Nebraska NSCAS Science Grade 8 Practice Questions - Nebraska Student-Centered Assessment System Science - Grade 8 Exam - Nebraska NSCAS Science Grade 8 Practice Questions - Nebraska Student-Centered Assessment System Science

Question 1

A student pushes a heavy cart across a level floor at a steady speed. While the cart moves, the student applies a constant forward force, and friction exerts an opposing force on the cart. How do these two forces compare while the cart moves at a steady speed?

The forward force and the friction force are equal in size and opposite in direction. The forward force is larger than the friction force, causing the cart to speed up. The friction force is larger than the forward force, causing the cart to slow down. The two forces cancel out because they act on different objects.

Correct Answer:

The forward force and the friction force are equal in size and opposite in direction.

Question 2

A skydiver falls from an airplane. After falling for several seconds, she stops speeding up and continues downward at a constant terminal velocity. Which statement best explains why her speed becomes constant?

Air resistance increases with speed until it balances the force of gravity on her. Gravity becomes weaker as she gets closer to the ground. Her mass decreases as she falls, reducing the gravitational force. There is no air resistance acting on her once she reaches terminal velocity.

Correct Answer:

Air resistance increases with speed until it balances the force of gravity on her.

Question 3

Two ice skaters stand facing each other on frictionless ice. Skater A pushes Skater B. Skater A has twice the mass of Skater B. Which statement correctly describes the forces and resulting motion?

Each skater feels a force of the same size; the lighter skater accelerates more. Skater A feels a smaller force because Skater A is more massive. Skater B feels a larger force because Skater B is pushed. Both skaters accelerate at the same rate because the forces are equal.

Correct Answer:

Each skater feels a force of the same size; the lighter skater accelerates more.

Question 4

A ball is thrown straight up. At the highest point of its path, which statement about the ball's velocity and the forces on it is correct? (Ignore air resistance.)

Its velocity is zero for an instant and gravity still acts downward on it. Its velocity is zero and no forces act on it at that instant. Its velocity is upward at that instant and gravity acts downward. Its velocity is downward at that instant and gravity acts upward.

Correct Answer:

Its velocity is zero for an instant and gravity still acts downward on it.

Question 5

A car accelerates from rest and its speed increases. A student claims the car's kinetic energy doubles when its speed doubles. Is this claim correct, and why?

No. Kinetic energy depends on the square of the speed, so doubling speed quadruples kinetic energy. Yes. Kinetic energy is directly proportional to speed, so doubling speed doubles the energy. No. Kinetic energy does not depend on speed at all. Yes. Kinetic energy triples when speed doubles because of momentum.

Correct Answer:

No. Kinetic energy depends on the square of the speed, so doubling speed quadruples kinetic energy.

Question 1

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Prepare with the Nebraska NSCAS Science Grade 8 Practice Questions - Nebraska Student-Centered Assessment System Science - Grade 8 Exam practice quiz. This question bank includes 76 questions covering student, earth, force, speed, and explains. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Nebraska NSCAS Science Grade 8 Practice Questions - Nebraska Student-Centered Assessment System Science - Grade 8 Exam

This practice set contains 76 questions from the matching question bank and focuses on student, earth, force, speed, and explains. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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Nebraska NSCAS Science Grade 8 Practice Questions - Nebraska Student-Centered Assessment System Science - Grade 8 Exam

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