* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download m/s - Egyptian Language School
Theoretical and experimental justification for the Schrödinger equation wikipedia , lookup
Eigenstate thermalization hypothesis wikipedia , lookup
Modified Newtonian dynamics wikipedia , lookup
Fictitious force wikipedia , lookup
Internal energy wikipedia , lookup
Brownian motion wikipedia , lookup
Density of states wikipedia , lookup
Jerk (physics) wikipedia , lookup
Matter wave wikipedia , lookup
Center of mass wikipedia , lookup
Velocity-addition formula wikipedia , lookup
Work (thermodynamics) wikipedia , lookup
Classical mechanics wikipedia , lookup
Specific impulse wikipedia , lookup
Electromagnetic mass wikipedia , lookup
Rigid body dynamics wikipedia , lookup
Kinetic energy wikipedia , lookup
Equations of motion wikipedia , lookup
Hunting oscillation wikipedia , lookup
Newton's laws of motion wikipedia , lookup
Seismometer wikipedia , lookup
Classical central-force problem wikipedia , lookup
Egyptian Language School Science Department Physics 1st Sec. Physics Revision sheet for first sec . 1. Match the following physical quantities with its unit: Physical quantity 1. Displacement. 2. Temperature. 3. Work. 4. Gravitational constant. 5. Density. 6. Force. 7. Acceleration. 8. Mass. 9. Kinetic energy. Unit a. Kelvin. b. Joule. c. Kg.m/𝑠𝑒𝑐 2 d. N.m2.Kg-2 e. Kg/m3 f. N g. m/s2 h. meter i. Kg j. N.m 2. Compare between: a. Periodic and translational motion b-uniform and variable velocity c. Potential and kinetic energy 3. Complete: 1- ……………………… is equal to 1/86400 of the average solar day. 2-From uses of satellites …………………..and……………………… 3-Energy is a …………………… quantity ,while force is ………………………. Quantity. 4- The ratio between potential and kinetic energies at the midpoint of fall equals …………….. 5-the kinetic energy of an object is 4 J. The kinetic energy if its speed is doubled equals ……………….. 6-energy is neither created nor destroyed but changes from one form to another is the law of …………………………………………………………………………….. 7-the work done by a force of 1 Newton to move an object through a displacement of one meter in the direction of force is ……………………….. 4-Complete the table The physical quantity Relation to other quantities work Force × displacement Joule Mass×velocity Kg.m/s Density (ρ) Mass/volume Kg/m3 Speed (v) Distance/ time Unit L / T = LT-1 LT-1 /T = LT-2 Acceleration (a) Force (F) Dimensional formula m/s2 Mass x acceleration N 5- Solve the following problems: 1- A student measured the length of a pencil. It was found 13.9 cm, meanwhile its actual length is 14cm. Estimate both the absolute error and relative error. (0.1,0.7%) 2- A car of mass 1 ton starts motion from rest with uniform acceleration of 2 m/s2. Find its kinetic energy: a- Before it starts motion b- After 10 sec. 3- A body is projected upwards; it reaches the max height after 3 sec. find max height reached.(g=10m/s2) 4- An object of mass 5Kg falls freely from 10m high above the ground. Find its kinetic energy when it becomes at 3m high above the ground given that free fall acc =10 m/s2 5- An object of mass 50Kg has accelerated from rest till its velocity becomes 5m/s after 5 seconds .find the work done. 6- A crane pulls a car with a force 3000N to accelerate it at 3m/s 2 find the mass and weight of the car. Good Luck Model answers of revision sheet 1(1, h) - (2, a) - ( 3 , j) - (4 ,d ) - (5 , e ) – (6 , f and c) - (7 , g) - ( 8 , I ) - (9 , b) 2a-Periodic motion -Motion repeats itself at equal intervals of time. -examples :circular motion and vibrational motion Translational motion -motion which is characterized by having a starting and end point. -examples: motion in a straight line (car or train) b- Uniform velocity -The velocity in which the object moves through equal displacements in equal intervals of time. -show by graph c-Kinetic energy -Energy gained by an object due to its motion -depends on weight and height 3- Variable velocity -the velocity in which the object moves through unequal displacement in equal intervals of time -show by graph Potential energy Energy stored in an object due to its position -depends on mass and velocity 1-the standard second 4- 1:1 5- 16 J 2- Spying and communication 3-scalar - vector 6-Law of conservation of energy 7- joule 4The physical quantity Relation to other quantities Dimensional formula Unit work Force × displacement M.L2.T -2 Joule Momentum Mass × velocity M.L.T-1 Kg.m/s Density (ρ) Mass/volume Speed (v) Distance/ time Acceleration (a) Force (F) Velocity/time Mass x acceleration -3 M.L L / T = LT-1 LT-1 /T = LT-2 M.L/T-2 Kg/m3 m/s m/s2 N 51- Absolute error = 14-13.9 = 0.1 Relative error =0.1/14 =0.007 =0.7% 2- m= 1ton =1000Kg vi =0 a= 2m/s2 a-before it starts motion v=0 then kinetic energy =0 b- after 10 seconds vf =vi + at vf= 0+2×10 v=20m/s K.E.=1/2mv2 K.E.= 1/2×1000×202 K.E.=200000 joule g= -10m/s2 3- at max height vf=0 Vf= vi +at 0 = vi + (-10)×3 d=vit +1/2gt2 t=3 s vi=30 m/s d=30×3 +1/2 ×(-10)32 4-m=5Kg weight =5×10 =50N d=45 m h=10m At the highest point M.E. = P.E. P.E.=W× h P.E. =50×10 =500N M.E.=500N AT 3m height M.E.=P.E +K.E. 5- m= 50Kg P.E. =3×50 =150 J vi=0 vf=5m/s t=5 s d= vit +1/2 a t2 W=F × d F=m×a a=vf-vi/t a=5-0/5 a=1 m/s2 F=m.a F=50× 1=50 N d=0+0.5×1×52 d=12.5 m W=F × d =50 ×12.5 = 625 Joule 6-F=3000N a=3m/s2 m=F/a m=1000Kg W= m×g =1000×10 = 10000 joule K.E.= 500-150 =350 J