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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.

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Physical Science State Assessment Review

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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


Questions

  • 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


Questions

  • 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


  • 2. An object is pushed with a force and experiences friction. Which best describes the motion of this object after the force stops acting?

    • A. constant velocity

    • B. increasing velocity

    • C. variable acceleration

    • D. decreasing velocity


  • 2. An object is pushed with a force and experiences friction. Which best describes the motion of this object after the force stops acting?

    • A. constant velocity

    • B. increasing velocity

    • C. variable acceleration

    • D. decreasing velocity – correct answer


  • 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.


  • 4. Choose the surface or substance that would apply the greatest amount of friction.

    • A. air

    • B. a tile floor

    • C. a carpeted floor

    • D. motor oil


  • 4. Choose the surface or substance that would apply the greatest amount of friction.

    • A. air

    • B. a tile floor

    • C. a carpeted floor – correct answer

    • D. motor oil


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