Show:
time, speed and distance
frame of reference
friction
air pressure, air resistance
floating
100
what are three ways in which motion can be described?
position, direction and speed
100
what is a frame of reference?
a background marker
100
what force causes your tennis shoes to wear out?
friction
100
does air have weight?
yes
100
archimedes used a method known as water displacement to measure what?
the gold in the crown
200
how would the line graph of a runner look when he went faster and faster?
the line would go up
200
is it possible for the same set of facts to be interpreted in more than one way?
yes
200
which force is greater, rolling friction or sliding friction?
sliding friction
200
is air pressure greater at sea level or on a mountaintop?
at sea level
200
what word does archemedes use instead of water?
fluid
300
what is the formula for calculating speed?
divide the distance by the time
300
why do you need a frame of reference?
to compare changes
300
friction can be measured with what piece of equipment?
a spring force measure
300
is there gravity on the moon? is there air around the moon?
yes, no
300
why does a heavy object feel lighter under the water then above the water?
because you have the help of the bouyant force
400
what two things do you need in order to calculate speed?
time and distance
400
can a scientific theory change into a scientific fact when more evidence is obtained?
no
400
what do we call the tendency of all matter to resist starting to move?
inertia
400
what is the air pressure on every square inch at sea level?
14.7 lb.
400
if a boat weighs more then the water that it displaces, will it sink or float?
sink
500
what is the source of energy for a wind up toy?
a wind up spring
500
can you tell which boat is moving unless you have a frame of reference?
no
500
is inertia a force?
no it is the property of all matter
500
if you know the volume and the weight mass of an object, you can calculate what?
the density