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26 Cards in this Set
- Front
- Back
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force
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a push or pull
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newton
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(N) unit of measurement for forces
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net force
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the combination of all the forces acting on an object
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balanced forces
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Forces whose net force is 0
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unbalanced forces
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forces whose net force is not equal to 0 and cause a chage in motion
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friction
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a force that oppses motion between 2 surfaces that are in contact
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Why does friction occur?
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Friction occurs b/c no surface is completely smooth. They all have grooves that get caught in those of the other surace when they move past each other, causing friction.
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Ways to increase friction
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-using an object with more mass, and therefore more weight (more downward force)
-pushing surface w/more force onto other (more downward force) -make surfaces rougher |
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Ways to decrease friction
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-using an object w/smaller weight
-use smoother surface/smoothen surface -lubricant -switch from sliding to rolling friction |
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What are the types of friction
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kinetic friction - friction between moving surfaces
static friction - friction that balances and other forces on the object and keeps it not moving |
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Gravity
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the force of attraction between objects that is due to their masses
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types of kinetic friction
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-sliding: results from 2 rough surfaces in motion
-rolling: a wheel in contact w/flat surface -fluid: a gas or liquid opposing motion |
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Newton's Law of Universal Gravitation
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force of attraction btw ll objects depends on madd of objects and distance apart
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Forces involved with projectile motion
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-Gravity: causes object to accel. downward
-Air resist.: causes horizontal accel to decrease |
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Explain falling objects
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-accelerate due to gravity
-accel. decreases b/c of air resis. but sped keeps increasing but at slower rate until accel=0 and travels at a constant speed until hitting ground |
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Weight
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amount of gravitational force exerted on an object
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mass
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amount of matter in an object
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terminal velocity
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the constant velocity of an object in which the force of gravity is equal to the amount of air resis.
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free fall
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motion of a bosy when only force of gravity is acting on the body
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centripetal force
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unbalanced force that causes objects to move in a circular path
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projectile motion
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curved path an object follows when thrown or propelled near the Earth's surface
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Newton's 1st law
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-objects at rest will stay at rest
-objects in motion will stay in motion until acted on by an unbalanced force |
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inertia
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tendency of an object to resist a change in motion
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Newton's 2nd Law
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acceleration of an object depends on the mass of the object and amount of force applied
f=ma |
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Factors Affecting Terminal Velocity
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shape
weight density of air texture of object think of skydivers |
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Newton's 3rd Law
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For every action, there is an equal and opposite reaction
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