TRANSLATIONAL MOTION Flashcards
what is a vector
A physical quantity that has both direction
and magnitude
what is a scalar
A physical quantity that has magnitude but no direction
what does an arrow indicate about a vector
Arrows can be used to reveal the direction of the vector
what does arrow length indicate about a vector
The length of the arrow will reveal the magnitude of the vector
is 5 metres (m) a vector or a scalar
scalar
is 30m/s east a vector or a scalar
vector
is 5 miles north a vector or a scalar
vector
is 20 degrees celsius a vector or a scalar
scalar
is 256 bytes a vector or a scalar
scalar
is 4000 calories a vector or a scalar
scalar
what is the value for tan 30, 45 and 60
√3/3
1
√3
A lady walks 4 m east, 2 m south, 4 m west, and finally 2 m north, what is her displacement
0m
A lady walks 4 m east, 2 m south, 4 m west, and finally 2 m north, how much total distance did she cover
12m
what type of quantity is speed
scalar
what type of quantity is velocity
vector
how are the units of velocity expressed
length/time
e.g. m/s
ft/s
miles/hour
what is the equation for speed
speed = distance/time
what is the equation for velocity
velocity = displacement/time
A man walks 8 km east in 2 hours and then 7 km west in 1 hour.
a) What is the man’s average speed for the whole journey?
distance = 15km (8 + 7) time = 3 hours (2+1)
speed = distance/time
= 15/3
= 5
5km/h
A man walks 8 km east in 2 hours and then 7 km west in 1 hour.
b) What is the man’s average velocity for the whole journey?
displacement = 1km time = 3hours
displacement/time
= 1km / 3
= 0.33333 recurring
0.33km/h
what is acceleration
rate of change in velocity
what type of quantity is acceleration
vector
what are the units for acceleration
m/s2 or
length of time squared
what is the formula for acceleration
Acceleration = rate of change of velocity/time
a = (vf - vi) / t
how do you calculate acceleration from a table of values
a = (vf - vi) / t
- take the final velocity and minus it from the initial velocity
- divide value by time taken
what is uniformly accelerated motion
involves constant acceleration
what does constant acceleration mean
both the magnitude and direction of acceleration must remain constant
what happens if a particle exhibits uniform accelerated motion
it will accelerate at a constant rate
what is the symbol for time
t
what is the symbol for displacement
x
what is the symbol for velocity
v
what is the symbol for acceleration
a
what are the three linear motion equations
- x = xo + vot + 1/2at^2
- v = vo + at
- v2 = vo2 + 2ax
what is the average velocity equation
Vavg = 1/2 (v + vo)
what is negative acceleration
deceleration
