Physics

Question 1

The 7 fundamental quantities and their SI units

Answer 1

Length (meter), mass (kg), time (sec), electric current (ampere), temperature (K), amount of substance (mole), luminous intensity (candela)

Question 2

Quantities in science that do not depend on other quantities

Answer 2

Fundamental quantities

Question 3

Quantity having a magnitude only (ie. Distance, time, temperature)

Answer 3

Scalar quantity

Question 4

Quantity having both magnitude and direction (ie. Displacement, velocity, acceleration)

Answer 4

Vector quantity

Question 5

How to add vectors

Answer 5

Tail to tip method / Pythagorean theorem

Question 6

How to subtract vectors

Answer 6

Change direction of vector that is subtracted then perform addition

Question 7

How to multiply a vector by a scalar

Answer 7

Take that multiple of the vector; a negative scalar means reversing the direction of the resulting vector

Question 8

How to multiply a vector to obtain the dot product (formula), which is a ____ quantity

Answer 8

a⋅b = |a| |b| cosθ; scalar

Question 9

How to multiply a vector to cross the dot product (formula), which is a ____ quantity

Answer 9

a x b = |a| |b| sinθ; vector (direction obtained via right hand rule)

Question 10

Kinematic Equation 1 (velocity & time)

Answer 10

v = v0 + at

Question 11

Kinematic Equation 2 (position & time)

Answer 11

x = xo + vot + 1/2 at^2

Question 12

Kinematic Equation 3 (position & velocity)

Answer 12

v^2 = vo^2 + 2a(x-xo)

Question 13

Motion of a falling body under the influence of the earth’s gravity

Answer 13

Free Fall

Question 14

Motion of an object thrown or projected into the air, subject to only the acceleration of gravity

Answer 14

Projectile motion

Question 15

In projectile motion, the horizontal motion exhibits constant _____ and the vertical motion exhibits constant _______.

Answer 15

Velocity, acceleration

Question 16

Motion of an object following a circular path while moving at a constant speed

Answer 16

Uniform circular motion

Question 17

In UCM, acceleration and velocity have _____ magnitude and _____ direction.

Answer 17

Constant, changing

Question 18

Centripetal acceleration is pointed radially towards the ______ whereas instantaneous velocity points ________.

Answer 18

Center, tangentially

Question 19

Formula for centripetal force

Answer 19

Fc = mv^2 / r

Question 20

Trig function used when force is parallel to the ramp

Answer 20

Sin

Question 21

Trig function used when force is perpendicular to the ramp

Answer 21

Cos

Question 22

Tendency of things to resist change in motion

Answer 22

Inertia

Question 23

Measure of the inertia of an object; its amount of material

Answer 23

Mass

Question 24

Force experienced by a given mass due to gravitational attraction to the Earth

Answer 24

Weight

Question 25

Law of acceleration

Answer 25

F = ma

Question 26

While action and reaction forces are equal and oppositely directed, they don’t cancel each other when they are acting on (different/same) object/s.

Answer 26

Different

Question 27

Attractive force between two objects as a result of their masses

Answer 27

Gravity

Question 28

The law of UG that states that every particle attracts every other particle in the universe with a force that is directly proportional to _______ and inversely proportional to the _______.

Answer 28

Product of their masses, square of the distance between their centers

Question 29

Formula for Newton’s law of universal gravitation

Answer 29

F = G (m1m2/r^2), where G - gravitational constant, m - mass, r - distance