Year 7 physics Flashcards
To do the whole of year 7 physics in a few notes, and cards
What is the difference between a short arrow, and a big arrow
a short arrow represents less force than a big arrow
Which way does the arrowhead always point?
the arrowhead always points in the direction of the force
What does balanced forces mean?
It means that it will either stay stationary or it will stay moving at a constant speed
What does unbalanced forces mean?
It means that one force is stronger than another, thus making the object move
formuler for force in Newtons?
Mass X acceleration
What is net force?
how much it is moving in which direction = force X mass X acceleration
define Mass
total amount of matter on an object (Your mass stays the same no matter where you are)
define weight
how much gravity is affecting an object
define the cause of friction
When two irregularities interlock with each other.
Define the difference between mass and weight
Mass is the amount of matter in an object, whereas weight is the gravitational pull of that object
define acceleration
How quickly a collection of mass changes its motion
define speed
How fast you are going over a certain time.
define the difference between speed and acceleration
speed is defined as the rate of change in distance with respect to time whereas acceleration is how quickly a collection of mass changes its motion
define velocity
When something is accelerating or decelerating, it is changing its velocity
define lift
used to counterweight gravity
define drag
friction, and air resistance that comes when moving, it goes against any force of motion/air resistance
define thrust
the amount of force it is going in a specific direction.
10m|s
accelerating by 10m per second
define 10m|s^2
10 meters per second per second
You change from 0 meters per second to 10 meters per second in a second
define reactional force
reactional force is the weight of the book and the pull of gravity, then the book will fall through, and the table will break.
Define frictional force
always opposes action
define contact force
forces that act when touched
what does a steel core do?
makes an electro magnet weaker
what does adding coils of wire to an electro magnet do?
makes the electro magnet stronger
The electro magnetic field
is like the one found around a bar magnet
What does a smaller current through the coils of wire around an electromagnet?
makes an electro magnet weaker
Which poles of a magnet attract to each other
north and south
The more paper clips attracted to an electro magnet
the stronger the field around the electro magnet
Which poles of a magnet repel each other
south to south
or
north to north
How to find the mass of an object when you know weight and gravitational field strength
m=w/g
How to find the weight of an object when you know the gravitational field, and the mass of an object
w=m*g
How to find the gravitational field of an object when you know the weight, and mass
g=w/m
What is the gravitational pull of earth?
9.83
What is 1n as kg
1kg*m/s^2
What does Kilonewton mean?
equal to 1000 newtons
define independent variable
the variable we change in the experiment
define dependent variable
the variable we measure in the experiment
define control variables
the variable which doesn’t change
What to remember in graphs
- Remember to add measurements
- Put the title at the bottom, it is a figure, not a table
- Make it relative to the information/data given/provided
Always have to start at zero
