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Worksheetsmotion and forces
Total questions: 50
Worksheet time: 37mins
what 2 things do you need to know to calculate the speed of an object?
the distance travelled
a jet of steam
time taken
the speed
the pressure
what's the equation for calculating speed
Speed = distance/pressure
Speed=distance / density
Speed = distance / time
what units doe we commonly use to measure speed
m/s
km/h
kg
mph
g/cm³
if a car travels 120km in 2 hours what is its speed
120/6=20km/h
120/2=60km/h
160/2=60km/h
if a boy is walking at 4mph, how long will it take for him to walk a mile
60/4=15mins
60/4=5mins
60/5=15mins
if a snail travels 8cm/min, how far will it travel in 30 minutes
8*30=2400
8*30=240
8*3=240
on a distance/time graph what goes on the x axis
distance
speed
time
energy
how does a distance/time graph show when an object is moving faster
line placates
line gets steeper
line stays the same
the line goes down
what does it mean when a distance/time graph has a horizontal line
the object is staying at the same speed
the object is decelerating
the object is accelerating
the object stopped moving
how do you calculate average speed of an object over the whole journey
average speed = total distance/total time taken
average speed=total time/total distance
what's the equation for calculating pressure
pressure=mass / density
pressure = force / area
pressure = distance / time
what are the units for measuring pressure
Pa
N/cm²
N/cm³
joules
kilojoules
if the area under a man's feet is 250cm², and he weighs 750N, what's the pressure under his feet?
(a)
if a girl weights 450N how big do her snow shoes need to be to exert a pressure of 1.5N/cm²
450/1.5=300
450/1.5=150
450/15=300
why do wearing snowshoes make it easier to walk on snow
weight is spread out over larger area, decreasing pressure so you don't sink into snow
weight is spread out over smaller area, decreasing pressure so you don't sink into snow
weight is not spread out, so you don't sink into snow
why does a sharp knife cut better than blunt knife
it has a smaller area in contact with the object, so the pressure is greater
it has a sharper blade so will cut through easier
it has a smaller area in contact so the pressure is smaller
what's density
a measure of how tightly packed a substance is and relates the mass of a substance to how much space it takes up
the process of tightly packing a substance that relates the mass to how much space it takes up therefore the more space it takes up, the more packed it is.
what's the equation for density
density = mass/area
density= mass/volume
density = mass/weight
a brick has dimension 10cm by 10cm by 3cm and has a mass of 1050g. what is its volume
350cm³
300cm²
300cm³
300cm
a brick has dimension 10cm by 10cm by 3cm and has a mass of 1050g. what is its mass
1050kg
1050g
100g
10.50g
a brick has dimension 10cm by 10cm by 3cm and has a mass of 1050g. what is its density
3.5g/cm³
35g/cm³
0.35g/cm³
how do you measure the density of irregular objects
find the mass of the object using a mass balance then find the volume by dropping the object into beaker of WATER. the change in the volume of water is the same as the volume of the object
find the mass of the object using a mass balance then find the volume by dropping the object into beaker of ACID. the change in the volume of water is the same as the volume of the object
what can forces do
change speed of object
change drag of object
change direction of object
change shape of object
change current of object
how can you draw the effect of a force
with a ruler
with an arrow
with a symbol
with a line
name contact forces
friction
upthrust
air resistance
water resistance
gravity
name non contact forces
gravity
electrostatic
magnetism
newtons
drag
what do you use to measure forces
newtons
newton meter
ruler
extension of spring
what's the unit of force
Newtons (N)
Kilograms (kg)
Grams (g)
Joules (J)
how can a force deform an object
it can stretch it
it can pull it
it can break it
it can push it
it can compress it
when an object is stretched what is the name of the force that pulls it back into shape
elastic limit
gravity
pull
tension
what does elastic limit mean
the point where the spring will just about go back to its original shape
the point where the spring will not go back to its original shape
the point where the spring will be compressed
what's Hooke's law
extension is proportional: if you double the force you double the extension
extension is disproportional: the force depends on the mass and size
extension is proportional, but only for a few times when adding weights on
what causes friction
when 2 surfaces grip together
when people walk
when people make themselves have a large surface area
when a surface is put on another surface
when can friction be useful
when walking
when you are sliding down a slide
when you are skateboarding
when you are trying to brake on a bike or car
when you are vibing
how can you reduce friction
lubrication
adding water to the surface
name two drag forces
gravity
air resistance
fricton
water resistance
magnetism
what does a drag force do
slows things down
makes it easier to move
makes it faster
how can you reduce drag
by making an object smaller
by waxing your wheels
by making it streamlined
what do you call the area around an object where a force can be felt
vicinity
field
surroundings
atmosphere
what is the link between an object and its field
the further you are from an object the stronger the field gets
the closer you are the weaker the field gets
the further you are from an object the weaker the field gets
what is weight
the force of gravity pulling you down
the further you are from an object the weaker the field gets
it is the force of friction against you on a road
what is the unit of weight
grams
Newtons
Joules
kilograms
what is mass
mass is the amount of matter an object is made up of. it's measured in KG.
mass is the weight of an object. it's measured in kg.
how can you calculate weight
weight = mass * gravitational field
weight = mass * gravitational field strength
on earth how big is gravitational field strength
1N/kg
10N/kg
100N/kg
1000N/kg
why are you weightless in space
there's no gravity
there's no mass
there's no weight
there's no friction
what do balanced forces mean
forces that are same size but opposite directions
forces that are unbalanced
forces that make things turn
what does equilibruim mean
forces that are unbalanced
forces that are the same size and cancel each other out
forces that require movement and air resistance
what can unbalanced forces do
change size of object
change speed of object
change direction of object
change weight of object
change mass of object
what are air and water resistance
push forces
non contact forces
contact forces
drag forces
pull forces
