Physics Unit 5; Gravity and Circular Motion
1. Centripetal acceleration always points: towards the center of the circle
2. What is the force that causes centripetal acceleration when a car
goes around a curve?: friction
3. Who created the Universal Law of Gravitation?: Newton
4. A particle P is moving in a circle with uniform speed. Which one of the
following diagrams correctly shows the direction of the acceleration a and
velocity v of the particle at one instant of time?: C
5. By what factor would the force of gravity change by if the mass of one
object doubled, but the distance between their centers also doubled: 0.5
6. By what factor would the force of gravity change if the distance between
the center of two objects doubled?: 0.25
7. A planet moves fastest during its orbit around the Sun when: it is closest to
the sun and gravity has a stronger pull
8. The planet with the shortest year is: Mercury
9. What is the direction of the velocity at point A, if the ball is revolving
clockwise?: right
10. What is the direction of the acceleration at point A, if the ball is revolving
clockwise?: down
11. What is the direction of the acceleration at point B, if the ball is revolving
clockwise?: left
12. If the centripetal force is the only force acting on the ball and it
disappears at point B, what direction would the ball travel, if the ball is
revolving clockwise?: down
13. Would Henry Cavendish have calculated a different value for G if he
would have used copper spheres instead of lead spheres in his
experiment.: no 14. Why do astronauts float in their space shuttles?: They
are in free-fall
15. How did Einstein explain gravity?: objects follow the bending of space-time
16. On the top of a tall mountain, the acceleration of gravity would be
__________ 9.8 m/s2: slightly less than
17. what happens to gravity as distance increases?: it decreases rapidly
18. does mass or weight change when an object is in space: only weight
19. Double the product of the masses of two objects: 2 times stronger gravity
force
20. How can you explain that the moon has a greater gravitational attraction
to the Earth than it does to the sun?: Closer to center of Earth
1. Centripetal acceleration always points: towards the center of the circle
2. What is the force that causes centripetal acceleration when a car
goes around a curve?: friction
3. Who created the Universal Law of Gravitation?: Newton
4. A particle P is moving in a circle with uniform speed. Which one of the
following diagrams correctly shows the direction of the acceleration a and
velocity v of the particle at one instant of time?: C
5. By what factor would the force of gravity change by if the mass of one
object doubled, but the distance between their centers also doubled: 0.5
6. By what factor would the force of gravity change if the distance between
the center of two objects doubled?: 0.25
7. A planet moves fastest during its orbit around the Sun when: it is closest to
the sun and gravity has a stronger pull
8. The planet with the shortest year is: Mercury
9. What is the direction of the velocity at point A, if the ball is revolving
clockwise?: right
10. What is the direction of the acceleration at point A, if the ball is revolving
clockwise?: down
11. What is the direction of the acceleration at point B, if the ball is revolving
clockwise?: left
12. If the centripetal force is the only force acting on the ball and it
disappears at point B, what direction would the ball travel, if the ball is
revolving clockwise?: down
13. Would Henry Cavendish have calculated a different value for G if he
would have used copper spheres instead of lead spheres in his
experiment.: no 14. Why do astronauts float in their space shuttles?: They
are in free-fall
15. How did Einstein explain gravity?: objects follow the bending of space-time
16. On the top of a tall mountain, the acceleration of gravity would be
__________ 9.8 m/s2: slightly less than
17. what happens to gravity as distance increases?: it decreases rapidly
18. does mass or weight change when an object is in space: only weight
19. Double the product of the masses of two objects: 2 times stronger gravity
force
20. How can you explain that the moon has a greater gravitational attraction
to the Earth than it does to the sun?: Closer to center of Earth
