Material from Year 9

A measure of the amount of matter in an object

kg

A measure of the force of gravity on an object

Newtons

balance

Newton-meter

Mass x gravitational field strength

m x g

N/kg

the measure of how much mass there is per cubic cm/m of an object

kg/cubic metre

mass/volume

m/v

the amount of force exerted per unit area of a surface

Pascals, N/m squared

force/area

F/A

The larger the surface area, the smaller the pressure because it is distributed over a bigger area

Extension is directly proportional to force until the spring reaches it's elastic limit

A plot showing how an object extends as the force applied increases. For an elastic object, the gradient should be linear up to the limit of proportionality. The gradient gives the spring constant.

one that does not regain its original shape when the forces deforming it are removed

one that regains its original shape when the forces deforming it are removed

the measure of how far you travel in a set amount of time

m/s, mph, km/h

distance/time

d/t

The rate at which velocity changes

m/s squared

change in velocity/time taken

(v-u)/t

Thinking distance + braking distance

Your speed and your reaction time (affected by tiredness, drugs, alcohol, old age and inexperience)

Your speed, the mass of your vehicle, the condition of your brakes and tyres, weather conditions and the road surface

It doesn't because the amount of matter in an object stays the same.

Your weight changes based on the gravitational pull on the planet you are on. The amount of gravity is based on the size of the planet, the bigger the planet, the stronger the gravitational pull. So the higher the gravity, the higher your weight.

place the cuboid on the top pan balance and record its mass in grams
use a ruler to measure the length (l), width (w) and height (h) of a cuboid
calculate the volume of the cuboid using: volume= l×w×h (where measurements are in cm and the volume is in cm3)
use the measurements from steps 1 and 3 to calculate the density of the substance using : density= mass/volume (p= m/V)
repeat and average

place an empty measuring cylinder on the balance and measure its mass in grams
add liquid into the measuring cylinder and measure its new mass
calculate the difference: mass of liquid = (cylinder mass) - (overall mass)
read the volume at eye level
use the volume and the difference to calculate the density of the liquid using: density= mass/volume (p= m/V)
repeat and average

place the object on the balance and record its mass in grams
fill the eureka can until the water is level with the bottom of the pipe
place a measuring cylinder under the pipe, ready to collect the displaced water
carefully drop the object into the can and wait until no more water runs into the cylinder
measure the volume of the displaced water at eye level
use the mass and volume of the displaced water to calculate the density of the object using: density= mass/ volume (p= m/V)

the average density of an object determines whether it floats or sinks- a solid object will float in water if it has a lower density than water

your body is spread out across the whole bed so hundreds of nails are supporting your body's weight, not just one, so your body shouldn't exert enough pressure on one singular nail for it to puncture your skin

they have a large surface to help distribute the weight of your body on the snow so you don't sink

Air is composed of molecules, all of which have a mass and constantly weigh down on you

create a ramp using a flat surface
measure the length of the ramp, using a metre ruler, to find the distance the car will travel
mark where the car is starting (so it starts in the same place every time)
using a stopwatch, measure the time it takes the car to go down the ramp
using the equation: speed= distance/time, calculate the speed of the car
repeat to find an average speed

Line graph used to show the speed of a moving object

speed= distance/time (x and y axis)

density x gravitational field strength x depth