Renad Notes

Question 1

SI unit of length

Answer 1

Meters m

Question 2

SI unit of mass

Answer 2

Kg

Question 3

Electric current si unit

Answer 3

Ampere

Question 4

Kelvin k is the si unit for?

Answer 4

Thermodynamic temp

Question 5

Mole (mol) is the si unit

Answer 5

The amount of substance.

Question 6

The si unit for luminous intensity is?

Answer 6

Candela (cd)

Question 7

Femto prefix

Answer 7

1 x 10^-15

Femtometer

Question 8

Pico-prefix

Answer 8

1 x 10^-12

Picofarad

Question 9

Nano-prefix

Answer 9

1 x 10^-9

Nanosecond

Question 10

Micro-prefix

Answer 10

1 x 10^-6

Microgram

Question 11

Milli-prefix

Answer 11

1 x 10^-3

Milliohm

Question 12

centi- prefix

Answer 12

1 x 10^-2

Centimeter

Question 13

Base prefix

Answer 13

1 x 10^0

Newton

Question 14

Kilo prefix

Answer 14

1 x 10^3

Kilogram

Question 15

Mega prefix

Answer 15

1 x 10^6

Megajoule

Question 16

Giga prefix

Answer 16

1 x 10^9

Gigavolt

Question 17

Tera prefix

Answer 17

1 x10^12

Teraohm

Question 18

Examples of vector

Answer 18

Displacement 
Velocity 
Weight
Force 
Electric field

Question 19

Scalars examples:

Answer 19

Distance
Speed
Mass
Energy
Time
Temperature 
Work
Pressure

Question 20

To find the angle in vectors we use?

Answer 20

Tan

Question 21

What are the 4 equations of motion?

Answer 21

Vf= vi + at
🔺x= vi.t +1/2 at^2
Vf^2= Vi^2 + 2a🔺x
🔺x=1/2(vi +vf)t

Question 22

The object is accelerating when

Answer 22

1. If it changes speed
2. If it changes direction
3. If it changes direction and speed

Question 23

If the velocity and acceleration have the same signs then

Answer 23

It’s speeding up

Question 24

If the velocity and acceleration have diff signs then

Answer 24

Slowing down

Question 25

In gravity’s acceleration

Answer 25

(+) is down (-) is up

Question 26

Projectile motion is

Answer 26

Symmetrical motion

Question 27

In projectile motion Horizontal velocity is .

Answer 27

Constant

Question 28

In projectile motion Horizontal acceleration is

Answer 28

Zero

Question 29

In projectile motion vertical velocity?

Answer 29

Decreases in the way up, at max point = 0, increasing in the way down

Question 30

Vertical acceleration

Answer 30

G= 9.81 m/s^2
+g—> down
-g——> up

Question 31

Range is the ?

Answer 31

Horizontal distance

Question 32

Time of flight=

Answer 32

Time up + time down

Question 33

Horizontal distance(x)=

Answer 33

Vx. T

Question 34

Horizontal velocity (Vx)=

Answer 34

Vxi

Question 35

Vertical distance (y)

Answer 35

Vyi -gt

Question 36

Maximum Height (h) =

Answer 36

Vi^2 sin^2 theta/ 2g

Question 37

Horizontal range (R)=

Answer 37

Vi^2 sin(2 x theta)/ g

Question 38

Time of flight (t)

Answer 38

2vi sin theta / g

Question 39

Free fall happens due to?

Answer 39

Acceleration of gravity. Regardless of mass.
Up is -ve
Down is +ve
V=0 at max height

Question 40

Rational motion

Answer 40

Movement of an object around a point to form a circle.

Position is measures as difference in angle.

Question 41

Angular velocity

Answer 41

W= 🔺in theta/ 🔺in time or
W= 2pi/t
W=v/r

Question 42

Number of rotations

Answer 42

🔺in theta /2pi

Question 43

Angular acceleration

Answer 43

a= 🔺w/🔺t or 
a= w^2/r
a= 4pi^2 r/t^2 or 
a(angular)= a(linear)/r

Question 44

Centripetal force

Answer 44

Fc= m x v^2/r or
Fc= m x 4pi^2 x r/ t^2 
Fc= m x w^2/r

Question 45

Kepler’s law of planetary motion

Answer 45

1. The orbit of a planet is an ellipse with the sun at its focus.
2. The line segment joining a planet and the sun sweeps out equal areas during equal intervals of time.
3. The square of the orbital period of a planet i proportional to the cube of the semi-major axis of its orbit.