5642565
Descripción
Test por Elliephant Brown, actualizado hace más de 1 año
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Creado por Elliephant Brown
hace alrededor de 8 años
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Pregunta 1
Pregunta
Stationary objects require [blank_start]energy[blank_end] to move, change shape or warm up.
Respuesta
-
power
-
energy
-
heat
Pregunta 2
Pregunta
What is the principle of conservation of energy?
Respuesta
-
Energy can be transformed into other forms of energy.
-
Energy must be conserved.
-
Energy cannot be created or destroyed.
Pregunta 3
Pregunta
Work Done on an object is equal to the Force multiplied by the Distance moved.
Respuesta
- True
- False
Pregunta 4
Pregunta
When work is done on an object, [blank_start]energy[blank_end] is transferred to it.
Respuesta
-
energy
Pregunta 5
Pregunta
Work Done has a unit of Joules (J), which is equal to which of the following base units?
Respuesta
-
kgm^2s^-2
-
Nm
-
kgms^-2
-
kgm^-3
Pregunta 6
Pregunta
The [blank_start]greater[blank_end] the force, or the [blank_start]further[blank_end] the distance, the greater the work done on an object.
Respuesta
-
greater
-
lesser
-
shorter
-
further
Pregunta 7
Pregunta
No work is done on an object when Force and Distance/Displacement are...
Respuesta
-
of equal size.
-
at an angle of 30 degrees.
-
at right angles to each other.
Pregunta 8
Pregunta
The area underneath a Force-Distance graph represents the acceleration of the object.
Respuesta
- True
- False
Pregunta 9
Pregunta
Which of the following apply for a string being stretched?
Respuesta
-
The distance moved by the spring is the extension.
-
Energy is lost during stretching.
-
Are under a Force-Distance graph for a stretched spring is equal to the energy stored in the spring.
-
Energy stored in a spring = Force x Distance.
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Energy stored in a spring = 1/2 x Force x Extension/Change in length.
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A stretched spring obeys Newton's 3rd Law.
-
A stretched spring obeys Hooke's Law, which states that Force is directly proportional to the extension of the spring.
Pregunta 10
Pregunta
Kinetic Energy = 1/2 x mass x velocity^2
Respuesta
- True
- False
Pregunta 11
Pregunta
The slower an object moves, the more kinetic energy it has.
Respuesta
- True
- False
Pregunta 12
Pregunta
Acceleration due to gravity is 10ms^-2.
Respuesta
- True
- False
Pregunta 13
Pregunta
Which of the following is true?
Respuesta
-
potential energy = mass x acceleration due to gravity
-
mgh = 1/2mv^2
-
Work done on an object decreases the gravitational potential energy of the object.
Pregunta 14
Pregunta
When considering a pendulum bob - is it true that the bob passes its equilibrium position with maximum speed, and then slows down when it reaches its maximum height. Meaning that the kinetic energy is equal to the loss of potential energy from its maximum height.
Respuesta
- True
- False
Pregunta 15
Pregunta
Power is the [blank_start]rate of transfer of energy[blank_end].
Respuesta
-
rate of transfer of energy
-
time per Joule
-
time work takes to be done
Pregunta 16
Pregunta
Energy can be transferred from one object to another by the means of:
- work done
-heat transfer
-electricity
-sound waves
-electromagnetic radiation
Respuesta
- True
- False
Pregunta 17
Pregunta
Which of the following apply for engine power:
Respuesta
-
Power = Force x Velocity
-
Obeys Newton's 2nd Law.
-
Resistive forces are equal and opposite to the motive force.
Pregunta 18
Pregunta
Useful power output = Total power supplied/Useful power
Respuesta
- True
- False
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