Science - Energy & Forces Flashcards
What is the definiton of energy?
The ability to do work
Name an energy transformation that occurs when you use a microwave
Electrical -> Chemical or Mechanical -> Light, Heat, Sound
Name some types of Energy
- potential,
- kinetic (motion),
- chemical,
- elastic,
- electrical, -
- thermal/heat,
- sound,
- light
- gravitational potential energy
What unit is Energy measured by?
Joules/KiloJoules
What is the Law of Conservation of Energy
Energy cannot be created nor destroyed
What do we use to measure force?
Newton (N)
What is Friction?
Friction is an opposing force when two objects are in contact
What is a force?
A force is a push or a pull that occurs when two objects interact.
What is Energy Efficiency?
Energy Efficiency is the energy amount of energy inputted into an object compared to the useful energy outcome of an object.
What is the calculation for Energy Effeciency?
Efficiencey= Useful Energy output
—————————— x 100
Total Energy Input
What does energy does friction cause?
Heat
What is magnetism?
The force exerted by magnets that attract or repel other magnets
What is the resultant/net force?
The total amount and difference between measurement in forces.
What are balanced Forces
Balanced Forces are two equal forces in size and opposite in direction
What are unbalanced forces?
Unbalanced forces are two or more forces, unequal in zie and direction
What are magnetic fields?
Magnetic fields are invisible lines of force.
What do Like poles of magnets do?
Repel
What materials are natural magnets?
Iron, Nickel, Cobalt
What do opposite poles of magnets do?
Attract
What is gravity?
Gravity is an attractive force acting between objects that have mass.
What are some examples of technological developments that
have contributed to finding solutions to reduce the impact of
forces in everyday life?
Seatbelt, Airbags, Shock absorbers, Crumple zones in cars, Helmets, etc.
What is mass?
The amount of substance in an object
Does Mass change?
No
What is the unit of mass?
Kg
What is weight?
Is the force of gravity (g) acting on the object
Does Weight change?
Yes weight changes from place to place.
What is the unit of weight?
Newtons (N)
How do you calculate Weight?
W = Mass(m) x Gravity(g)
W= mxg
W= mg
Will my mass be higher on the moon than the earth?
No it will be the same
Will my weight be higher on Jupiter than Earth
Yes because the amount of gravity increases.
What is buoyancy force?
A force that makes you float
What is applied Force?
A force that occurs when you apply force to an object like a push or a pull.
