Physics chapter 2
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| How is balance important in our lives? | Relationships- family and friends
Finances- expenses and earnings
nature- energy radiated by the earth and solar energy input from the sun
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| what does mechanical equilibrium mean? | forces are balanced so no change in motion
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| Motion would be changed if there was ___ | unbalanced external force
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| Why is a force needed with an object? | to change its state of motion
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| what is a force? | a push or pull
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| a state of motion may be __? | at rest or moving
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| if a hockey puck is not moving remains until a force hits it. it is? | at rest
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| hockey puck sliding along ice until a force stops it is? | moving
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| what is the combination of all forces acting on an object? | net force
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| How many forces does a net force have acting on an object? | usually more than one
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| what does a net force do? | changes the motion of an object
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| What is the scientific unit of force? | Newton
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| What does net force depend on? | Magnitude and direction of all applied forces
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| If you push a rock up as hard as gravity is pulling down what happens? | rock does not move
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| If you push harder than gravity on the rock upward what happens? | the rock goes upward
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| if you push with less force on the rock what happens? | the rock moves downward
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| what is tension? | the upward force acting on a suspended object
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| what is tension sometimes called? | a stretching force
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| what is the downward force caused by gravitational pull? | weight
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| if two forces are equal and opposite, what is the net force? | zero
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| if the net force is zero then what does the object do? | remains at rest
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| how are vectors produced? | when the arrow is scaled to represent the amount of the force and the direction of the arrow points in the direction of the force
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| what is a vector? | an arrow that represents both magnitude and direction of a quantity
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| what does a vector quantity need? | both magnitude and direction for a complete direction
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| what is a scalar quantity? | a quantity that can be described by magnitude only and has no direction
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| what are some examples of scalar quantities? | time, area, and volume
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| What can scalar quantities do? | can be added, subtracted, multiplied or divided like ordinary numbers
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| when applied forces act in the same way what do u do? | add them
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| when applied forces are acting in opposite directions what do u do? | subtract
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| what is a state where no physical changes occur? | mechanical equilibrium
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| EF=0 | equilibrium rule
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| what is EF=0? | "when the sum of the forces acting on an object is zero the object is in mechanical equilibrium
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| what should the sum or suspended objects equal in equilibrium? | zero
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| If upward forces are positive and downward forces are negative what does the sum equal? | zero
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| Equilibrium is either at rest or | at constant speed ina straight line path
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| if an object has one force on it what is happening? | it cannot be in equilibrium
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| what is one force acting on the object doing? | pushing
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| the second force is acting in the opposite direction is the force of ____ | friction
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| what does objects that are at rest said to be? | in static equilibrium
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| objects moving at a constant speed in a straight line path are said to be in what? | dynamic equilibrium.
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| what is a car on cruise control? | dynamic
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| what is a girl hanging from a trapeze? | static
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| what is a flower pot on a window sill? | static
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| what is a hockey puck sliding across the ice? | dynamic
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| what is an airplane in flight? | dynamic
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