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36 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Terminal speed
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Speed at which the acceleration of a falling object is zero, because friction balances the weight
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A falling feather reaches this quickly
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Terminal velocity
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Terminal speed together with the direction of motion
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Fluids
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Liquids and gases are called this
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Friction occurs in this
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Air resistance
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Friction acting on something moving through air
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Notice this when riding a bike
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Free-body diagram
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Shows all forces acting on an object
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Pressure
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Amount of force per unit area
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For a constant force, an increase in area of contact will result in a decrease in this.
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Pascals
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Newtons per square meter
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Pressure is measured in this
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What type of force causes acceleration?
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Unbalanced
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What quantities are related by newtons 2nd law? Pressure
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Mass, force, acceleration
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Pressure equation
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Pressure equals force over area of application
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Inversely
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2 values change in opposite directions
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Newton's second law
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Acceleration produced by net force on an object is directly proportional to the magnitude of the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object
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Acceleration formula
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Acceleration equals net force divided by mass
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T/F: a net force acting on an object causes acceleration
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True
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What quantities are related to pressure?
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Force and area
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What describes pressure the best?
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Force per unit area
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The smaller the area of a given force then...
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... The greater the pressure on that surface
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When does free fall occur?
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When there's no air resistance
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What does the air resistance force an object experiences depends on?
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Speed and area
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When does air resistance occur?
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When there is a higher speed
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What is a force always part of when involving another force?
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Mutual action
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Interaction newtons th
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Mutual action between one thing and another
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A hammer exerting a force on a nail
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Newton's third law
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Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.
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Action force
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Object A exerts a force on object B
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Reaction force
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Object B exerts force on object A
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Action-reaction forces?
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Action: tire pushes road
Reaction: road pushes tire Action: rocket pushes gas Reaction: gas pushes rocket Action: earth pulls ball Reaction: ball pulls earth |
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What three factors must one consider in order to understand why a cannonball moves faster than the cannon.
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Force, mass, acceleration
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A given force exerted on a ---- produces a greater acceleration than the same force exerted on a ----.
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Small mass; large mass
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Upward force that cause birds, helicopters and planes to fly
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Lift
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Action- reaction forces are...
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... Equal and opposite
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Action and reaction forces do not ---- when either forces is external to the system being considered
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Cancel each other out
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When force pairs are internal, they
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Cancel each other out
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When there are two forces that are simultaneous, equal and opposite,
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The objects net force is zero
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If the horse in the horse cart system pushes the ground with a greater force than it pulls on the cart, there is a....
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... Net force on the horse, and the horse cart system accelerates
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Why can't one strike a paper with a force of 200-N?
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Paper is not capable of exerting a reaction force of 200-N and you can't have an action force without a reaction force
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What is there for every interaction between things?
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A pair of oppositely directed forces that are equal in strength
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