# Shared Flashcard Set

## Details

EXAM STUDY TIME: Newton's Second Law
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17
Physics
07/25/2009

Term
 What causes an object to accelerate?
Definition
 When there are unbalanced forces acting on an object.
Term
 Acceleration depends on the __________ force.
Definition
 Net.
Term
 What does acceleration~net force mean?
Definition
 Acceleration is directly proportional to net force.
Term
 Mass in ________ proportional to net force.
Definition
 Inversely.
Term
 Define friction.
Definition
 The force between two materials that touch as they move past each other.
Term
 Friction is mainly due to _________.
Definition
 Air resistance.
Term
 What are the factors that affect the amount of friction between two surfaces in contact?
Definition
 The kind of material and how much they are together.
Term
 What direction does friction act?
Definition
 Friction acts in the opposite direction of the motion.
Term
 When does static friction occur?
Definition
 Static friction occurs when you are just starting to move an object.
Term
 When does sliding friction occur?
Definition
 Sliding friction occurs when an object is in motion.
Term
 Which is the larger quantity, sliding or static?
Definition
 Static friction is a larger quantity.
Term
 What is fluid friction?
Definition
 Fluid friction is friction that occurs in liquids.
Term
 When does fluid friction occur?
Definition
 As on object pushes aside the fluid on it.
Term
 What is a free-body diagram?
Definition
 A diagram showing all forces on an object.
Term
 What are pascals?
Definition
 Pascals are a unit of measurement equal to newtons per square meter.
Term
 Newton explained why objects fell at the same rate. Why?
Definition
 The inertia of the heavier object has more inertia, so it falls slower than the lighter object.
Term
 When does terminal velocity occur?
Definition
 When the acceleration terminates and the forces are balanced.
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