Final 8th Grade Q1 Review

Curtis conducts an investigation to determine which brand of paper towels is the most absorbent. He records his findings in the table.

What is the test variable (independent variable) and outcome (dependent variable) in this investigation?

• Test variable: the brand of paper towels Outcome: amount of water absorbed

• Test variable: the liquid used Outcome: amount of water absorbed

• 
    Test: the amount of water absorbed Outcome: brand of paper towels

• Test: the time the towels absorbed water Outcome: brand of paper towels

Caleb wants to know how salt affects the boiling point of water. What is the BEST way for Caleb to collect data to answer this question?

• Bring 1 liter of water to a boil, then add 1 gram of salt and observe any changes.

• Add 1 gram of salt to 1 liter of water and time how long it takes for the water to boil.

• Add 1 gram of salt to 1 liter of water and 10 grams of salt to a second liter; time how long it takes for each to boil.

• Add 1 gram of salt to 1 liter of water and leave a second liter free of salt; time how long it takes for each to boil.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Simran is learning how to design an experiment to test a hypothesis. What is the MOST LIKELY outcome of testing hypotheses in controlled conditions?

• avoiding dangerous conditions during experimentation

• limiting the variables that can affect the experiment

• making the experiment easier to conduct

• keeping the experimental area sterile

Tags

NGSS.MS-PS2-2

How do replication and repeated trials compare?

• During both processes, the original investigator does the experiment again.

• During both processes, a different investigator does the experiment again.

• During replication, a different investigator does the experiment again. During repeated trials, the original investigator does the experiment again.

• During replication, the original investigator does the experiment again. During repeated trials, a different investigator does the experiment again.

The graph shows Tom’s morning routine.

 

Which of the following scenarios BEST describes the graph?

• Tom went for a jog. At the end of his road he bumped into a friend and his pace slowed. When Tom left his friend he walked quickly back home.

• Tom rode his bike east from his home up a steep hill. After a while, the slope eased off. Once at the top, he raced down the other side.

• Tom jogged up a steep hill then went up a slight incline before jogging back down the other side of the hill.

• Tom took his dog for a walk to the park. He set off slowly and then increased his pace. At the park Tom turned around and walked slowly back home.

Some forces can act over a distance, and others can only act by contact.  Which type of force can act ONLY when two objects touch each other?

• electrical

• frictional

• gravitational

• magnetic

The graph below show the motion of three joggers.

Which of the following statements correctly describes the relationship between the joggers?

• Jogger Y is moving at a faster rate than jogger X.

• Jogger Z is farther ahead that joggers X and Y.

• Jogger X is moving at a faster rate than joggers Y and Z.

• Jogger Z is slowing down while jogger X is moving at a constant rate.

Tags

NGSS.MS-PS3-1

Multiple forces can act on the same object at the same time.  When will two forces acting on the same object result in an unbalanced force on that object?

• when the two forces cancel each other

• when the two forces produce a net force of 0 N`

• when the two forces apply different forces from opposite directions

• when the two forces apply the same amount of force from opposite directions

Tags

NGSS.MS-PS2-2

Look closely at the illustration, which shows two groups of particles moving at different speeds.


Which statement correctly describes the energy of the particles in the illustration?

• The particles on the right have more kinetic energy than the particles on the left.

• The particles on the left have more kinetic energy than the particles on the right.

• None of the particles have kinetic energy.

• None of the particles have potential energy.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

What happens when an object is moved against gravity, such as rolling a toy car up a ramp?

• Kinetic energy does not change.

• Potential energy does not change.

• Potential energy decreases as it is transformed into kinetic energy.

• Kinetic energy is transformed into potential energy.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

NGSS.MS-PS3-5