Finals sem. 1

Question 1

What is gravity?

Answer 1

universal force that causes attraction between everything in the universe

Question 2

Gravity is a weak or strong force?

Answer 2

Weak

Question 3

What is inverse square law

Answer 3

The force of gravity weakens based on the inverse square distance between the 2 objects

Question 4

Equation for gravity?

Answer 4

G = 6.67 X 10^-11

Question 5

equation for mechanical advantage

Answer 5

output force/input force

Question 6

machine’s mechanical advantage is..?

Answer 6

the number of times a machine increases a force exerted on it

Question 7

3 ways machines make work easier?

Answer 7

increasing force, increasing distance. changing direction

Question 8

Why is work wasted in every single machine?

Answer 8

Because of friction

Question 9

Equation for mechanical efficiency?

Answer 9

output/input x 100%

Question 10

efficiency is always expressed in what unit

Answer 10

percentage

Question 11

6 types of simple machines

Answer 11

lever
pulley
inclined plane
wheel & axle
wedge 
screw

Question 12

Unit for work & energy

Answer 12

joules

Question 13

the greater the mass, the (greater or less?) the kinetic energy

Answer 13

greater

Question 14

Equation for kinetic energy + unit answered

Answer 14

KE= 1/2 x mass x velocity ^ 2

Question 15

a screw is a modified what?

Answer 15

incline plane

Question 16

Where is a chemical energy found?

Answer 16

in the bonds of matter

Question 17

mechanical energy is split in 2 types of energy.. what are those 2 energies

Answer 17

Kinetic & potential

Question 18

which energy transfer is the most frequent

Answer 18

thermal energy

Question 19

electromagnetic is split in 2 types of energy.. what are those 2 energies?

Answer 19

light & electricity

Question 20

What is an electric charge?

Answer 20

property that causes subatomic particles to attract or repel each other

Question 21

electric force

Answer 21

the force of attraction or repulsion between electrically charged objects

Question 22

electric field

Answer 22

the effect an electric charge has on other charges in the space around

Question 23

static electricity

Answer 23

study of the behavior of electric charges

Question 24

induction

Answer 24

transfer of charge w/out contact between materials

Question 25

electric current

Answer 25

continous flow of electric charge

Question 26

direct current

Answer 26

charge flows in one direction

Question 27

alternating current

Answer 27

charge that regularly reverses its direction

Question 28

conductor

Answer 28

material which charge flows easily

Question 29

insulator

Answer 29

material which charge cannot flow easily

Question 30

resistance

Answer 30

opposition to the flow of charges

Question 31

superconductor

Answer 31

material that has almost 0 resistance when cooled to low temps

Question 32

example of superconductor

Answer 32

copper

Question 33

potential difference

Answer 33

difference in electric potential energy between 2 places in an electric field

Question 34

voltage

Answer 34

potential difference

Question 35

electric circuit

Answer 35

complete path through which charge can flow

Question 36

series circuit

Answer 36

charge only has one path through which it can flow

Question 37

parallel circuit

Answer 37

charge has multiple paths through it can flow

Question 38

what is an atom?

Answer 38

building blocks of matter

Question 39

what is an atom made of

Answer 39

protons + electrons

Question 40

extra e''

Answer 40

negative charge

Question 41

removing e''

Answer 41

positive chargeq

Question 42

what is static electricity made of?

Answer 42

buildup of surface electrons

Question 43

static electricity is what type of energy

Answer 43

potential

Question 44

how to discharge/move electrons in static electricity (3 ways)

Answer 44

1. friction/rubbing 2 surfaces together 2. conduction/ 2 touching surfaces 3. induction through electrical field

Question 45

what is electric current measured in

Answer 45

amps

Question 46

what is electric currents controlled by

Answer 46

circuits

Question 47

what is resistance measured in

Answer 47

ohms

Question 48

what is a volt?

Answer 48

amount of energy in a current

Question 49

what is potential difference

Answer 49

how electric charges flow through a conductor

Question 50

electric potential = ?

Answer 50

voltage

Question 51

what is electric potential measured in?

Answer 51

volts

Question 52

what is coulombs law similar to?

Answer 52

universal gravitation

Question 53

current measured in?

Answer 53

amperes

Question 54

what is ohms law?

Answer 54

relationship between current, voltage & resistance

Question 55

what is the equation for current

Answer 55

A = voltage/resistance

Question 56

more resistance in what types of wire?

Answer 56

longer & thicker wires

Question 57

accelerattion due to gravity on earth?

Answer 57

9.8 m/s^2

Question 58

what two forces are both attractive? a. gravity b. ohms laws c. voltage d. electrical force

Answer 58

a & d

Question 59

ampere = ?

Answer 59

electric current

Question 60

voltage = ?

Answer 60

electric potential

Question 61

coulomb = ?

Answer 61

electric charge

Question 62

ohm =?

Answer 62

electric resistance (to flow)

Question 63

Equation for force + unit answered

Answer 63

Force = mass x acceleration, Newtons

Question 64

Equation for momentum + unit answered

Answer 64

momentum = mass x velocity, momentum

Question 65

What unit for mechanical advantage?

Answer 65

no unit

Question 66

Equation for work + unit answered

Answer 66

work = force x distance, Joules

Question 67

Equation for power + unit answered

Answer 67

power = work/time, watts

Question 68

Equation for gravitation potential energy + unit answered

Answer 68

gpe = mass x acceleration due to gravity (9.8 m/s^2) x height, no unit