Forces on Systems

Forces on Systems

Assessment

Flashcard

Science

9th Grade

Hard

Created by

Barbara White

FREE Resource

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20 questions

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1.

FLASHCARD QUESTION

Front

System Noun

[sis-tuhm]

Back

System


A collection of multiple objects chosen for analysis that interact with each other through various forces and are treated as a whole.

Example: The Earth and Moon form a system where gravity is the force that pulls the Moon towards the Earth, keeping it in a stable orbit.
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2.

FLASHCARD QUESTION

Front

Free-body diagram Noun

[free-bod-ee dahy-uh-gram]

Back

Free-body diagram


A diagram used to model and visualize all the external forces acting on a single object or a system of objects.

Example: This diagram shows an object as a simple box, with arrows representing all the forces acting on it. Each arrow's direction and labeled size (in Newtons) show the force's direction and strength.
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3.

FLASHCARD QUESTION

Front

Acceleration Noun

[ak-sel-uh-rey-shuhn]

Back

Acceleration


The rate of change of an object's velocity, with a system's acceleration being defined by its center of mass.

Example: Acceleration is a change in velocity. This can mean speeding up, slowing down (negative acceleration), or changing direction, even at a constant speed.
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4.

FLASHCARD QUESTION

Front

External Force Noun

[ek-stur-nl fawrs]

Back

External Force


A force exerted on a system by an object outside of that system, which can change the system's overall motion.

Example: A person pushing a box is an example of an external force, a push or pull originating from outside a system and acting on it.
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5.

FLASHCARD QUESTION

Front

Internal Force Noun

[in-tur-nl fawrs]

Back

Internal Force


A force exerted by one object within a system on another object that is also within the same system.

Example: The arrows labeled 'B' show internal forces, like air pressure, acting within the soccer ball system to maintain its shape.
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6.

FLASHCARD QUESTION

Front

Newton's Second Law Noun

[noo-tuhns sek-uhnd law]

Back

Newton's Second Law


The principle stating a system's acceleration is determined by the net external force divided by the system's total mass.

Example: This diagram shows the formula for Newton's Second Law (F=ma), explaining that Force equals mass multiplied by acceleration and labeling the units for each.
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7.

FLASHCARD QUESTION

Front

Newton's Third Law Noun

[noo-tuhns thurd law]

Back

Newton's Third Law


The principle that for every action, there is an equal and opposite reaction, explaining why internal forces cancel.

Example: A person pushes on a wall (action force), and the wall pushes back on the person with an equal and opposite force (reaction force).
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