All quizzes
Complete The Following
1- A scientist called ........HOOKE................ discovered
a law for elastic materials.
2- If a material returns to its original size and shape
when you remove the forces stretching or deforming
it, we say that the material is
demonstrating.............ELASTIC ................
3- If deformation remains after the forces are
removed then it is a sign of....... INELASTIC ...............
4-When a system is in equilibrium, the resultant force
and the resultant turning effect is .........0..............
5- [Moment ] of a force is a measure of its
......TURNING EFFECT ........
6- In case of V Increases ,P.E .............DECREASE
.......AT GROUND = 0 .....
7- P.E at maximum height =........M.E ,
8- h= 10 m
g= 10 m/s2
K.E at GROUND = 400 j
M.E = ......400..........J
9- The ........SUN.............is the main source of E on the
Earth
10- m= 1000g
v= 2 km/h
K.E = ............ [0.154]............J
11-Moment of a force = FORCE X
……….[perpendicular distance] from pivot to force
12-A block of mass 10 kg is suspended at a distance
of 20 cm from the center of a uniform bar 1 m long.
What force is required to balance it at its center of
gravity[ middle] by applying the force at the other
end of the bar? .........40.........N
13-A nut has been tightened by a force of 200 N
using 10 cm long spanner. What length of a spanner
is required to loosen the same nut with 150 N
force?.........13.3............cm
14-What force must applied to a 30 cm long spanner
to generate a moment of 6.0 Nm?..........20..............N
15- The main source of E above the earth is
………SUN……
16- Solar cells produce .........ELECTRIC E.............
17- …V2……….= [ 2K.E /m ]
18- in case of height increases ,......K.E OR VELOCITY
..........[decreases]
COMPLETE
1- When an object is in EQUILIBRIUM, ………
[Total left moment = total right moment]
2 – In the 2 following cases; complete the statement
using 2 options; equilibrium or nonequilibrium.
A-There is a bar its length d (cm) , around its pivot
,there are 2 forces; F1 = 10 N , 1/3 d from pivot
F2 = 20 N , 2/3d from pivot
So the bar in - ……NO equilibrium
B-Suppose d1 = 1 cm, mass = 25 g, d2 = 10 cm, mass
= 2.5 g , So the rigid bar in ……equilibrium …………..
3- ……Pa………….. is the unit of PRESSURE
4- ……p……. = [density x height x gravity ]
5- The increase in length of a spring when a load is
attached is ........extention ............
6- …force……. = [K x ]
7- force = pressure x ...area ..................
8- in case of running of water from high dam ,
.............k.e ......... increase .
9 - in case of moving an object up until
reaching maximum ……height or P.E.... Increase .
10- P.E + K.E = ..........constant = M.E ..............
11- the moment if a force of 2 N is applied to a
spanner 500 cm long …1000 Ncm= 10Nm………….
12- Electric lamp supplied by 100 j that produce 10 j
as light and 90 j as heat , its efficiency …
10 /100 x [100 % ]= 10 % …
[ explain conservation of E]
10 + 90 = 100 Ein = Eout
Put "True" or "False"
1- Change of height = 300 cm
weight = 1000 N ,
Gain in G.P.E = [3000] j. T
2- M.E = [P.E+ K.E].T
3- Nuclear E= E stored in the NUCLEUS. T
4- conversion of E isnot related to [conservation of E]
Due to [E] cannot created nor destroyed . F
5- Total E [ Before] = [Total E [ after] in any E
conversion T
6- in electric bulb , electrical E Is changed to [light &
heat]. T
7- Solar cells convert sound E into electric E. F
8- The following picture represents imbalance state. F
9- E travelling in the form of waves = [EMW]. T
10- The E of moving object = [P.E].F
11- in solar cells ,[Light E] changed to electrical E .T
12- E = Capacity to do [work] T
13- more area = more pressure F
14- more weight , less pressure . F
15- Pa = [N / m]. F
16- E against gravity = [G.P.E]. T
17- Total E [Before] = Total E [after] in any E
conversion.T
18- L0 = 10 cm
stretched and becomes = 13 cm
m = 3 kg , g = 10 m/s2
K = 10 N /cm T
19- P.E = 6000 J at maximum height m= 10000 g
h= 10 m g= 10 m/S2
K.E = 6 kj
F
20-N / m2 is unit of pressure. T
Complete
1- F/ P =...........A..........
2- ……m…… = density x V
3- N / m2 =.....Pa.................
4- ……P………..= density x height x gravity
5- The measuring tool of pressure is
.........Manometer................
6- Force = 1000N
width= 5m
Length= 10000 cm
pressure =.....1000/ 500=2..................pa
7-The further away …......F........... is from the Centre,
the greater the turning effect.
8- kg m / S2 = .........N................
9- ……J…. = [N m ]
10-The ........Moment.......... of a force is a measure of
its tendency to cause a body to rotate about a
specific point or axis.
11-The unit of moment is ..............Nm....................
12-The ............center of mass................ = the actual
fixed point about which the force causes rotation.
13-A force of 40 N is applied to a spanner to turn a
nut. The perpendicular distance is 30 cm. Calculate
the moment of the force.
M= ........12..................Nm
14- For the following picture
M= ………5………..Nm
15-In the following picture [ Equilibrium state ]
F= …………10…………N
16- Light nuclei gives new heavy nucleus in case of
……………….nuclear fusion.
17- ……fossil…. Fuel Comes from long dead materials
18-……solar cells……Change solar E to electricity
19- Wood is example of …biomass…….. Fuel.
20- K.E in case of speed = 40 m/s for the
following graph= ……1600……….Kj
Complete the following statements
1- …m……… =P.E / gh
2- ……p.e………….. = [M.E - K.E ]
3- The sun produce ......heat.......... + ……light…......
4- the output of T.V =........sound + light.......
5- in case of electric bell , the output is
.....sound..............
6- the E related to solar cell ........light E................
7 - conversion of E is related to
......CONSERVATION................ of E.
All equations
F= KX [ N]
K = F/X [ N/m]
X = length after extension – starting length
P = F / A [ N/m2] or [ Pa]
P = height x density x gravity
M= F d [ N m]
[Moment] left = [moment] right
F1 d1 = f2 d2 [equilibrium condition]
First force x its arm = second force x its arm
M.E = P.E + K.E = CONSTANT
K.E = M.E – P.E = M.E at ground
P.E =M.E – K.E = M.E at maximum height
K.E = 0 at maximum height
P.E = 0 at the ground
P.E = K.E = M.E /2 [ at middle height]
K.E = 1/2 m v2 [ j= kg m2 / s2 ]
V2 = 2 K.E / m [j / kg =Nm/ kg = m2/ s2 ]
P.E = m g h [j = N m]
m= p.e / g h [Kg]
More P.E, Less K.E [ reverse relation]
E input = E output [conservation E]
Efficiency = E out useful / Ein 100%
________________________________
1-Explain how the following E resources
depend on solar E
a-Biomass fuel as wood.
TREE as plant make its food using sun light
via photosynthesis .
Without sunlight, no wood obtained.
b- Electricity from hydroelectric power
station. Sunlight cause evaporation,
producing clouds, falling of rain, storage
behind high dam, K.E changed to electrical E
using turbines …..
calculate
1-An mass-10kg block is released from the top of the
smooth inclined plane [ h= 9 m] , as shown in the figure below.
Calculate GPE of the block at point M & its K.E at the top of
plane
P.E= mgh = 10 10 3 = 300 j
k.e= 0
.
2-An object start to sliding from a point of A without the initial
velocity. If there is no friction force, what is the M.E of the object at
the MAXIMUM point. Mass= 2 kg
M.E = P.E + K.E = 2 X 10 X 20 + 0= 400 J
1- E = .......[Ability to do work ].........
2- ability to make a change = ...[E ].............
3- E against gravity = ...........[G.P.E ]............
4- E travelling in the form of waves = ..............[EMW ]...........
5- The E of moving object = .......[K.E ]........
6- Pa = .........[N / m2].............
7- F = .........[P A ]............
8- ............[manometer ].................MEASURING TOOL OF PRESSURE
1- P.E = ...............[mgh]................
2- K.E = ........[1/2 mv2].......
3- Internal E = .............[P.E + K.E]............
4- .....[nuclear E]...........IS E stored in the nucleus.
5- ..........[Electrical E]...................Transferred by an electric current.
6- LIGHT E Is Transferred in the form of ..........[visible radiation]..................
7- IN running case , ...................[chemical E].... is changed into kinetic E.
8- IN CASE OF electric lamp .
electric E is changed into ...................[light E]...................
1- ......[force]..........can change shape & size of solid object.
2- silver is ........[Soft metal].........at R.T.
3- Hooke's law, law of .........[elasticity].............. discovered by the English scientist
....[Robert Hooke].......
4- if material do not return back to its original length , ........[inelastically
deformed]................
5- force = 10 N
, K = 20 N/ cm
extension = ........... [0.5 cm ]..............
6- rubber don't obey ..........[hooke law].........
7-.....[ A manometer].......... = device is used to measure pressure difference between 2
points.
8- ...........[barometer]...........Can be used to measure atmospheric pressure .
1- Mathematical law of Hooke’s Law =.......[F = k ∆ x]..........
2- If a material returns to its original size and shape when you remove the forces
stretching or deforming it (reversible deformation), we say that the material is
demonstrating .......[elastic behavior]..............
3-A ..........[inelastic material]........is one that stays deformed after you have taken the
force away. If deformation remains (irreversible deformation) after the forces are
removed then it is a sign of plastic behavior.
4- Hooke discovered that the amount a spring stretches is proportional to..........[the
amount of force applied to it.].................
This means if you double the force its extension will ..........[double]......, if you triple the
force the extension will triple and so on.
6- x is the ...........[extension]............. (in meters)
7- k is the ....................[spring constant]........................ (in N/m).
8- ∆x = stretched length – ........[original length.]........
1- force = 100N
A= 100 m2
2- pressure =
1000 pa
3- mass = 1000 g
...... [100 Pa]......
pressure = ........ [1 pa]....................
area = 1 m2
force = ..... [1000N].................
acceleration = 100 m/s2
area = 1m2
pressure =
4- If You are holding a 2000000 mg book in the palm of your hand and if the area of
contact between your hand and the book is 0.003 m^2 then find out the pressure
that is exerted on your hand by the book...........[6533.3 pa]........pa
5- P = .....[density x height x gravity]...........
6- more deep in the sea = ....[more pressure]............
7- more ........[thickness]........ at bottom of the dam
8- the measuring tool of pressure is .......[manometer]............
9- the measuring unit of pressure is.....[pa]............
1-The further away ......[FORCE]........... is from the centre, the
greater the turning effect............
2-The units of moment are (.......[Nm]............).
3-The .......[Moment]........... of a force is a measure of its tendency
to cause a body to rotate about a specific point or axis.
4-The ..........[Center of Moment]....... = the actual fixed point
about which the force causes rotation.
5-A force of 40 N is applied to a spanner to turn a nut. The
perpendicular distance is 30 cm. Calculate the moment of the
force.
M= ..............[12]............Nm
6-A parent and child are at opposite ends of a playground seesaw. The parent weighs 750 N and the child weighs 250 N. The
child sits 2.4 m from the pivot. Calculate the distance the parent
must sit from the pivot for the see-saw to be balanced.
d= .......[0.8]............m
Complete
1- When an object is in ................................ , total clockwise
moment = total anticlockwise moment.
2-there is a bar its length d m , around its pivot
object 1 its mass = 10 kg , 1/3 d from pivot
object 2 its mass = 20 kg , 2/3d from pivot
the bar in
equilibrium or nonequilibrium ?????
3-Calculate the moment if a force of 5.0 N is applied to a spanner 15 cm long.
4-Suppose d1 = 20 cm, w1 = mass of 25 g, d2 = 10 cm, w2 = mass of 50 g ,
choose
balance
no balance
1- moment of a force is a measure of its .....[turning effect].................
2-When a system is in equilibrium, the resultant force and the resultant
turning effect is ..........[zero].............
3-Moment of a force = force × ......[perpendicular distance from pivot to
force]....................
4-A block of mass 10 kg is suspended at a distance of 20 cm from the
center of a uniform bar 1 m long. What force is required to balance it at
its center of gravity[ middle] by applying the force at the other end of
the bar? ........[40]...........N
5-A nut has been tightened by a force of 200 N using 10 cm long
spanner. What length of a spanner is required to loosen the same nut
with 150 N force?.............[13.3]....cm
6-What force must applied to a 30 cm long spanner to generate a
moment of 6.0 Nm?...........[20]..........N
1- Pa is the unit of ...........[P]...........
2- pressure = ............[density x height x gravity ]...................
3- the increase in length of a spring when a load is attached is ........[extension ]............
4- F = ................[K x ]..........
5- force = pressure x .........[area ]............
6- in case of running of water from high dam , ..........[K.E increase ]..............
7 - in case of moving an object up until reaching maximum height , ..........[P.E
Increase ]............
8- P.E + K.E = ...........[Constant ].............
1- in case of V Increases , ...........[P.E decreases]...............
2- P.E at maximum height =..........[M.E ].............
3- m= 1000 g
........[400 ]........J
g= 10 m/s2
h= 10
K.E at GROUND = 400 j
4- The .......[Sun]...............is the main source of E on the Earth
5- m= 1000g
v= 2 km/h
K.E = ............ [0.154]............J
6- Solar cells produce .........[electric E]...............
7- V2=...............[ 2K.E /m ].........
8- in case of height increases ,...........[K.E decreases]..........
complete
1- conversion of E is related to .........[conservation of E].............
2- ............[E].................. cannot created nor destroyed .
3- Total E [ Before] = .........[Total E [ after]]................ in any E conversion
4- in electric bulb , electrical E Is changed to .......[light & heat].............
5- in solar cells , .........[Light E]............ changed to electrical E .
6- E = Capacity to do .............[work]........
7- more area = ..........[less pressure ]...........
8- more weight , ......[more pressure ]................
1- F/ P =.........[A ].............
2- Pa is unit of .............[P]........
3- Mass = ......[density x V ].............
4- N / m2 =.........[pa ]..............
6- kg m / S2 = ..........[N]...............
7- J = .......[N m ].............
8- p = ...............[h density g ].............
M.E =