Energy And Charge Flashcards
What is a force
- it is a push or a pull
- force is measured in newton (N)
- measured with a spring balance or a scale that is carlibrated in newton
How can a force be exerted on an object
- speeding up or slowing down
- deformation
- rotation
- direction can change
- object can come to stand still
What is Paired forces
Each object exerts a force of equal size on the other object
Ehat types of forces do u get
- non contact or flied forces
- work over a distance
- contact forces
- objects touches another object
Examples of non contact forces
- gravitional
- magnectic
- electrostic
Examples of contact forces
- mechanical force
- applied force
- friction force
- normal force
- tenion force or tenion
- air resistance
- elastic forces in spings
What is gravitional force
- attract without touching
- the larger the mass of objects, the stronger the force of attraction
What is the direction of gravitional attractive force
-towards the centre of the object
What are the examples of objects that attract each other
- the sun and planets
- earth amd moon
- earth and object on the earths surface
What is mass
- the object is indication of the amount of matter that object consists of ( kg )
- the mass of object remin constant
What is weight
- Is the atteactive force that the earth exerts on an object (N)
- the weight of objects change
The moon attracts an astronaut
-six times more weakly than earth
The mass of an object is constant everywhere
But its weight changes
What is magnets force
- it atttacts to objects that are constant in iron, nickel and cobalt
If it has that is it has magnectic propertises
Facts
Steel contains irons
What are ferromagnetic
-materials that are attracted by a magnet
What are magnets
- have north and south pole
- different poles attract
- same poles repel
The earth
- has a core of nickel and iron and acts as a massive magnet
- the magnetic field that is caused by the core has a north and south pole, where the magnetic forces are the strongest
What does a atom consists of
- protons
- neutrons
- electrons
What is electrostatic force
- the force that charged objects exert
- Also the forces between the particles
- push and pull
What is postive charge
- objects released electrons
- will not move
What is negtive charge
- object accepted electrons
- will move
What are like charges
- repel eath other
- these are repulsive forces
Ehat is un like charges
Attract each other
Are attractive forces
What is the energy stored in cells
-potentional energy
What is lighting
-particles and droplets in clouds rub and bump against each other
What does a atom consists of
- protons
- neutrons
- electrons
what is a neutral atom
-made of of equal amount of protons and electrons
eg li 3+ and -3
what is the negtive force
- objects accepted electrons
- will move
What is postive force
- objects released electrons
- will not move
