8th Grade Final Gilbert

Akwankyerɛ

Please complete your assessment and select your answers carefully. This is a review of our learning for this school year.

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Select your class period:

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1

When a comet enters the solar system, it curves toward the sun. Which statement describes why the sun does not move when a comet is nearby?

There is no force exerted on the sun from the comet.

There is no force exerted on the sun unless the sun and comet collide.

The force on the sun from the comet is smaller than the force on the comet from the sun because the comet’s speed is too great.

The force on the sun from the comet is equal to the force on the comet from the sun but does not cause the sun to move because the sun is too massive.

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1

Sasha pulls a block across the floor at a constant speed. Why doesn’t the motion of the block change even though Sasha is pulling on it?

Sasha’s force on the block is balanced by the friction force.

Sasha’s force on the block is balanced by the gravitational force.

If Sasha was not pulling on the block, there would be no forces on the block, and it would speed up.

If Sasha was not pulling on the block, there would be no forces on the block, and it would stop moving.

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The ball exerts a force on the target, causing the target to fall over. But when this happens, the ball bounces backward. Why does the ball bounce backward?

The target exerts a larger force on the ball because the ball is very bouncy.

The ball exerts a larger force on the target, causing the target to have a larger change of motion than the ball.

The target exerts the same size force on the ball, so when the target moves in one direction, the ball moves in the opposite direction.

The ball exerts a smaller force on the target because the ball is smaller than the target, so the target causes the ball to bounce backward.

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1

Two cars travel on a straight road from point A to point B. Both cars accelerate to their maximum speed and then continue at that speed for the rest of the distance. Car 1 accelerates from rest to 20 m/s over 30 s. It reaches point B in 35 s. Car 2 accelerates from rest to 20 m/s over 20 s. It reaches point B in 30 s. Which car uses a larger acceleration to reach its maximum speed, and which car has a larger average speed?

Car 1 has both a larger acceleration and a larger average speed.

Car 2 has both a larger acceleration and a larger average speed.

Car 1 has a larger acceleration, but Car 2 has a larger average speed.

Car 2 has a larger acceleration, but Car 1 has a larger average speed.

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1

The weights of four objects with different masses have been calculated to show how much each object would weigh on four different planets.
Based on the table, which object would have the largest mass and greatest weight on Earth?

Object A

Object B

Object C

Object D

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1

The diagram shows four blocks suspended on identical dynamometers, a tool that is used for measuring the weights of objects. 📷
Which object has the greatest weight?

object A

object B

object C

object D

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1

What relationship is shown in the picture?

Electric force between like ends is attractive.

Magnetic force between like ends is attractive.

Electric force between opposite ends is attractive.

Magnetic force between opposite ends is attractive.

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Which statement describes the charges shown?

Negative charges from the cloth were transferred to the balloon.

Balloons always have more negative charges than positive charges.

Negative charges appeared when the cloth was rubbed on the balloon.

Some of the positive charges on the balloon disappeared when it was rubbed by the cloth.

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1

Jesse tests three magnets by observing how many paper clips he can attach to the north pole in a single chain. He finds that Magnet A holds six paper clips, Magnet B holds five paper clips, and Magnet C holds two paper clips. He warms Magnets A and C in the oven for a few minutes and repeats his procedure. This time, Magnet A holds only four paper clips, Magnet B still holds five paper clips, and Magnet C cannot hold any paper clips. Which statement explains Jesse’s observations?

Warming a magnet unaligned some of the magnetic domains.

The forces produced by a magnet naturally become weaker over time.

Warming a magnet causes the distance of its magnetic force to decrease.

The poles of the magnet become reversed when warmed and cause it to repel the paper clips.

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1

Samantha is making waves in a tub of water by pushing a block up and down at one end of the tub. She observes the properties of each of the waves. What can she say about the properties of the waves?

Pushing harder on the block gives the waves more speed, and they will have a longer wavelength.

Pushing harder on the block gives the waves more speed, and they will have a higher frequency.

Pushing harder on the block gives the waves more energy, and they will have a larger amplitude.

Pushing harder on the block gives the waves more energy, and they will have a faster period.

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Which of these will double the energy of a wave?

Halve the frequency

double the amplitude

halve the wavelength

double the wavelength

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Hamza holds his hand close to a hot surface. He can feel the infrared waves but cannot see them. What explains Hamza’s observation?

Infrared waves can only travel very short distances.

Infrared waves are too dim for his eyes to see them.

Infrared waves have a different wavelength than visible light.

The air absorbs infrared waves before they can reach his eyes.

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1

Which statement describes how sound waves are transmitted through a medium?

Sound waves are transferred from molecule to molecule in a medium.

Sound waves pass through the spaces between the molecules of a medium.

Sound waves push all the molecules of a medium in front of them, creating a shock wave.

Sound waves pass through the molecules of a medium because the molecules are transparent.

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3

The picture shows a wave created by the movement of a rope. Select the answer matching the correct letter for numbers 15, 16, and 17 in the boxes to correctly label the parts of the wave. Some letters may be used more than once or not at all.

15-E , 16-A , 17- D

15-A, 16- B, 17-B

15-A, 16-C, 17-B

15-E, 16-D, 17-A

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True or False?

Nokorɛ

Ɛnyɛ ampa

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1

Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).
Gravity is a___________

a. contact force

b. noncontact force

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Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).
Friction is a___________

a. contact force

b. noncontact force

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1

Analyze the diagram and determine if the statement is true or false.

Nokorɛ

Ɛnyɛ ampa

Ɛhia

1

Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).
magnetic force is a___________

a. contact force

b. noncontact force

8th Grade Final Gilbert

Select your class period:

When a comet enters the solar system, it curves toward the sun. Which statement describes why the sun does not move when a comet is nearby?

Sasha pulls a block across the floor at a constant speed. Why doesn’t the motion of the block change even though Sasha is pulling on it?

The ball exerts a force on the target, causing the target to fall over. But when this happens, the ball bounces backward. Why does the ball bounce backward?

The weights of four objects with different masses have been calculated to show how much each object would weigh on four different planets.Based on the table, which object would have the largest mass and greatest weight on Earth?

The diagram shows four blocks suspended on identical dynamometers, a tool that is used for measuring the weights of objects. 📷Which object has the greatest weight?

What relationship is shown in the picture?

Which statement describes the charges shown?

Samantha is making waves in a tub of water by pushing a block up and down at one end of the tub. She observes the properties of each of the waves. What can she say about the properties of the waves?

Which of these will double the energy of a wave?

Hamza holds his hand close to a hot surface. He can feel the infrared waves but cannot see them. What explains Hamza’s observation?

Which statement describes how sound waves are transmitted through a medium?

The picture shows a wave created by the movement of a rope. Select the answer matching the correct letter for numbers 15, 16, and 17 in the boxes to correctly label the parts of the wave. Some letters may be used more than once or not at all.

True or False?

Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).Gravity is a___________

Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).Friction is a___________

Analyze the diagram and determine if the statement is true or false.

Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).magnetic force is a___________

Select your class period:

When a comet enters the solar system, it curves toward the sun. Which statement describes why the sun does not move when a comet is nearby?

Sasha pulls a block across the floor at a constant speed. Why doesn’t the motion of the block change even though Sasha is pulling on it?

The ball exerts a force on the target, causing the target to fall over. But when this happens, the ball bounces backward. Why does the ball bounce backward?

The weights of four objects with different masses have been calculated to show how much each object would weigh on four different planets.Based on the table, which object would have the largest mass and greatest weight on Earth?

The diagram shows four blocks suspended on identical dynamometers, a tool that is used for measuring the weights of objects. 📷Which object has the greatest weight?

What relationship is shown in the picture?

Which statement describes the charges shown?

Samantha is making waves in a tub of water by pushing a block up and down at one end of the tub. She observes the properties of each of the waves. What can she say about the properties of the waves?

Which of these will double the energy of a wave?

Hamza holds his hand close to a hot surface. He can feel the infrared waves but cannot see them. What explains Hamza’s observation?

Which statement describes how sound waves are transmitted through a medium?

The picture shows a wave created by the movement of a rope. Select the answer matching the correct letter for numbers 15, 16, and 17 in the boxes to correctly label the parts of the wave. Some letters may be used more than once or not at all.

True or False?

Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).Gravity is a___________

Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).Friction is a___________

Analyze the diagram and determine if the statement is true or false.

Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).magnetic force is a___________

The weights of four objects with different masses have been calculated to show how much each object would weigh on four different planets.
Based on the table, which object would have the largest mass and greatest weight on Earth?

The diagram shows four blocks suspended on identical dynamometers, a tool that is used for measuring the weights of objects. 📷
Which object has the greatest weight?

Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).
Gravity is a___________

Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).
Friction is a___________

Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).
magnetic force is a___________

The weights of four objects with different masses have been calculated to show how much each object would weigh on four different planets.
Based on the table, which object would have the largest mass and greatest weight on Earth?

The diagram shows four blocks suspended on identical dynamometers, a tool that is used for measuring the weights of objects. 📷
Which object has the greatest weight?

Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).
Gravity is a___________

Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).
Friction is a___________

Select A for contact force or B for noncontact force each statement to show whether the force is a contact force (A) or a noncontact force (B).
magnetic force is a___________