the opposite direction of the barge

3000 N in the opposite direction of the barge

3000 N in the same direction of the barge

4500 N in the same direction of the barge

Based on the tug of war pictured below, what is the net force?

–190 N

10 N

–10 N

190 N

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.

Badri makes the table below to review the factors that affect the electric force between objects.

changing “Direct” to “Indirect”

changing “Indirect” to “Direct”

changing “Distance” to “Amount of electric charge”

changing “Mass” to “Amount of electric charge”

The diagram shows two charged objects, A and B.

A: positiveB: negative

A: negativeB: positive

A: negativeB: negative

A: positiveB: positive

A positively charged object is placed to the left of a negatively charged object. Which best describes how the positively charged object will move?

to the left, in the direction of the electric field lines

to the right, in the direction of the electric field lines

up in the direction that the field lines bend away

down in the direction that the field lines bend away

The north pole of a bar magnet is moved close to the north pole of a second bar magnet. What prediction best describes how the first magnet responds when it is released?

It will move toward the second magnet because like poles repel.

It will move toward the second magnet because like poles attract.

It will move away from the second magnet because like poles repel.

It will move away from the second magnet because like poles attract.

Oran wants to model the behavior of Earth’s magnetic field when Earth’s magnetic south is near Earth’s geographic north using a ball, a bar magnet, and a compass. He designates the top of the ball as Earth’s geographic north.

Model 1

Model 2

Model 3

Model 4

How are the electric field lines around a positive charge affected when a second positive charge is near it?

The field lines combine with the lines around the second positive charge.

The field lines overlap with the lines from the second positive charge.

The field lines bend toward the second positive charge.

The field lines bend away from the second positive charge.

A scientist on Earth drops a hammer and a feather at the same time an astronaut on the moon drops a hammer and a feather.

The hammer hits the ground before the feather on both Earth and the moon.

The hammer hits the ground before the feather on Earth, but the feather hits the ground first on the moon.

The hammer and the feather hit the ground together on both Earth and the moon.

The hammer hits the ground before the feather on Earth, and the hammer and feather hit at the same time on the moon.

Which best describes a force?

a vector with magnitude and direction

a vector with speed and strength

a vector with direction only

a vector with strength only

The information in the table represents the effect of the mass of two objects on the gravitational force between the two objects.Which number should be in the cell with the question mark?

The number is two because when you double the mass of one of the objects, the force between the objects is halved.

The number is four because when you double the mass of one of the objects, the force between the objects remains the same.

The number is eight because when you double the mass of one of the objects, the force between the objects also doubles.

The number is sixteen because when you double the mass of one of the objects, the force between the objects increases by a factor of 4.

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