# General Physics I. Lecture 7: The Law of Gravity. Prof. WAN, Xin 万歆.

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1 General Physics I Lecture 7: The Law of Gravity Prof. WAN, Xin 万歆

2 Outline Newton's law of universal gravitation Motion of the planets; Kepler's laws Measuring the gravitational constant Free-fall acceleration Satellite motion Rocket propulsion

3 Newton's Law of Universal Gravitation Observations known to Newton: Apples fall from trees to the ground. Moon circles around the earth. Planets moves around the sun. Newton's unified heavenly and earthly motions. Every particle in the Universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

4 Newton's Thought Experiment Earth RM

5 The Linear Dependence on Mass Near the surface of the earth, we know F = mg. If this force is governed by the same law of gravity, the universal gravition must be proportional to the mass of the object. F g m Because of Newton's third law, if the force is proportional to the mass of one object, it must be also proportional to the mass of the other object. F g m1 m2

6 The Inverse-Square Law Question: Based on the knowledge Newton might have, what observation can he used to support his law? Motion of planets? Prove that the square of the orbital period of any planet is proportional to the cube of the radius of the circular orbit discovered by Johannes Kepler.

7 The Inverse-Square Law Question: Based on the knowledge Newton might have, what observation can he used to support his law? 2 Motion of planets 2π R v = T v GMm m = 2 R R T 2 2 4π R = GM 3 The square of the orbital period of any planet is proportional to the cube of the radius of the circular orbit discovered by Johannes Kepler.

8 Planetary Data

9 The Moon and the Earth The earth radius is 6400 km. Eratosthenes (~240 BC) measured the earth radius within 15% error. Hipparchus (2nd century BC) measured the earthmoon distance as 400,000 kilometers (6.8% too large). So the Moon is roughly 60 Earth radii away. The lunar orbit period (a month) is ~27 days.

10 The Strong Evidence From the lunar distance to earth radius ratio From the period of the lunar orbit Show that the two ways of calculating the moon's acceleration agree.

11 The Strong Evidence From the lunar distance to earth radius ratio From the period of the lunar orbit

12 The Assumption To evaluate the acceleration of an object at the Earth s surface, Newton treated the Earth as if its mass were all concentrated at its center. That is, the gravitational force exerted by a finitesize, spherically symmetric mass distribution on a particle outside the distribution is the same as if the entire mass of the distribution were concentrated at the center. Newton proved it by calculus in 1687.

13 Attraction from a Spherical Mass

14 E-Field of a Charged Sphere The electric analogy Gauss's law

15 Kepler's Laws All planets move in elliptical orbits with the Sun at one focal point. (The conservation of angular momentum) The radius vector drawn from the Sun to a planet sweeps out equal areas in equal time intervals. The square of the orbital period of any planet is proportional to the cube of the semimajor axis of the elliptical orbit.

16 Conic Sections According to Newton's analysis, the possible orbits in a gravitational field can take the shape of the figures that are known as conic sections (so called because they may be obtained by slicing sections from a cone, as illustrated in the right figure).

17 The Gravitational Constant In addition to providing a value for G, the results show experimentally that the force is attractive, proportional to the product mm, and inversely proportional to the square of the distance r. The Cavendish apparatus for measuring G.

18 The Density of the Earth Can you calculate the density of the earth based on g, G, and the radius of the earth? Henry Cavendish ( ) in 1798 measured the constant G, which could lead to the amazing result.

19 The Density of the Earth Can you calculate the density of the earth based on g, G, and the radius of the earth? Henry Cavendish ( ) in 1798 measured the constant G, which could lead to the amazing result.

20 Common Rock Density In units of g/cm3 Andesite Basalt Coal Diabase Diorite Dolomite Gabbro Gneiss Granite Gypsum Limestone Marble Mica schist Peridotite Quartzite Rhyolite Rock salt Sandstone Shale Slate The core of the earth ought to be of higher density!

21 Physics at the Earth's Core

22 Variation of Free-Fall Acceleration Now consider an object of mass m located a distance h above the Earth s surface or a distance r from the Earth s center, where r = RE+ h. h g ' g0 2 g0 RE

23 Satellite Orbit Total mechanical energy (neglecting the kinetic energy of the larger body) is conserved: Geosynchronous orbit: (T = 1 day = s) T = 2 3 4π R G ME r s = km

24 Satellite Orbit What is the minimum speed to launch a satellite from the earth?

25 Satellite Orbit What is the minimum speed to launch a satellite from the earth? G MEm G MEm 1 2 mv = 2 RE 2 RE v = GM E = 7.8 km/ s RE

26 Changing the Orbit of a Satellite The space shuttle releases a 470-kg communications satellite while in an orbit that is 280 km above the surface of the Earth. A rocket engine on the satellite boosts it into a geosynchronous orbit, which is an orbit in which the satellite stays directly over a single location on the Earth. How much energy did the engine have to provide?

27 Changing Orbit

28 Escape Speed (from the Earth) Suppose an object of mass m is projected vertically upward from the Earth s surface with an initial speed. What is the minimum speed for the object to escape the gravity of the earth?

29 Escape Speed (from the Earth) Suppose an object of mass m is projected vertically upward from the Earth s surface with an initial speed. = 11.2 km/ s

30 Newton's Mountain

31 Rocket Propulsion The operation of a rocket depends upon the law of conservation of linear momentum as applied to a system of particles, where the system is the rocket plus its ejected fuel.

32 Rocket Propulsion The mass of the rocket without its fuel should be as small as possible and the rocket should carry as much fuel as possible. The rocket represents a case of the reverse of a perfectly inelastic collision: Momentum is conserved, but the kinetic energy of the system increases (at the expense of chemical potential energy in the fuel).

33 Thrust of a Rocket The thrust on the rocket is the force exerted on it by the ejected exhaust gases. The thrust increases as the exhaust speed increases and as the rate of change of mass (called the burn rate) increases.

34 Exercise: Rocket Propulsion

35 Exercise: Rocket Propulsion

36 Exercise: The Mass of the Sun

37 Exercise: The Mass of the Sun

38 Q: Escape Speed from the Sun What is the minimum speed for a rocket launched from the earth to escape the sun's gravity? First, it needs to escape the earth's gravity. Second, the residual speed needs to be large enough to escape the sun's gravity. Third, one needs to take into account that the earth has a speed in its orbit around the sun.

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