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The formula for kinetic energy is: - PowerPoint PPT Presentation


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Tue Jan 31 Today Review hw 5.5 Read p293-295 (p280) 83,87,91 (p307-9) 56, 61,76,81,82 ch 10-11 test next Tue. or Wed.!. The formula for kinetic energy is:. K=(mv 2 )/2 K=( mv ) 2 /2 K=2mv 2 K=(mg)/h. 0 of 30. The SI units for energy and work are:. Newtons Watts Joules Amperes.

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Tue Jan 31 Today Reviewhw 5.5 Read p293-295 (p280) 83,87,91 (p307-9) 56, 61,76,81,82ch 10-11 test next Tue. or Wed.!

the formula for kinetic energy is
The formula for kinetic energy is:
  • K=(mv2)/2
  • K=(mv)2/2
  • K=2mv2
  • K=(mg)/h

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the si units for energy and work are
The SI units for energy and work are:
  • Newtons
  • Watts
  • Joules
  • Amperes

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kinetic energy is a quantity
Kinetic energy is a ____ quantity
  • Tensor
  • Scalar
  • Vector
  • Negative

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the transfer of energy by mechanical means is called
The transfer of energy by mechanical means is called _______.
  • Heat
  • Machination
  • Work
  • Force

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work is done when
Work is done when:
  • A force acts through a distance.
  • A hot object touches a cold object.
  • A force acts perpendicular to a displacement
  • You sleep on the job.

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energy stored in an object that has been lifted in a gravitational field is called
Energy stored in an object that has been lifted in a gravitational field is called:
  • Elastic potential energy
  • Gravitational potential energy
  • Chemical potential energy.
  • Thermal energy.

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if an object s speed doubles its kinetic energy
If an object’s speed doubles its kinetic energy:
  • Quadruples
  • Doubles
  • Is cut in half.
  • Doesn’t change

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How much work is done if you push a 5.0 kg box 12 meters across the floor while applying a 10.0 N force?
  • 50 J
  • 60 J
  • 120 J
  • 600 J

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describes how quickly energy is transferred
_____ describes how quickly energy is transferred.
  • Kinetic energy
  • Velocity
  • Power
  • Pressure

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the si units of power are
The SI units of power are:
  • Joules
  • Teslas
  • Pascals
  • Watts

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a watt is equal to
A Watt is equal to
  • N m
  • J s
  • N/m2
  • J/s

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slide15
I have 1.2 kW microwave. How much electrical energy is converted if I heat something on high for 30 seconds?
  • 40 J
  • 400 J
  • 600 J
  • 36 kJ

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if the power output of a motor is 65 w how long does it take to do 195 j of work
If the power output of a motor is 65 W, how long does it take to do 195 J of work?
  • 1.95 seconds
  • 3.0 seconds
  • 260 seconds
  • 3.5 hours

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is where we decide to set gravitational potential energy to zero
________ is where we decide to set gravitational potential energy to zero.
  • The null zone
  • Outer space
  • The reference level
  • On top of spaghetti

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which of the following is a conservative force
Which of the following is a conservative force?
  • Friction
  • Thrust
  • Gravity
  • Air resistance

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A 4.0 kg object is moving has 72 J of kinetic energy when it is 3.0 m above the reference level. Its speed is
  • 2.0 m/s
  • 5.0 m/s
  • 6.0 m/s
  • 192 m/s

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A 4.0 kg object has 72 J of kinetic energy when it is 3.0 m above the reference level. Its total mechanical energy is
  • 0.0 J
  • 72 J
  • 120 J
  • 192 J

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A 4.0 kg object has 72 J of kinetic energy when it is 3.0 m above the reference level. Once it falls down to the reference level it will have a kinetic energy of

  • 72 J
  • 120 J
  • 192 J
  • 0.0 J

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simple machines can not
Simple machines can NOT
  • Multiply the force that is exerted
  • Multiply the work that is done
  • Change the direction a force is exerted
  • Change the speed

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the mechanical advantage of a simple machine describes
The mechanical advantage of a simple machine describes
  • How much the machine multiplies the work you do
  • How much the distance is multiplied
  • How much the force is multiplied
  • How much the power is multiplied

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the efficiency of a machine describes
The efficiency of a machine describes:
  • The ratio of the output work to the input work
  • The ratio of the output force to the input force
  • The ratio of the output distance to the input distance

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if a machine has a mechanical advantage of 5 0 how much force must you exert to lift a 60 kg object
If a machine has a mechanical advantage of 5.0 how much force must you exert to lift a 60 kg object?
  • 60 N
  • 120 N
  • 300 N
  • 3.0 kN

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An input of 8.0 kJ of work is is provided to a machine that exerts a 2.0 kN force through a distance of 3.0 meters. What is the efficiency?

  • 25%
  • 37.5 %
  • 75%
  • 133%

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a pulley is used to raise a 2 0 kg object 50 cm off of the table the work done by the machine is
A pulley is used to raise a 2.0 kg object 50 cm off of the table. The work done BY the machine is:
  • 1.0 kJ
  • 100 J
  • 10.0 J
  • 1.0 J

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A pulley is used to raise a 2.0 kg object 50 cm off of the table. The person pulling the string exerts a force of 8.0 N through a distance of 2.0 m. How much work is done by the person?

  • 1.0 J
  • 10.0 J
  • 4.0 J
  • 16 J

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slide29

A pulley is used to raise a 2.0 kg object 50 cm off of the table. The person pulling the string exerts a force of 8.0 N through a distance of 2.0 m. The mechanical advantage of the machine is

  • 4.0
  • 2.5
  • 2.0
  • 0.50

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A pulley is used to raise a 2.0 kg object 50 cm off of the table. The person pulling the string exerts a force of 8.0 N through a distance of 2.0 m. The efficiency of the machine is

  • 31%
  • 63%
  • 100%
  • 160%

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slide31

A pulley is used to raise a 2.0 kg object 50 cm off of the table. The person pulling the string moves their hand 2.0 m. What is the IMA of the machine?

  • 4.0
  • 2.5
  • 0.25
  • 10.0

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