kinematics

Question 1

what does savut stand for
s
a
v
u
t

Answer 1

DAFIT
D isplacement
A cceleration
F inal velocity
I nitial velocity
T ime taken

Question 2

what are the SI units for savut
s
a
v
u
t

Answer 2

SI units
m
ms^-2 or m/s^2
ms^-1 or m/s
ms^-1 or m/s
s

Question 3

constant speed = constant velocity
constant velocity ≠ constant speed
true or false, explain

Answer 3

true.
cuz speed is a scalar while velocity is a vector
speed means distance travelled per unit of time
velocity means the same but with the addition of direction

So, constant velocity implies both constant speed and constant direction, but constant speed alone doesn’t necessarily imply constant velocity if the direction of motion is changing.

e.g. a car goes in a circular track at a constant speed of 60km/h
speed is constant at 60km/h
velocity however is going up down negative and back to positive. like 2 semi circles

Question 4

Distance definition
scalar or vector

Answer 4

length of path travelled by two positions
scalar

Question 5

displacement definition
scalar or vector

Answer 5

charge in position of an object between two positions. In short, displacement may be viewed as distance in a specific direction.
vector

Question 5

Speed definition
scalar or vector

Answer 5

distance travelled per unit time
scalar

Question 5

velocity definition
scalar or vector

Answer 5

change in displacement per unit time
vector

Question 6

acceleration definition
scalar or vector

Answer 6

change in velocity per unit time
vector

Question 7

what does acceleration refer to

Answer 7

acceleration refers to the rate at which velocity is changing. this change can either refer to a change in magnitude or change in direction or both

Question 8

y is the velocity time graph the most useful

Answer 8

it can obtain all 5 quantities savut

Displacement: Look at the area under the graph. The space between the graph and the time axis shows how far the object traveled.

Initial Velocity: read off

Final Velocity: read off

Acceleration: measure gradient

Time: read off

Question 9

v u a t

Answer 9

v = u + (a)(t)
*used more often

Question 10

s u v t

Answer 10

s = 1/2 (u+v)(t)

Question 11

s u a t

Answer 11

s = (u)(t) + 1/2(a)(t)^2
*used more often

Question 12

s v t a t

Answer 12

s = (v)(t) - 1/2(a)(t)^2

Question 13

v u a s

Answer 13

v^2 = u^2 + 2(a)(s)
*used more often

Question 14

the 5 equations values

Answer 14

v u a t
s u a t
s u v t
s v a t

Question 15

what does positive constant a mean, and what does constant negative a mean

Answer 15

the velocity is increasing at a steady speed and is getting faster.
the velocity is getting slower

Question 16

acceleration is defined as the rate of change of velocity or change of velocity over time.
write the formula for it to calculate acceleration

Answer 16

a = (v - u)/t
(v - u) is the change of velocity

Question 17

how to represent constant on a graph

Answer 17

its a straight line

Question 18

if speed is constant then velocity is? and acceleration is?

Answer 18

velocity is contstant, so acceleration = 0 (no acceleration)

Question 19

acceleration can directly affect speed but speed cannot directly affect acceleration
t/f

Answer 19

true

Question 19

how to express velocity when writing7

Answer 19

write the speed then the direction

Question 19

how to get speed knowing that velocity is 20m/s

Answer 19

speed is the same as velocity without the direction so the speed is also 20m/s

Question 20

What the approximate gravitational acceleration (g)

Answer 20

10m s^-2
(9.8 m s^-2)

Question 20

Freefall definition

Answer 20

Motion of rising or falling object is only under the influence of gravitational forces

Question 20

when can u use equations of motion

Answer 20

1d analysis where acceleration is constant. if the acceleration is

Question 20

Falling under air resistance

Answer 20

Motion of rising or falling object is under both gravitational and resistive forces by air

Question 21

how to find average velocity

Answer 21

(f+i)/2
or
displacement (final position - initial position) / change in time (final time - initial time)