Slide 1 / The discovery of Universal Gravitation is associated with: Robert Hook Isaac Newton James Joule Max Plank Christian Huygens
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1 Slide 1 / 22 1 The discovery of Universal Gravitation is associated with: Robert Hook Isaac Newton James Joule Max Plank hristian Huygens
2 Slide 2 / 22 2 Two objects with equal masses of 1 kg each are separated by a distance of 1 m. The gravitational force between the objects is: Slightly less than G Slightly greater that G qual to G Half as much of G Twice as much of G
3 Slide 3 / 22 3 Two objects, one with a mass of m and one with a mass of 4m are attracted to each other by a gravitational force. If the force on 4m is F, what is the force on mass m in terms of F? 16F 4 F F 1/4 F 1/16 F
4 Slide 4 / 22 4 n apple hangs on a tree on the arth. Which of the following statements is correct? The force on the apple is greater than the force on the arth because the arth is more massive. The force on the arth is greater than the force on the apple because the arth is more massive. The force on the apple is less than the force on the arth because the tree is supporting the apple. The forces on the apple and arth are equal. The forces on the apple and the arth are zero because they are not touching each other.
5 Slide 5 / 22 5 Two objects are attracted to each other by a gravitational force F. If one mass is doubled and the other is tripled without changing the distance, what is the new gravitational force between the objects in terms of F? 4 F 9 F 6 F 1/9 F 1/6 F
6 Slide 6 / 22 6 Two objects are attracted to each other by a gravitational force F. If the distance between the objects is doubled, what is the new gravitational force between the objects in terms of F? 4 F 9 F 16 F 1/9 F 1/4 F
7 Slide 7 / 22 7 Two objects are attracted to each other by a gravitational force F. If each mass is tripled and the distance between the objects is cut in half, what is the new gravitational force between the objects in terms of F? 24 F 9 F 16 F 1/16 F 1/24 F
8 Slide 8 / 22 8 n object with a mass of 48 kg measured on arth is taken to the Moon. What is the mass of the object on the Moon s surface if the acceleration due to gravity on Moon is one-sixth of that on arth? 8 kg 48 kg 288 kg 480 kg 80 kg
9 Slide 9 / 22 9 n object with a mass of 48 kg measured on arth is taken to the Moon. What is the weight of the object on the Moon s surface if the acceleration due to gravity on Moon is one-sixth of that on arth? 8 N 48 N 288 N 480 N 80 N
10 Slide 10 / rocket moves away from the surface of arth. s the distance r from the center of the planet increases, what happens to the force of gravity on the rocket? The force increases directly proportional to r The force increases directly proportional to r 2 The force doesn t change The force becomes zero after the rocket loses the contact with arth The force decreases inversely proportional to
11 Slide 11 / spacecraft is orbiting arth with an orbital radius r. Which of the following is true about the astronaut s apparent weight? The apparent weight is slightly less than the weight on the surface The apparent weight is slightly greater than the weight on the surface The apparent weight is the same as the weight on the surface The apparent weight is zero because the astronaut is in a free fall More information is required
12 Slide 12 / spacecraft starts on arth is moving to Mars. Which of the following is correct about the gravitational force on the spacecraft due to arth s attraction? The force becomes zero when the spacecraft is half way between the planets The force becomes zero when the spacecraft is closer to the surface of Mars The spacecraft is never beyond the arth s gravitational attraction The force becomes zero when the spacecraft land on the surface of Mars More information is required
13 Slide 13 / satellite is orbiting arth at a distance h = R above the surface. What is the centripetal acceleration of the satellite compared to that on the surface? a = a = a = g a = 2g a = 4g
14 Slide 14 / What is the ratio between the acceleration due to gravity of two hypothetical planets X and Y, if the mass of the planet X is three times greater than the mass of the planet Y, and the radius of the planet X is twice greater than the radius of the planet Y?
15 Slide 15 / hypothetical planet has a mass of four times that of the arth and radius of twice that of the arth. What is the acceleration due to gravity on the planet in terms of the acceleration on the arth?
16 Slide 16 / Two planets X and Y have the same surface gravity, but planet X has four times the mass of planet Y. What is the radius of planet X in terms of the radius of planet Y? R x = 4 R y R x = 16 R y R x = 8 R y R x = 2 R y R x = ½ R y
17 Slide 17 / satellite is orbiting a planet of mass M with an orbital radius r. Which of the following represents the orbital velocity of the satellite?
18 Slide 18 / satellite is orbiting a planet with an orbital radius r. Which of the following diagrams represents the direction of the velocity and acceleration of the satellite?
19 Slide 19 / satellite has twice the mass of satellite. The satellites orbit a planet with the same orbital radius. The orbital velocity of the satellite compared to is: Twice greater Four times greater Half as much One-quarter as much The same
20 Slide 20 / Two satellites and orbit the same planet. Satellite moves in circular orbit with twice greater radius than satellite. What is the orbital velocity of satellite compared to the velocity of?
21 Slide 21 / satellite moves around a planet of mass 4M, another satellite moves around a planet of mass M. What is the orbital period of satellite in terms of that of satellite if the orbital radius is the same for both cases?
22 Slide 22 / 22
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Objectives Forces Describe forces, and explain how forces act on objects. Determine the net force when more than one force is acting on an object. Compare balanced and unbalanced forces. Describe ways
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