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
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