A person pushes a car with a force of 100 N, how much force does the car exert on the person?

It depends on the person's mass

A student swings a ball on a string above her head. The ball continues to move in a circular path because:

the string applies a force against the ball

gravity pulls the ball downwards

the weight of the string is the same as the weight of the ball

Suzanne wants to grab a book from the middle of a stack of books. She predicts that all the books on top of the book will slide with it when she grabs it quickly. Instead, only the book she grabs slides from the stack, as shown in the diagram below. Which of the statements below explain why this occurred?

B) Objects at rest will remain at rest unless acted upon by an external force.

A) For every action on an object, there is an equal and opposite reaction.

C) Velocity of an object will only increase if the mass of that object changes.

D) The total force exerted on an object equals the mass of that object multiplied by the acceleration of the object.

The following image shows a driver's position in the seat while driving at a constant speed and then after he slams on the brakes. The driver is wearing a seatbelt. Which statement best explains why the seatbelt was necessary in this situation?

The brakes cause the car to slow down, but the driver will continue to move at a constant speed until acted on by an outside force.

The car slows down faster than the driver because the car has a greater mass.

The breaks cause both the car and the driver to slow down, but the car slows down faster because gravity has a greater effect on the car than the driver.

Friction is the only force acting on each object in this situation.

Kayla is investigating if magnets get stronger when they are joined together. She begins by gathering identical magnets and several paper clips. Her plan is to see how many paper clips the magnets will attract from a distance of 5 centimeters. With one magnet, she is able to pick up 3 paper clips. With two magnets, she is able to pick up 5 paper clips. Which prediction about adding a third magnet is best supported by the results of her investigation so far?

Three magnets will attract at least 7 paper clips

three magnets will have a greater magnetic force than two magnets

three magnets will be able to pick up paper clips from a farther distance than two magnets

three magnets will have the same magnetic force as two magnets

Andre wants to show a classmate that a magnetic field exists in the region around a permanent magnet. Which statement would best demonstrate that a magnetic field exists in a region around a magnet?

A magnet held near a small metal ball makes the ball roll across the table

After a magnet touches a paper clip, it lifts the paper clip from the table

The north pole of a magnet sticks to the south pole of a second magnet when they touch

A magnet touched to a metal ring can pick it up out of a box.

The strength of the gravitational force between two objects depends on which of the following? (select all that apply)

C. The distance between objects

A. The mass of the larger object

Doug builds a model roller coaster with three hills, as shown in the diagram. He places a toy car at the top of the first hill and releases it. The car stops at point X. Which change to the model would allow the toy car to travel over all three hills?

Order the three hills from tallest to shortest to provide the potential energy needed for the car to make it over each hill.

Add a loop before the first hill in order to maximize the kinetic energy of the car.

Add a loop after the tallest hill in order to maximize the kinetic energy of the car.

Order the three hills from shortest to tallest so that the potential energy builds up according to the height of each hill.

The diagram below shows two bowling balls of equal mass. Both balls are at rest. Which statement best describes the diagram above?

C. Ball A has more potential energy than Ball B

A. Ball A has more kinetic energy than ball B

B. Ball B has more kinetic energy than Ball A

D. Ball B has more potential energy than Ball A

Which energy transformation happens in the rubber band powered model airplane when it is flown?

Potential energy in the rubber band is transformed into mechanical energy by the propeller

Thermal energy in the rubber band is transformed into chemical energy by the propeller

Chemical energy in the rubber band is transformed into potential energy by the propeller

Kinetic energy in the rubber band is transformed into thermal energy by the propeller

An experiment where two materials react with each other is performed in a closed environment so that nothing escapes. The materials are weighed before the lab and again after. Which of the following describes the weight of the material after the experiment?

They would weigh the same before and after

They would weigh more at the beginning

You would not be able to tell if one weighed more

Which of the following explains why hot water floats on cold water?

The molecules in hot water are farther apart making it less dense

The molecules in hot water are closer together making it more dense

The molecules in hot water are farther apart making it more dense

The molecules in hot water are closer together making it less dense

Which describes how mixtures differ from pure substances?

C. Mixtures can be separated physically

D. Mixtures have only one kind of atom

Iron and oxygen react together to form rust. The total mass of the products:

will be the same as the mass of the reactants

will be less than the mass of the reactants

will be greater than the mass of the reactants

8 3rd Nine Weeks Common Assessment

Authored by Alannah Hill

Science

8th Grade

NGSS covered

Used 7+ times

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55 questions

Show all answers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The attractive force between all objects that have mass is called

weight

gravity

contact force

mass

Tags

NGSS.MS-PS2-4

MULTIPLE SELECT QUESTION

30 sec • 1 pt

Which images show balanced forces? Select all that apply.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

In which scenario will the box move with a force of 5N to the right?

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In which image will the box move right with a force of 20 N?

A) A

B) B

C) C

D) D

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Two students are investigating the effect of forces on the motion of an object. The two students each push on a box, as shown in the picture. Even though the students are pushing the box very hard, the box does not move. Which is the best explanation for why the box does not move?

A) Student A is using more force than Student B.

B) The force of friction from the floor surface is too great.

C) All of the forces acting on the box are unbalanced.

D) All of the forces acting on the box are balanced.

Tags

NGSS.MS-PS2-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Two students are investigating the effect of forces on the motion of an object. The two students each push on a box, as shown in the picture. Slowly, the box starts to move towards Student B. Which is the best explanation for why the box does not move?

A) Student A is using more force than Student B.

B) The force of friction from the floor surface is too great.

C) All of the forces acting on the box are unbalanced.

D) All of the forces acting on the box are balanced.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The moon has a smaller mass than Earth. If you were able to travel to the moon your weight would

increase

decrease

stay the same

change throughout the day

Tags

NGSS.MS-PS2-4

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8 3rd Nine Weeks Common Assessment

The attractive force between all objects that have mass is called

Which images show balanced forces? Select all that apply.

In which scenario will the box move with a force of 5N to the right?

In which image will the box move right with a force of 20 N?

Two students are investigating the effect of forces on the motion of an object. The two students each push on a box, as shown in the picture. Even though the students are pushing the box very hard, the box does not move. Which is the best explanation for why the box does not move?

Two students are investigating the effect of forces on the motion of an object. The two students each push on a box, as shown in the picture. Slowly, the box starts to move towards Student B. Which is the best explanation for why the box does not move?

The moon has a smaller mass than Earth. If you were able to travel to the moon your weight would

Two students are pushing on a cart as shown below. The cart will move as if it were acted on by a single force with a magnitude of

Two students are pushing on a cart as shown below. How would the cart move if the person on the right started pushing with an additional 60 N of force to the left?

Jeannie put her soccer ball on the ground on the side of a hill. Which force acted on the soccer ball to make it roll down the hill?

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