C hapter 12: G ravitation
12.1 Newton's Law of Gravitation
Weight t he force that attracts you toward the earth Newtons Law of Gravitation : Every particle or matter in the universe attracts every other particle with a force that is directly proportional
C hapte r 7: Potential E ne rgy and E ne rgy C onservat ion
7.1 Gravitational Potential Energy
A particle gains or loses kinetic energy because it interacts with other objects that exert forces on it. During any interaction, the change in a particle's k i
Height of a baseball from energy conservation You throw a 0.145-kg baseball straight up in the air, giving it an initial upward velocity of magnitude 20.0 m/s. Find how high it goes, ignoring air resistance. KE1+PE1=KE2+PE2 12mv12+mgh1=12mv22+mgh2 120.145
Chapter 6: Work and Kinetic Energy
6.1 Work
Work the amount of transferred by a force acting through a distance W=Fs Scalar quantity The total work done on a particle by all forces that act on it equals the change in its kinetic energya quantity thats rel
Work done by a constant force (a)Steve exerts a steady force of magnitude 210 N on a stalled car as he pushes it a distance of 18 m. The car also has a flat tire, so to make the car track straight Steve must push at an angle of 30 to the direction of moti
with it. he force.
Chapter 5: Applying Newtons Laws
5.1 Using Newton's First Law: Particles in Equilibrium
.
Equilibrium a body at rest or moving with constant velocity in an inertial frame of reference Ex. A hanging lamp, a suspension bridge, an airplane
C hapte r 4: New tons Laws of Mot ion
4.1 Force and I n teractions
Force a p ush or a pull; the interaction between two bodies or between a body and i ts environment Force is a vector quantity Contact force a force that involves direct contact between two
Chapter 3: Motion in Two or Three Dimensions
3.1 Position and Velocity Vectors
r=xi+yj+zk Average velocity (vav) displacement divided by the time interval Position vector ( r) a vector that goes from the origin of the coordinate system to the point P
vav
C hapter 2: M otion along a Straight L ine
2.1 Displacement, T ime, and Average Velocity
A useful way to describe the motion of the particle is in terms of the change in the particle's coordinate x over a time interval. Average velocity a vector quantity
Chapter 1: Units, Physical Quantities, and Vectors
1.3 Standards and Units
Unit Prefixes
1.5 Uncertainty and Significant Figures
Uncertainty/error the maximum difference there is likely to be between the measured value and the true value Accuracy how clo
Q UEST IONS 1. Calculate the kinetic energy in Joules of the pendulum with the ball embedded in it immediately after the impact. KE=12(M+m)V2 Heavier Pendulum Lighter Pendulum KE=120.2626 kg0.975 ms2=0.1248 J KE=120.3128 kg0.796 ms2=0.0991 J
Calculate the
C o lu m n 1 M +m (gm ) ab s. e rro r i n M +m (gm ) m (gm ) ab s. e rro r i n m (gm ) L (cm ) ab s. e rro r i n L (cm ) ( d e g) ab s. e rro r i n (d e g) h % e rro r i n L co s( +ab s) co s( -ab s) ab s. e rro r i n co s % e rro r i n co s % e rro r i n
QUESTIONS: 1. Make a summary table showing the results of your three trials in testing the law of conservation of energy. Included in this table should be: the approximate angle, the magnitude of the potential energy lost by the cart, the kinetic energy g
Experiment 3: Projection Motion
QUESTIONS 1. Which method do you believe to be more accurate for determining the initial velocity of the ball: the horizontal firing or the firing at an angle? Why? It is hard to tell which method is the most accurate since
QUESTIONS: 1. Why should the graph of velocity versus time for a falling plummet be a straight line? It should be a straight line because acceleration (the slope of the velocity versus time graph) is constant (about 980.23 cm/s2 in Schnecksville, PA). Why
C hapter 12 Homewor k
7. A typical adult human has a mass of about 70 kg. (a) What force does a full moon exert on such a human when it is directly overhead with i ts center 378,000 km away? FM=GmMmr2 =6.67 10-11 Nm2kg27.35 1022 kg(70 kg)3.78 108 m2 =2.40
Chapter 7 Homework
1. In one day, a 75-kg mountain climber ascends from the 1500-m level on a vertical cliff to the top at 2400 m. The next day, she descends from the top to the base of the cliff, which is at an elevation of 1350 m. What is her change in
Chapter 6 Homework
1. An old oaken bucket of mass 6.75 kg hangs in a well at the end of a rope. The rope passes over a frictionless pulley at the top of the well, and you pull horizontally on the end of the rope to raise the bucket slowly a distance of 4.
C hapter 5 Homework
4. An adventurous archaeologist crosses between
t wo rock cliffs by slowly going hand over hand along a rope stretched between the cliffs. He s tops to rest at the middle of the rope. The rope will break if the tension in i t exceeds 2
Chapter 4 Homework
9. A box rests on a frozen pond, which serves as a frictionless horizontal surface. If a fisherman applies a horizontal force with magnitude 48.0 N to the box and produces an acceleration of magnitude 3.00 m/s2, what is the mass of the
Chapter 3 Homework
9. A physics book slides off a horizontal tabletop with a
speed of 1.10 m/s. It strikes the floor in 0.350 s. Ignore air resistance. Find (a) the height of the tabletop above the floor y-y0=v0yt+12 ayt2 =0ms0.350 s+12 -9.80ms20.350 s2 =
Chapter 2 Homework
1. A rocket carrying a satellite is accelerating straight up from the earths surface. At 1.15 s after liftoff, the rocket clears the top of its launch platform, 63 m above the ground. After an additional 4.75 s, it is 1.00 km above the
C hapter 1 Homework
31. A postal
employee drives a delivery t ruck along the route shown. Determine the magnitude and direction of the resultant displacement by drawing a scale diagram.
R=7.8 km at 38 N of E
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35.
Compute the x- and y-compo