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41 Cards in this Set
- Front
- Back
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Why are kinetic and potential energy considered complimentary?
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because when Ek = 0, Ep = x and vice versa.
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How do you get mechanical energy?
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Ek + Ep = Em
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What is kinetic energy?
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the energy an object possesses due to its motion (back and forth)
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What is the formula for kinetic energy and what are the units?
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Ek = 1/2mV^2
m = kg v = meters per second |
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What is potential energy?
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the possible energy associated with an object based on its height, mass and gravity
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What is the formula for potential energy and what are the units?
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Ep = mgh
m = kg h = meters g = N/kg --> 9.8 on Earth |
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What are the 2 basic states of motion for any object?
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1) at rest
2) moving |
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What 4 factors is motion made up of?
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1) distance (m)
2) time (s) 3) speed/velocity (m/s) 4) acceleration (m/s^2) |
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What is the difference between speed and velocity?
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both have magnitude, although only velocity has direction --> speed is scalar while velocity is vector
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What are forces measured in (2 forms)?
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1N = 1kg x m/s^2
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What are the 3 ways forces can change motion (explain)?
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1) acceleration: continuous force in the same direction as movement, which increases velocity
2) deceleration: force exerted in the opposite direction of movement (the object is said to undergo a negative acceleration/deceleration until it stops) 3) modification: force exerted on one side of a moving object (deflects the object --> it is also considered acceleration) |
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What is the difference between mass and weight?
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mass is the quantity of matter in a given object, and no matter where it is in the universe, it is a constant while weight depends on gravitational force.
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What is the formula for weight and what are the units?
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w = m x g
w = weight m = kg g = gravitational field intensity --> N/kg |
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What factors do gravitational force depend on and what do they mean?
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- the larger the mass, the more attraction
- the smaller the distance, the more attraction |
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What is normal force?
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the force of support on an object that touches a surface
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What is frictional force?
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the force that a surface exerts when an object moves in the direction opposite to the movement. it acts in the opposite direction to interfere with the movement of the object
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What is the net force?
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the sum of all forces acting on an object (force in the direction of movement = positive, force in the opposite direction of movement = negative
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What is energy?
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The capacity to do work or produce change
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What is energy?
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The capacity to do work or produce change
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What is the difference between an energy transfer and an energy transformation?
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Transfer: when the same type of energy is moving from one place to another
Transformation: when energy is changing from one form to another |
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What is energy?
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The capacity to do work or produce change
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What is the difference between an energy transfer and an energy transformation?
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Transfer: when the same type of energy is moving from one place to another
Transformation: when energy is changing from one form to another |
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What is the formula for energy efficiency?
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Energy efficiency % =
Eout or Eused/ Ein or Eavailable |
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What is energy?
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The capacity to do work or produce change
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What is the difference between an energy transfer and an energy transformation?
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Transfer: when the same type of energy is moving from one place to another
Transformation: when energy is changing from one form to another |
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What is the formula for energy efficiency?
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Energy efficiency %
= Eout or Eused X 100/ Ein or Eavailable |
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What is energy efficiency?
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Measuring how much energy is produced compared to the energy put in
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What is thermal energy?
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A measurement of the excitement of particles and the amount of particles
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What is specific heat capacity?
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How much energy (joules) would be required to raise 1g of the material by 1•C --> -Q=Q
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What is thermal energy?
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A measurement of the excitement of particles and the amount of particles
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What is specific heat capacity?
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How much energy (joules) would be required to raise 1g of the material by 1•C --> -Q=Q
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What is water's specific heat capacity (c)?
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4.19j/g•C
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What is thermal energy?
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A measurement of the excitement of particles and the amount of particles
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What is specific heat capacity?
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How much energy (joules) would be required to raise 1g of the material by 1•C --> -Q=Q
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What is water's specific heat capacity (c)?
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4.19j/g•C
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What is the formula for specific heat capacity?
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Q = MC🔼T
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What is thermal energy?
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A measurement of the excitement of particles and the amount of particles
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What is specific heat capacity?
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How much energy (joules) would be required to raise 1g of the material by 1•C --> -Q=Q
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What is water's specific heat capacity (c)?
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4.19j/g•C
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What is the formula for specific heat capacity?
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Q = MC🔼T
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The lower the c value, the _______ energy is takes to change temperature. What does this not mean?
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Less --> this does not mean that a low c will have more heat
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