# Shared Flashcard Set

## Details

PH Concepts in Action CH 12
Forces and Motion
33
Physics
02/02/2010

Term
 Force
Definition
 a push or a pull, measured in Newtons
Term
 Newton
Definition
 the unit of force
Term
 Net force
Definition
 the overall result of several forces acting upon an object
Term
 Friction
Definition
 a force that opposes (resists) the motion of objects
Term
 static friction
Definition
 frictional force that opposes motion between two objects that are NOT moving
Term
 sliding friction
Definition
 frictional force that occurs when an object slides over a surface
Term
 rolling friction
Definition
 frictional force as an object rolls over a surface
Term
 fluid friction
Definition
 frictional force as an object moves through a fluid (or air)
Term
 air resistance
Definition
 friction force between and object and the moving air atoms around it
Term
 gravity
Definition
 force acting between any two objects with mass
Term
 terminal velocity
Definition
 maximum speed an object can fall at given its mass and acceleration due to gravity
Term
 projectile motion
Definition
 motion of a falling object after its given initial forward velocity
Term
 Inertia
Definition
 Tendency of an object to resist a change in motion
Term
 Mass
Definition
 Measure of the amount of inertia an object has and depends upon the amount of matter the object contains
Term
 Weight
Definition
 force of gravity acting upon an object
Term
 Momentum
Definition
 the product of an objects mass and velocityP= MV
Term
 How do forces affect the motion of an object?
Definition
 A force can cause a resting object to move or a moving object to accelerate.
Term
 What are the four main types of friction?
Definition
 static, rolling, sliding, fluid
Term
 How do gravity and air resistance affect a falling object?
Definition
 gravity causes the object to accelerate downward, air resistance acts in the opposite direction of the falling and reduces acceleration
Term
 In what direction does Earth's gravity act?
Definition
 downward toward the center of Earth
Term
 Why does a projectile follow a curved path?
Definition
 Because there is a combined force of the forward velocity and the downward force of gravity.
Term
 How does Newton's second law relate force, mass, and acceleration?
Definition
 F = M x AMass & Acceleration are inversely proportional.
Term
 How are weight and mass related?
Definition
 The more mass, the more force of gravity and therefore the more weight.
Term
 Which of Newton's laws states that an object at rest stays at rest and an object in motion stays in motion?
Definition
 Newton's first law: The law of inertia
Term
 When you go to the moon, what changes your mass or your weight? Why?
Definition
 Your weight, the amount of matter in your body is the same but the gravitational pull of the moon is different.
Term
 The law of conservation of momentum states:
Definition
 If not force acts on an object, momentum stays the same. In a closed system momentum is transfered between objects
Term
 What type of forces does Newton's 3rd Law deal with?
Definition
 Action and Reaction Forces
Term
 What are the three universal forces?
Definition
 Gravity, Electromagnetic, Nuclear
Term
 Which of the universal forces can repel and attract?
Definition
 magnetic
Term
 Which universal force is found in the center of atoms?
Definition
 nuclear
Term
 The law of universal gravitaion states:
Definition
 Every object in the universe exerts gravitational force upon every other object in the universe.
Term
 Which universal force is responsible for our tides?
Definition
 gravity
Term
 Which universal force acts over the longest distances?
Definition
 gravity
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