8Th Grade Physics Science Final Exam

Front 1

Electric force depends on what2 things

Back 1

type of charge and distance

Front 2

T/F The size of the elctric force increases as the amount of charge increases

Back 2

true

Front 3

explain what is happening to your hair when you touch a Van de Graf generator

Back 3

The hairs stand up since all hair has the same charge and they repel against eachother and the hair becomes negetively charged

Front 4

if you run your hair with a balloon does your hair gain an electric current or a static electric charge

Back 4

static electric charge

Front 5

what is the purpose of an electric motor

Back 5

to convert electrical energy to mechanical enery

Front 6

what is the job of a transformer

Back 6

to increasee/decrease voltage

Front 7

define current

Back 7

amperes when volts is divided the resistance of the flow of electrity. Amount of charge passing through a specific point

Front 8

what is resistance caused by

Back 8

resistance is caused by internal friction which slows down the movement of charges
Length, Temperature and type of material

Front 9

as the distance from a magnet increases, what happens to its magnetic field strength

Back 9

inversely proportional-magnetic field decrease

Front 10

name three 'places' magnetic fields can exist

Back 10

near a magnet
on a magnet (within the magnet)
farther away from a magnet`

Front 11

explain the differencer between an open and closed circuit

Back 11

open- current interuppted
closed- current flows

Front 12

a streched spring posses what type of energy

Back 12

elastic potential

Front 13

a moving car posses what type of energy

Back 13

kinetic energy

Front 14

plants convert what type of energy to what other form of energy

Back 14

solar (light) to chemical

Front 15

a swinging pendulm has what two forms of energy

Back 15

potential and kinectic

Front 16

ceiling fan

Back 16

converts electrical energy into motion

Front 17

generator

Back 17

converts mechanical enegy into electrical

Front 18

bob works at his desk for 3 hours wreiting a report for his history class. Joe carries a 25 pund television up 2 flights of stairs in 6 minutes. Who did more work?

Back 18

Joe did more work. Taking the tv upstairs is more work. Bob is not doing any work and Joe is doing work that can be

Front 19

shopper 1, pushes a grocery cart by exerting a force of 40 N a distance of 4.0m. Another shopper, shopper 2, then moves a different cart with only 20 N of force a distance of 8.0m. Who did more work shopper 1 or shopper 2

Back 19

they did the same amount of work

Front 20

explain how a windmill transfers energy to generate electrity

Back 20

wind blows-->wind spins-->generator spins-->electrcity produced

Front 21

explain the type of energy transformation that takes place through the process of photosynthesis

Back 21

Plants take in solar (light/sun) energy is converted to chemical energy

Front 22

you are bored and watching the clock. You realize that there is an energy conversion taking place. WHat is it?

Back 22

The kinetic energy turning into potential energy and turning back.

Front 23

T/F Electrical current always flows from an area of low potential energy to high potential energy

Back 23

False, from high to high

Front 24

what is resistance caused by

Back 24

length, temperature and material type

Front 25

T/F Potential differences cause electrons to move from the positive to the negetive terminal

Back 25

False, Electrons move from the negetive to positive terminal

Front 26

as the distance from a magnet increases, what happens to s magnetic field strength

Back 26

inversely proportional-magnetic field decrease

Front 27

explain the difference between and open and closed circuit

Back 27

open-currents interuppted
closed-current flows

Front 28

mary and kate are pusing on a cart. mary pushes north wrh 30 N and Kate pushes south with 30 N. which way will the cart move

Back 28

the cart will not move

Front 29

calculate the net force on a box if it is being pushed east with 25 N and west with 36 N

Back 29

11 N west

Front 30

when you sit on the ground what is the reaction force

Back 30

the force if thr ground on you

Front 31

when a mosquito flies through the air with constant velocity, what force is acting on it

Back 31

gravity, kinetic friction and air resistance/fluid friction

Front 32

calculate the eed of a 3000 lb vechicle that travels 360km in 6hrs.

Back 32

60 km/hr

Front 33

what is the acceleration of a foward moving object if it takes 25 seconds to accelerate from 175 meter/second ti 250 meters/second

Back 33

3 m/s/s foward

Front 34

an object is being pulled with a force of 21 N foward. The object has a mass of 7kg, whar us thr objects acceleration

Back 34

3 m/s/s forward

Front 35

an object is pushed with 10 N at an acceleration rate of 5 m/s/s foward. what is the object's mass?

Back 35

2 kg

Front 36

T/F A child riding on a merry go round is being acted on by a cebtripetal force

Back 36

true

Front 37

T/F as the distance between two objects increases, the gravitational force decreases

Back 37

true

Front 38

T/F free all due to gravity and the foward motion of a sarellite forms the orbit of a satellite

Back 38

true

Front 39

T/F an object can accelerate without chnaging its speed

Back 39

true

Front 40

T/F friction acts on an object in the smae direction as the object is moving

Back 40

false

Front 41

T/F mass is affected by gravity

Back 41

false

Front 42

T/F Standing a a planet has less mass than earth would decrease a persons weight

Back 42

true

Front 43

two main outside forces act on most anything on earth are

Back 43

friction and gravity

Front 44

T/F periodic motion is when the motion of an object repeats itself

Back 44

true

Front 45

one dimensional

Back 45

scalar
distance- 35m
speed- 35mph

Front 46

two dimensional

Back 46

Vector
displacement- 3m South
Velocity- 35 mph south
acceleration- 3 m/s/s foward

Front 47

if you are pushing a box on a table to the right, in what direction is the force of friction going

Back 47

left

Front 48

the law of universal gravitation states that

Back 48

object always exert gravitational forces on each other
the force of gravity depends on the mass and the distance between two objects

Front 49

using the universal law of gravitation when applied to earth, what happens to the force of gravity as an object is moved from sea level to the top of the highest mountain

Back 49

the gravitational forve decreases by alot the stance increases