Fri Quiz 1

Question 1

What are the order of prefix quantity?

Answer 1

Tetra (T) 10 12 
Giga (G) 10 9
Mega (M) 10 6
Kilo (k) 10 3
Hecto (h) 10 2
No prefix 10 1
Centi (c) 10 -2
Milli (m) 10 -3
Micro (µ) 10 -6
Nano (n) 10 -9

Question 2

What is Scalar Quantities? What are some examples?

Answer 2

Described by a number and a unit. 
Ex.
-Speed (100km/h)
-Distance (200m)
-Time (15 s)
-Mass (10.35 kg)

Question 3

What is Vector Quantities? What are some examples?

Answer 3

Described by a number, unit and direction
Ex.
-Velocity (100km/h [N])
-Displacement (200m [Down])
-Weight (700 [Down])

Question 4

What is Distance?

Answer 4

(d) The total path length
units (m)

-Scalar Quantity

Question 5

What is Speed?

Answer 5

(v) The magnitude of the velocity
ex. driving 10m/s north or south have the same peed but their velocities are in opposite directions

-Scalar Quantity

Question 6

What is Average Speed?

Answer 6

(Vav) The total distance traveled divided by the total time taken

-Scalar Quantity

Question 7

What is Position?

Answer 7

(Half arrow d) The location of an object relative to a reference point

-Vector Quantity

Question 8

What is Average Velocity?

Answer 8

(half arrow Vav) Displacement divided by the elasped time of the interval

V= d
t

-Vector Quantity

Question 9

What is Velocity?

Answer 9

(half arrow V) Displacement of an object per unit time
SI unit m/s

-Vector Quantity

Question 10

What is Displacement?

Answer 10

( Δ half arrow d) The change in position measured on the shortest path in a straight line
-Does not require a reference point
=final position - the starting point

Δ half arrow d= half arrow d (final)- half arrow d (initial)

• SI unit is m
• Vector Quantity

Question 11

What is Constant Velocity or uniform motion?

Answer 11

An object which moves in one direction in a straight line and covers and equal distance in equal time (zero acceleration)

• Constant speed
• Moving in a straight line, it can not be changing direction

Question 12

What is Acceleration?

Answer 12

(half arrow a) The rate of change in velocity

-SI unit m/s/s or m/s2

Question 13

How to calculate average speed?

Answer 13

Average speed= distance traveled 
            Change in time 
Vave= d/Δ t
t=d/v
d=vxt

-m/s

Question 14

How to convert km/h to m/s?

Answer 14

km/h to m/s /3.6

Question 15

How to convert m/s to km/h?

Answer 15

m/s to km/h x 3.6

Question 16

How to calculate constant velocity?

Answer 16

Average Velocity= Displacement
change in time
Vave= Δ d/ Δ t

GIVE DIRECTION

Question 17

What is the slope of a dt?

Answer 17

Slope of dt graph= Velocity

-Steeper the slope faster the velocity

Question 18

What is the slope of a cord in a dt graph?

Answer 18

Slope of cord= average velocity

Question 19

How to calculate Acceleration?

Answer 19

Acceleration= Change in velocity
Change in time

half arrow aav= Δ v/ Δ t

= Vf-Vi/ tf-ti

Slope of velocity time graph