Week 3 notes-- Foces and Energy
Week 3 notes-- Foces and Energy PHYS 1750
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This 13 page Class Notes was uploaded by Emmanuel Ayanjoke on Saturday September 12, 2015. The Class Notes belongs to PHYS 1750 at University of Toledo taught by Dr. Lawrence Anderson in Fall 2015. Since its upload, it has received 144 views. For similar materials see Introduction to Physics in Physics 2 at University of Toledo.
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Date Created: 09/12/15
Farces application Definition of terms Equmb umz A 05333 is said 7 be in equiiibrium if it is not accelerated that is were is 0 WWW ing 9 H 5 WY directinn Le at the frames cancel out Tag for instance The two objects b81093 eath force acting at opposite directions out because they ar of the same magnitude r 50 N 3M4 5 3 32 523 n Jib thew 1m aajmm am at sgaitihriu 3mm that ne2 aw i g aww r the fangs am mt saga Extra stuff A body is said tan be in equilibrium when a the body as a whoie either remains at rest or moves in a straight tine with constant speedvelocity o the body is either not rotating at all or is rotating at a constant angular velocity Normal force N This is simply the force that prevents objects from felting thmugh Bath anther This prevents yamur from falling thmugh the table during c1355 It s 3350 tailed campression Tension The pulling force on a rope Tension is always uniform Friction is any force that opposes motion It could be static or kinetic Static friction means there s just enough opposing force to prevent the object from moving or sliding down a slope Pushing a box and it doesn39t move means static friction prevents it from moving Kinetic friction means the opposing force isn39t strong enough to prevent the object from moving Pushing a box and it moves but you feel on opposing force as it moves the opposing force is Kinetic friction Coefficient of friction is the amount of resistance that a surface exerts on another surface gliding on it 1 It does not depend on the slope ie the angle a It varies with nature of the surface 0 It does not depend on the mass of the object Examples solved in class 1 A sled weighs N It is held in place on a frictionless 30 slope by a rope attached to a stake at the top the rope is parallel to the slope Find the tension in the rope NW g a a We L 2quot t It t i Q t em 4 its a 1 t 9 l0 P Q r mtg m 35 LEO i 3 e em ll m i t if t w 2 A 35 kg box is sitting on a horizonfal floor If the box has a coef cienf of kinetic fric on of 045 wha r horizom al Tension is required To move if a r constant speed across The oor as L a WWWMWWA e 5 W 41 04539 x xg 8 Ob 3Q if m 3 e gm gee f fk m Q eg gt9 3S m 33 f 50 3 A 312 kg box sitting on a ramp has a coefficien of static friction of 021 If the ramp is raised a what angle will the box begin slipping kw re my new I W quotRpmiw bn Q4 4 mm Com 39gngg am Q wg DWHQO gm C how gm qOOW 35M 4amp5 K QQ FsUM 3 m e 2 g mampr bw omw1i z W WM 1 u Ham zgsw i MOJM 04 9651 Hob3 0equot E39L gao uar daur g ce Naquot dammw gg a mm m Quid l f TcN CQ 1 mm 2 aacgiawm i w 0x Lac await m N k c wm V 3 NQ JY h0 v23gy w f 2 FT 1053 F Nd anym aavm Wm 394 rt bw F TM wmw 3 nic cn N mm 40 JQ DUJ 28 ADULUE x 3 mdmgq Wafer m 01 mp8 N CV IF3 gtam mE th 9 pwUta E m mama a m a mm T 3 g PuLLe s T 764 1m Gk m 3 mad m3 HM quot2 3 CELT 51 MCQ ab gim rm m 2 S GpE g j 03 C03 3 3733 g h I C95 04 a X 2 8w C0304 W ung Cam QM W 4 T Q03 w 3 Qt thad ma o W 2 fan q Review questions and answers What is The normal force The force That prevents objects from falling Through each other What is friclion Any force Thm opposes mo on Wha r is The Typical formula for The force applied by sliding fric ri on mg Sin W What is in frth formula Mass What determines its value fundamental properties of The object Be able To set up and solve sliding fric on problems Whaf is fension The pulling force on a rope Be able To set up and solve Tension problems How do pulleys provide a lifting advan rage By multiplying The force applied Energy Definitian of terms Work An object is said to have done work if there is a displacement i in the direction of a force applied to it Work is a scalar quantity Le it cannot be described in terms of direction Therefore there is no such thing as the object did work towards direction Zquot SI unit is joules J or kngss Energy is the ability to do werk They both share the same SI unit and equal the same thing Energy is also a scalar quantity and its SI unit is Joules as well Kinetic Energy Energy possessed by a moving object Potential Energy This is a form of energy possessed by an object that has no velocity and is a certain height above ground level Note Both work and energy are incremental and accumulated overtime Therefore they are never expressed as negative integers 9 33 is wrong Examples solved in class 1 The Millennium Force roller coaster at Cedar Point has an initial drop of 914 m If there was no friction how fast would the coaster cars be moving at the bottom of the drop o d E9 23 E3 LookeeKiixfreismo kitchen v leptg t Q l mg Qd39 39 wt yam 2lt mews m gtlt 3 g 5quot H V 3 9 3 4 2 U V 426 arts 2 A 55 kg skier skis down a 21 slope starting at rest 25 m higher than the base The coefficient of friction is 005 Neglecting air resistance haw fast is he moving when he reaches the base at the slope 9 W O 4132 hm2 RQA 1H diggerquot Ma a Eeiege i 40quot 20 2 4 at M 5 5 X q g Q 4m quot5 5 4 1quot 27lt C0323 oil m are ya the Wm it 0 ghee week gee meet 719 J 2 gi c twinge KT Q 3 WEEK 3912 Vim U H710t g ygm g quot ewe x was 3 be 3 A railroad car with a mass of 19000 kg is rolling at 035 ms toward a bumper at the end of the track cansisting of a heavy spring with Spring constant 14000 N m How far does the spring compress when the car hits it Q1 MJ 0 Q m u E it v if r e I L V r 0amp5 m5 ex 2 39 lime Nm m a j 57 l1 x E K 133 7ifeales Recall work d a em a 95503 3quot Z3 Rage 9e 391 Elml lbfi 34quot CSMQ i m szK llesws Jodie ll vs Jquot gp 2 Mooo Arte 2 bolug pm I 962 2 exiles i0ee m 3 leeezg e 52quot f Review Questions and answers How is work defined in physics An object is said To have done work if there is a displacemen r T in The direc on of a force applied m if When net work is done on an object what happens The object moves a certain disfance in The direction of The force That acted on it Wha r is kinetic energy If is defined as The work needed To accelerate a body of a given mass from rest to its slated velocity Wha r is The SI unit of work and energy r Joules In fundamental SI units kngss Who is The work kinetic energy theorem and how is it applied It means ehange in work done by an object is equals To fhe change in Kinetic Energy Who is potential energy Energy possessed by an object dial is no in motion bu r at a cerfain height above ground level How much potential energy is added to an object if i is raised h m Mass gravity height 2 Potential energy e m 3 3 What is Hooke39s tat When an elastic object is stretched if exerts a force which returns if to i rs normal position Wha r are The unifs for The Spring consfanf k Nm How much paten d energy is stored in a spring compressed x cm 1 ix 2 Q How is conservation of mechanical energy expressed H quot ngvg 3 m h we Eh Under wha r conditions is mechanical energy onserved Only when objects are moving freely without friction
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