Week 1

Question 1

nano

Answer 1

n
10^-9

Question 2

micro

Answer 2

μ
10^-6

Question 3

mili

Answer 3

10^-3

Question 4

kilo

Answer 4

k

10³

Question 5

mega

Answer 5

M
10⁶

Question 6

giga

Answer 6

G
10⁹

Question 7

accuracy

Answer 7

how close a given measurement to a given standard

Question 8

precision

Answer 8

reproducibility of a measurement, not necessarily related to the accuracy

Question 9

Newton’s 1st Law:

Answer 9

Any object continues at rest, or at constant velocity, unless an external F acts on it

essentially, F is anything that is measurable and causes a change in the motion of an object

Question 10

Newton’s 2nd Law:

Answer 10

External force gives an object an acceleration. The acceleration produced is proportional to the force applied, and the constant of proportionality is the mass.

F=mα
N = kg*m/s^2

Question 11

Newton’s 3rd Law:

Answer 11

Fs come in pairs: f/ every F applied TO the body, there is a F applied BY that body
!action F & reaction F are acting on diff objects!

Question 12

friction -

Answer 12

F directed along the surface, opposite the direction of the intended motion

Question 13

Normal F

Answer 13

perpendicular component of the contact Force b/w 2 objects in physical contact w/ each other

Question 14

statics

Answer 14

study of F in equilibrium, study of bodies which are not moving

Question 15

positive torque -

Answer 15

motion in counter-clockwise direction (ccw)

Question 16

negative torque -

Answer 16

motion in clockwise direction (cw)

Question 17

a system is said to be in equilibrium when:

Answer 17

net F of that system is 0 and net torque of the system is 0

Question 18

stable equilibrium:

Answer 18

system will return to equilibrium after a small displacement

Question 19

unstable equilibrium

Answer 19

system will not return to equilibrium after a small displacement

Question 20

for a system in static equilibrium all torques:

Answer 20

are balanced => no net torque

Question 21

Principle of moments:

Answer 21

at equilibrium the sum of cw moments = ccw moments
ΣFcwdcw = ΣFccwdccw

Question 22

1st class lever:

Answer 22

fulcrum in the middle, Work/Load & Force act on opposite sides in the same direction

Question 23

2nd class lever

Answer 23

W(load) in the middle

ex: standing on tip toes

Question 24

3rd class lever

Answer 24

F(muscle effort) in the middle

Question 25

distance an object travels -

Answer 25

length of the path that the object took in traveling from one place to another, scalar

Question 26

Displacement

Answer 26

s the distance travelled, but with a direction associated, vector

Question 27

average velocity

Answer 27

displacement divided by the elapsed time, vector

Question 28

Acceleration

Answer 28

how rapidly the velocity of an object is changing, defined as the change in velocity divided by the time taken to make this change, vector

Question 29

Is torque a force?

Answer 29

No, it's a moment

Question 30

torque -

Answer 30

physical quantity which causes an object to begin to rotate or move in a circle or to change its rate of rotation

Question 31

The amount of turning produced by the force applied to a rod will depend

Answer 31

* on the magnitude of the force (F) and * the length of the rod (d) 𝝉 = 𝐅d

Question 32

centre of gravity -

Answer 32

a point where all weight of an object acts

Question 33

centre of mass

Answer 33

point at which the total mass of a body may be considered to be concentrated (for many purposes) in analysing its motion