exam revision Flashcards
What is net force
Overall force acting upon an object
what does a spring balance measure
measures the weight of an object
how does a spring balance measure
Measures by opposing the force of gravity acting with the force on an extended spring.
What’s an unbalanced force
One force is bigger than the other forces. It will win the ‘tug of war’
What’s the formula
Weight (N)= Mass (kg) X gravity (n/kg)
What is the kg on earth
10 n/kg
How much does 1kg equal
I0n/kg
How does planets effect gravity
The bigger or smaller the planet is the greater or little the pull of gravity is.
Does mass ever change?
No
What is friction
Friction is a contact force and is whenever an object comes into contact with another object.
What does friction do to objects
It’s when objects rub together. It slows down moving objects and rough surfaces carry a lot of friction
What are the rules of drawing a force diagram
You have to draw the direction of the arrow as it shows the direction of the force. The length of the arrow indicates the strength of the force.
Is a forwards force greater than friction how do we know this?
A forwards force is greater than friction. This can be seen by a long red arrow pointing forwards. This unbalanced force makes a box speed up.
what happens to friction when you apply brakes
When applying brakes, the force of friction is longer than driving force the longer. the longer is behind the more it slows down
What are the four forces on an aircraft?
There is weight which is gravity. lift which is an upward force. thrust that is a push force, thrust that gets an aircraft moving and drag which is air resistance.
how do you increase friction?
Rough surfaces: surfaces rub against each other to create friction. heavy objects: gravity pulling one surface onto another increases their interaction. size: The more surface area and object has the most space to rub against other object . speed: The fastest something is moving The more friction will push back.
How do you decrease friction
ball bearing: less of the objects touching. lubricants: oil, soapy water, water. shape: makes more object streamlined
What does traction do?
friction offers more traction. traction allows up to move forward. smooth surface is less traction. balance friction= traction
What’s a magnetic field?
Space around a magnet with a magnetic force is felt. It’s a noncontact force.
What are poles?
The magnet force is strongest at the polls. Same polls = like polls different poles = unlike poles opposites attract.
What has earth got to do with magnets?
Earth acts like a giant magnet. It has a natural magnet field. Always points towards north. North has the strongest magnetic force.
what is matter made up of?
Matter Is made up of tiny particles called atoms. Atoms are made up of neutrons and electrons.
What charges are they?
Neutrons is no charge. Protons is a positive charge. Electrons are a negative charge. And the nucleus is the lines.
What does friction do to electrons?
Friction between materials causes electrons to move from one object to another. Electrons build up and cost something to be charged.
What levers do?
levers are a force multipliers as they multiply your effort. They work by pivoting a load around a fulcrum using effort.
FLE
FLE stands for Fulcrum load and effort. A example of this is scissors, the scissors effort are the handles, The Fulcrum is the screw and the load is the paper..
what is the acronym for living in non-living?
The acronym is Mr. N C grew. It stands for move, reproduce, nutrition, cells, grow, respond, exchange, waste, and water.
what is the linnaean classification order?
it is kingdom, phylum, class, order, family, genus, and species. A acronym for this is keep pond clean or frogs get sick. There is the order which is genus first and species second.
What are decomposers
Decomposes of every traffic level. They are snails, fungi, bacteria, and worms.
What’s a vertebrate?
A vertebrae is an animal that has a backbone and a skeleton