8th Science Exam Review 2024

Which of Newton's laws would explain the behavior of a balloon rising up when released in the air?

• Newton's first law of motion, because the balloon continues moving upwards unless acted upon by another force

• Newton's second law of motion, because the upward acceleration of the balloon depends on the buoyant force and its mass

• Newton's third law of motion, because as the balloon pushes air down, the air pushes the balloon up

• Newton's law of universal gravitation, because the balloon is moving away from the Earth

What caused Thomas to stumble when he stepped on a slippery surface?

• Contact force: his shoe made contact with the slippery surface

• Net force: the push of the surface was equal to the grip of his shoes

• Unbalanced force: the push of the surface was stronger than the grip of his shoes

• Balanced force: his shoe made contact with the slippery surface

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A helicopter is flying north (up) with a force of 100 N and encounters a 40 N tailwind pushing south (down). The lift force generated by the helicopter's rotors is 800 N (up), and the force of gravity acting on it is 760 N (down). What are the net horizontal (north-south) and vertical (up-down) forces acting on the helicopter?

• A. 60 N south (down) and 40 N down

• B. 60 N north (up) and 40 N up

• C. 60 N south (down) and 40 N up

• D. 60 N north (up) and 40 N down

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A student pulls a wagon with a rope. What factor best explains why the wagon starts moving?

• A. balanced forces

• B. gravity

• C. inertia

• D. unbalanced forces

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What is the primary reason a rocket needs to exert a lot of force when launching into space?

• To escape the atmospheric pressure.

• To overcome Earth's gravitational pull.

• To reach a stable orbit around Earth.

• To avoid collision with airborne objects.

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Which of the following is shown below?

• electromagnet

• electric motor

• transformer

• electric generator

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A bar magnet is broken into two pieces. Which statement best describes the magnetic properties of the pieces?

• Each piece becomes a separate magnet with its own north and south poles.

• Only one piece will retain the magnetic properties.

• Neither piece will exhibit magnetic properties anymore.

• The pieces repel each other and do not exhibit magnetic properties.

During a physics class, McKenna, Charlotte, and Libby are analyzing the electromagnetic spectrum data provided. What can be concluded about the relationship between wavelength and frequency from their analysis?

• As the wavelength increases, both its frequency and energy decrease.

• As the wavelength decreases, both its frequency and energy increase.

• As the wavelength increases, its frequency increases and energy decreases.

• As the wavelength decreases, its frequency decreases and energy increases.

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In the figure shown, the distance of one wavelength is (a)   .

• B
• D
• A
• C

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According to the wave diagram, which letter represents the amplitude of the wave?

• H

• G

• F

• J

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