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Physical Science Ch 2 & 3 Test Review

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_______ is the rate of change in position. Motion

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_______ is how far an object has moved. Distance

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_______ is the distance from the starting point. Displacement

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_______ is the distance an object travels per unit of time. Speed

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_______ is any change over time. Rate

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_______ is the equation for speed. Speed = distance time time

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_______ is the speed at a given point in time Instantaneous speed

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_______ is total distance traveled divided by total time. Average Speed

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_______ describes both the speed and direction of an object. Velocity

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The difference between velocity and speed is _______. Direction

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_______ is the rate of change in velocity. Acceleration

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_______ is negative acceleration. Deceleration

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_______ is the equation for acceleration. Acceleration = Velocity Time Time

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The Greek letter _______ (Δ) stands for _______. Delta change change

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A _______ is a push or pull one body exerts on another. Force

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_______ forces are equal in size, but opposite in direction. Balanced

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_______ forces always cause a change in motion of an object. Unbalanced

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_______ forces never cause a change in motion of an object. Balanced

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_______ force is when two or more forces combine. Net

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_______ is the reason why a table cloth can be quickly removed from a table without disturbing the place settings. Inertia

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State Newton’s first law of motion. An object moving at constant velocity keeps moving at that velocity unless a net force acts on it.

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_______ is the force that opposes motion between two touching surfaces. Friction

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State Newton’s second law as an equation. F=ma

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_______ is the value of acceleration due to gravity on the earth. 9.8 m/s 2

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What is the equation for weight of an object on the earth? W = mg

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_______ is the force air exerts on a moving object. Air Resistance

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_______ is the area where two surface “bumps” stick together. Micro welds

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State three types of friction. Static, Sliding, & Rolling

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_______ friction occurs when an object is not moving. Static

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_______ friction is the force opposing motion 2 touching surfaces where micro welds constantly break & reform. Sliding

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_______ is the highest velocity that will be reached by a falling object. Terminal Velocity

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Terminal velocity is when _______ is equal to _______. Acceleration due to gravity Airresistance

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Explain why according to Newton’s 2 nd law of motion why players can’t hit or throw a softball as far as a baseball. Same force is applied thing with greater mass will have a slower acc., so softball bigger mass, will be moving slower than baseball.

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_______ is the reason that a person can safely parachute from a high-flying plane. Air Resistance

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Why is it that you do not feel the gravitational force between your hand and a pencil that you hold in your hand? In comparison, your hand is insignificant

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_______ is the measure of the force of gravity on an object. Weight

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Does gravity have any effect on the mass of a substance? NO

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What are the four basic forces? GravityElectromagnetic Weak Nuclear Force Strong Nuclear Force

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_______ is anything that is thrown or shot through the air. Projectile

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_______ motion of a projectile is due to gravity. Vertical

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_______ _______ is acceleration toward the center of a curved or circular path. Centripetal Acceleration

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_______ _______ is a force acting toward the center of a curved or circular path. Centripetal Force

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Explain why something in orbit of the earth seems to be weightless. All falling at same speed

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If an object was in circular motion, what path would it travel if the motion stopped? Straight line

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State Newton’s third law of motion. For every action there is an equal but opposite reaction

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According to Newton’s third law of motion, forces come in _______. pairs

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_______ is a property that a moving object has because of it’s mass and velocity. Momentum

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_______ is the equation for momentum. p = m v

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State the law of conservation of momentum. Momentum can neither be created nor destroyed it just changes forms

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_______ states that momentum can neither be created nor destroyed it just changes forms. Law of Conservation of Momentum

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