Topic 1 & 2 Forces & Motion Flashcards
(82 cards)
Runner A finishes a race in less time than runner B. Who is faster?
Runner A
What two measurements are needed to calculate speed?
distance and time
What is the SI unit for speed?
m/s
What does acceleration mean?
speeding up or slowing down
What is a force?
push or pull
How do we represent forces on diagrams?
arrows, with length depending on size of force
What does mass mean?
amount of substance
What is the unit for mass?
kilogram
What does a vector have that a scalar does not?
direction
Name a scalar and a vector measured in metres.
distance, displacement
Name a scalar and a vector measured in metres/second.
speed, velocity
Name a vector with units of newtons.
force or weight
Is mass a vector or scalar?
scalar
Is energy a vector or scalar?
scalar
What is acceleration?
a change in velocity
Why is acceleration a vector?
it is measuring a change in another vector
What is the difference between speed and velocity?
velocity has a direction/is a vector
What is the equation for calculating speed?
speed = distance / time
What is the SI unit for speed?
metres per second
What is the equation for average speed?
total distance / time for whole journey
What is the equation for calculating distance?
distance = speed x time
How is a constant speed shown on a distance/time graph?
straight, sloping line
What does a horizontal line on a distance/time graph show?
stationary object
What is the speed of sound in air?
approximately 330m/s