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# Physical Science State Assessment Review - PowerPoint PPT Presentation

Physical Science State Assessment Review. S.HS.2B.1.1. Newton’s First Law of Motion (law of inertia) – an object in motion stays in motion at a constant velocity and an object at rest stays at rest unless acted upon by an outside force This outside force is usually friction.

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### Physical Science State Assessment Review

S.HS.2B.1.1

• Newton’s First Law of Motion (law of inertia) – an object in motion stays in motion at a constant velocity and an object at rest stays at rest unless acted upon by an outside force

• This outside force is usually friction.

• friction – a force that acts between two materials that are in contact with each other as they move past one another

• The more smooth a surface is, the less friction it applies.

• Only when friction is present do we need a force to keep the object moving. Without friction a moving object would never stop.

• Types of friction:

• sliding friction – when two surfaces slide past each other

• rolling friction – when a round object rolls over a flat surface

• fluid friction – friction between a fluid (any liquid or gas) and the surface of an object

• Air resistance is a type of fluid friction.

• Air Resistance:

• All objects, regardless of their size or mass, accelerate toward the surface of the Earth at a rate of 9.8 m/s/s.

• Gravity is the force that causes this acceleration.

• As objects fall they experience friction with the air (fluid friction).

• This air resistance is a force that acts in the opposite direction of gravity.

• terminal velocity - – the point at which a falling object stops accelerating because the force of air resistance becomes equal to the force of gravity

• 1. An object is pushed with a force and begins to move across a frictionless surface. Which best describes the object’s motion after the force stops acting?

• A. constant velocity

• B. increasing velocity

• C. variable acceleration

• D. decreasing acceleration

• 1. An object is pushed with a force and begins to move across a frictionless surface. Which best describes the object’s motion after the force stops acting?

• A. constant velocity – correct answer

• B. increasing velocity

• C. variable acceleration

• D. decreasing acceleration

• 3. Which of the following statements best describes air resistance?

• A. The rolling friction experienced between an object and the air.

• B. A force of gravity.

• C. The fluid friction experienced between an object and the air as the object falls.

• D. The sliding friction experienced between an object and the air.

• 3. Which of the following statements best describes air resistance?

• A. The rolling friction experienced between an object and the air.

• B. A force of gravity.

• C. The fluid friction experienced between an object and the air as the object falls. – correct answer

• D. The sliding friction experienced between an object and the air.