1735949
Descripción
Test por Nicole Saville, actualizado hace más de 1 año
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Creado por Nicole Saville
hace más de 9 años
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Pregunta 1
Pregunta
What is internal energy?
Respuesta
-
when an object has speed
-
the movement of particles
-
the random movement of molecules and the attractive forces between them when they're together
Pregunta 2
Pregunta
What is chemical energy
Respuesta
-
energy can be released when the arrangement of atoms is altered
-
energy can be released by reorganising the protons and neutrons in an atoms nucleus
-
where an object is at a high level in the earth's gravitational field
Pregunta 3
Pregunta
What is energy?
Respuesta
-
the ability to do work
-
the work done by a force
-
work done per unit time
Pregunta 4
Pregunta
Which of these are examples of potential energy?
Respuesta
-
chemical
-
electrical potential
-
electromagnetic
-
gravitational potential
-
nuclear
-
internal
-
sound
-
kinetic
Pregunta 5
Pregunta
What is a kinetic type of energy?
Respuesta
-
where movement is taking place
-
regions where electric, magnetic, gravitational or nuclear forces exist
Pregunta 6
Pregunta
The conservation of energy is: In a closed system, energy may be converted form one form into another but never created or destroyed
Respuesta
- True
- False
Pregunta 7
Pregunta
What is the equation for kinetic energy?
Respuesta
-
1/2mv^2
-
mgh
-
mgv
-
1/2mv
Pregunta 8
Pregunta
What is energy measured in?
Respuesta
-
Joules
-
Newtons/metre
-
Joule metre/second
Pregunta 9
Pregunta
What is work done?
Respuesta
-
focre / distance
-
force x distance moved in the direction of force
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force x energy
-
energy x distance
-
force / time
Pregunta 10
Pregunta
Work done is the energy transferred when a force is mode through a distance
Respuesta
- True
- False
Pregunta 11
Pregunta
What is power and what is it measured in?
Respuesta
-
work done/ time taken
-
watts
-
joules
-
work done x time
Pregunta 12
Pregunta
One watt is the power generated when one joule of energy is transferred to an object.
Respuesta
- True
- False
Pregunta 13
Pregunta
What is weight?
Respuesta
-
The gravitational force on an object
-
mass x gravity
-
the mass of an object
Pregunta 14
Pregunta
What is terminal velocity?
Respuesta
-
the velocity at which an objects drag equals its acceleration force
-
for free fall - when weight = drag
-
the fastest possible velocity
-
when you're accelerating
Pregunta 15
Pregunta
At terminal velocity:
Respuesta
-
kinetic energy is constant
-
the GPE is transferred to the surrounding air as heat
-
The loss in KE is the work done by the drag force
Pregunta 16
Pregunta
The larger the surface area of an object, the smaller the terminal velocity because there is more drag so you don't accelerate as much before drag = weight.
Respuesta
- True
- False
Pregunta 17
Pregunta
The larger the mass, the smaller the terminal velocity
Respuesta
- True
- False
Pregunta 18
Pregunta
What is stopping distance?
Respuesta
-
The time taken for a car to stop
-
The total instance a car travels from the moment the driver sees a hazard
-
The time taken from the moment the driver has pressed the break
Pregunta 19
Pregunta
Factors that increase thinking distance:
Respuesta
-
under the influence of alcohol or other drugs
-
tiredness
-
distractions
-
high speed
-
weather
-
intelligence
Pregunta 20
Pregunta
The work done to stop an object will be equal to the change in kinetic energy of the object
Respuesta
- True
- False
Pregunta 21
Pregunta
Factors that increase breaking distance
Respuesta
-
high speed
-
mass of vehicle
-
road conditions
-
car conditions
-
driver distractions
-
alcohol/drugs
-
tiredness
Pregunta 22
Pregunta
If speed of a car doubles:
Respuesta
-
kinetic energy quadruples
-
work done quadruples
-
breaking distance quadruples
Pregunta 23
Pregunta
An air bag works by:
deflated nylon bag attached to a crash sensor which measures acceleration and detects when you are breaking very sharply. It releases two chemicals which react rapidly and produce nitrogen gas which inflates the airbag.
Respuesta
- True
- False
Pregunta 24
Pregunta
What is trilateration?
Respuesta
-
using four satellites together to determine the position of something
-
The distance from a satellite to the earth
-
The orbit of a satellite
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