PHYS 1010 FINAL (UNE) EXAM WITH
CORRECT ANSWERS
True or False: Useful work is the work done by an external system - correct answers False (done ON an external
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system)
A box is pulled across a floor. If the magnitude of the force was increased but the angle was kept constant, the
j j j j j j j j j j j j j j j j j j j j j j
work done by the force would (increase/decrease) - correct answers Increase
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If the force and displacement are not collinear, which formula is used?
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W = F*d cos(Θ)
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or
W = F*d sin(Θ) - correct answers W = F*d cos(Θ)
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True or False: Work is done on a locked door that remains closed while you try to pull it open. - correct answers
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False (no movement/distance)
j j
True or False: Work is done on an object as you drop it from the second floor of a building to the ground floor. -
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correct answers True (is movement/distance)
j j j j
True or False: Work is done on dishes when you pull a tablecloth out from under them and they remain in place. -
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correct answers False (no movement/distance)
j j j j
, True or False: Energy cannot be created or destroyed within a closed system with constant mass - only
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transformed to other forms - correct answers True j j j j j j j
What is NOT a unit of power? j j j j j j
• kilowatt
j
• J/s
j
• horsepower
j
• kcal - correct answers kcal
j j j j j
If the net work on a system is zero, and the mass is constant, the final velocity must be ______ to the initial
j j j j j j j j j j j j j j j j j j j j j j j
velocity. - correct answers equal j j j j
True or False: The majority of energy consumed by the human body is used to maintain the basal metabolic rate
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- correct answers True
j j j
Is this a statement of conservative force or a non-conservative force?
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Mechanical energy is transferred to thermal energy due to friction along the path - correct answers Non-j j j j j j j j j j j j j j j j
conservative force j
True or False: The change in kinetic energy will be equal to the negative change in potential energy in a
j j j j j j j j j j j j j j j j j j j j
conservative system - correct answers True j j j j j
Yes or No: Do devices with efficiencies less than one violate the law of conservation of energy - correct answers
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No (energy is removed from the system as thermal energy)
j j j j j j j j j
In an INELASTIC collision you have two objects of the same mass colliding at the same speed but opposite
j j j j j j j j j j j j j j j j j j j
directions. The objects will... - correct answers Collide and stay stationary j j j j j j j j j j
Object two has twice the mass of object one & both masses have the same velocity. Therefore object two has
j j j j j j j j j j j j j j j j j j j j
______ the momentum of object one. - correct answers twice j j j j j j j j j
CORRECT ANSWERS
True or False: Useful work is the work done by an external system - correct answers False (done ON an external
j j j j j j j j j j j j j j j j j j j j j
system)
A box is pulled across a floor. If the magnitude of the force was increased but the angle was kept constant, the
j j j j j j j j j j j j j j j j j j j j j j
work done by the force would (increase/decrease) - correct answers Increase
j j j j j j j j j j
If the force and displacement are not collinear, which formula is used?
j j j j j j j j j j j
W = F*d cos(Θ)
j j j
or
W = F*d sin(Θ) - correct answers W = F*d cos(Θ)
j j j j j j j j j j
True or False: Work is done on a locked door that remains closed while you try to pull it open. - correct answers
j j j j j j j j j j j j j j j j j j j j j j j
False (no movement/distance)
j j
True or False: Work is done on an object as you drop it from the second floor of a building to the ground floor. -
j j j j j j j j j j j j j j j j j j j j j j j j j
correct answers True (is movement/distance)
j j j j
True or False: Work is done on dishes when you pull a tablecloth out from under them and they remain in place. -
j j j j j j j j j j j j j j j j j j j j j j j
correct answers False (no movement/distance)
j j j j
, True or False: Energy cannot be created or destroyed within a closed system with constant mass - only
j j j j j j j j j j j j j j j j j j
transformed to other forms - correct answers True j j j j j j j
What is NOT a unit of power? j j j j j j
• kilowatt
j
• J/s
j
• horsepower
j
• kcal - correct answers kcal
j j j j j
If the net work on a system is zero, and the mass is constant, the final velocity must be ______ to the initial
j j j j j j j j j j j j j j j j j j j j j j j
velocity. - correct answers equal j j j j
True or False: The majority of energy consumed by the human body is used to maintain the basal metabolic rate
j j j j j j j j j j j j j j j j j j j j
- correct answers True
j j j
Is this a statement of conservative force or a non-conservative force?
j j j j j j j j j j
Mechanical energy is transferred to thermal energy due to friction along the path - correct answers Non-j j j j j j j j j j j j j j j j
conservative force j
True or False: The change in kinetic energy will be equal to the negative change in potential energy in a
j j j j j j j j j j j j j j j j j j j j
conservative system - correct answers True j j j j j
Yes or No: Do devices with efficiencies less than one violate the law of conservation of energy - correct answers
j j j j j j j j j j j j j j j j j j j j
No (energy is removed from the system as thermal energy)
j j j j j j j j j
In an INELASTIC collision you have two objects of the same mass colliding at the same speed but opposite
j j j j j j j j j j j j j j j j j j j
directions. The objects will... - correct answers Collide and stay stationary j j j j j j j j j j
Object two has twice the mass of object one & both masses have the same velocity. Therefore object two has
j j j j j j j j j j j j j j j j j j j j
______ the momentum of object one. - correct answers twice j j j j j j j j j
