What is energy?
Measure of what an object can do
Measure of the matter an object has
Measure of the distance covered per unit time
Energy is measured in
Which one of the option listed below are types of energy?
Nuclear potential energy
Acidic energy
Kinetic energy
Gas energy
Energy can be destroyed.
Energy can be transformed from one type to another.
is a way of transferring energy.
Work done is a measure of energy.
What unit does work done have?
Joules
Watts
Volts
Kilograms
Work done calculates how much energy is needed to move an object with a force speed height( force, speed, height ) and a distance.
What is the equation for work done?
Work done = force*distance
work done=energy /time
The force is measured in (N)
The distance is measured in centimetres.
Power calculates :
the rate at which energy is delivered
the speed of something
P=E/t
The unit of power is watt Volt Joules( watt, Volt, Joules ) (W) and the time energy distilation( time, energy, distilation ) is always in seconds (s).
Efficiency shows the percentage of energy that is converted into:
useful energy
wasted energy
Efficiency = 100(Useful energy output/ total energy input)
The energy contained in foods is energy.
What is a calorie?
unit of energy used for how much energy is in food
unit of speed for how fast a vehicle can travel
1 Kcal =4841J
What is an energy resource?
Where the energy comes from
where the source of energy comes from
What is a non-renewable energy resource?
resource that will one day run out
it will never run out
Where does energy for tidal power come from?
the sun
the moon
Nuclear power is when radio active material , usually uranium or thorium , is bombarded with neutrons.
What is the difference between biomass and biofuel?
biomass is used to produce biofuel
biomass is bigger than biofuel
What is speed?
it's the distance covered per unit tme
it's the height covered per unit time
s=d/t
What is the unit for speed?
m/s
mph
What is the unit for distance?
metres
kilometres
On a distance time graph, the steeper the line , the the object is moving.
On a distance time graph, a line shows a constant speed.
Velocity describes the at which something is travelling and the
Acceleration = velocity / time
What is a contact force?
it acts directly on the object
it acts at a distance from an object
A diagram shows all the forces acting on a single object.
What is weight?
the force on an object due to mass and the amount of gravity.
the amount of matter an object has
What is the equation for weight?
Weight =mass *gravity field strength
W=mg
W=v/t
On the earth the gravity is
On the moon the gravity is
What are forces measured using?
Newton meter
ammeter
The units for force are:
newtons
amps
Newton's first law- Unbalanced forces cause an acceleration.
Newton's second law -An object's mass affects how much force is needed to accelerate it.
According to Newton's second law, what's the equation for acceleration?
acceleration=force/mass
acceleration=mass/force
The unit for acceleration is m/s
The unit for mass is kg
What is newton's 3rd law?
Forces acting on an object come in pairs
Force is the same as gravity
What is electricity?
The movement of charged particles, generally electrons.
movement of acceleration.
is the rate of flow of charge.
Voltage is the per charge.
Resistance is a measure of how hard it is for to flow.
A conductor allows energy to flow through it as it has many free electrons.
What does an ammeter do?
Measures the current in a series circuit
Measures the current in a parallel circuit
The current in a series circuit is the same all around the circuit.
The longer the wire, the lower the resistance.
power = current * voltage
The diode allows current to flow in 1 direction.
A motor converts into kinetic energy.
The thermistor changes resistance with water.
The buzzer converts electrical energy into energy.
