Motion Flashcards
Is distance a scalar or vector quantity?
Scaler
because it doesn’t involve direction
Is displacement a scalar or vector quantity
Vector
because it measures the distance and direction in a straight line from an objects starting point to its finishing point
What is the difference between speed and velocity?
Speed is a Scalar (speed is how fast you are with no regard of the direction)
Velocity is a Vector (velocity is a speed given direction)
Show a calculation you can use if you want to measure the speed of an object thats moving with a constant speed?
distance travelled (m)= speed(m/s) x time(s) s = vt (When there isn't a constant speed the formula gives the average((mean)) during that time)
What is the typical speed of a person walking?
1.5 m/s
What is the typical speed of a person running?
3 m/s
What is the typical speed of a person cycling?
6 m/s
What is the typical speed of a car?
25 m/s
What is the typical speed of a train?
30 m/s
What is the typical speed of a plane?
250 m/s
What is the equation you use to find the average acceleration of an object?
Acceleration(m/s²)= final velocity(m/s) - initial velocity(m/s) / time(s)
a= v-u / t
(If deceleration then its a negative number!)
What equation do you use to calculate constant (uniform) acceleration?
Final velocity(m/s) - initial velocity(m/s)= 2 x acceleration(m/s²) x distance(m) v²-u² = 2as
What do flat lines show in a distance-time graph?
Where its stationary
What do straight uphill sections show on a distance-time graph?
its accelerating at a steady speed
what does a steepening curve show on a distance-time graph?
its speeding up
what does a levelling off curve mean on a distance-time graph?
Its slowing down
what does the gradient equal to on a distance-time graph?
speed=distance/time
change in y axis) / (change in x axis
what does the gradient equal in a velocity-time graph?
acceleration= velocity / time
what do flat lines equal on a velocity-time graph?
travelling at a constant speed
what do straight lines going uphill or downhill mean on a velocity-time graph?
Constant acceleration/ de acceleration
What does newtons first law consist?
a resultant force is needed to make something start moving, speed up or slow down
if the resultant force on a stationary object is zero then the object will stay stationary
if the resultant force is moving and the object is zero it’ll carry on moving at the same velocity
What is the equation that calculates the resultant force? (Newtons second law)
Resultant force (N) = Mass(kg) x Acceleration(m/s²) F = ma
What does newtons second law consists?
Large forces are needed to produce large accelerations
What is the equation you use to calculate momentum?
momentum(kg m/s) = mass(kg) x velocity(m/s)
p= mv
