Question

1. if the mass of an object increases, its gravitational pull. a) decreases b) stays the same c) increases d) disappears 18 which change would decrease gravitational force between two planets? a) increasing mass b) decreasing distance c) increasing distance d) orbiting closer together 19. what keeps the planets in orbit around the sun? a) sun’s magnetism b) gravity c) wind d) electric charge 20. which object has the strongest gravitational pull? a) earth b) moon c) sun d) mars part 3 – scale of the solar system the solar system is made up of the sun, planets, moons, and other objects. scientists use scale models to help us understand the size and distance relationships between these objects. one astronomical unit (au) is the distance from the earth to the sun. there are two groups of planets: inner planets (rocky) and outer planets (gas giants). models are useful but have limitations—they can’t always show both distance and size perfectly at the same time. key vocabulary: scale model, astronomical unit (au), light year, diameter, radius, orbit, inner planets, outer planets, gas giants, dwarf planet fill in the blank: fill in the blank with the correct words. 21. the distance from earth to the sun is called one __________ 22. jupiter and saturn are known as ________ 23. a ________ helps us understand sizes and distances in the solar system. 24. a __________ planet is much smaller than the other planets, like pluto.

Explanation:

1. According to Newton's law of universal gravitation, gravitational force is directly proportional to mass. So, as mass increases, gravitational pull increases.
2. Gravitational force is inversely - proportional to the square of the distance between two objects. Increasing distance decreases the gravitational force.
3. Gravity is the force that keeps planets in orbit around the Sun.
4. The Sun has the largest mass among Earth, Moon, Sun and Mars. Since gravitational pull is directly related to mass, the Sun has the strongest gravitational pull.
5. The distance from Earth to the Sun is defined as one Astronomical Unit (AU).
6. Jupiter and Saturn are large gas - based planets known as gas giants.
7. Scale models are used to understand sizes and distances in the solar system.
8. A dwarf planet like Pluto is much smaller than other planets.

Answer:

1. c) Increases
2. c) Increasing distance
3. b) Gravity
4. c) Sun
5. Astronomical Unit (AU)
6. gas giants
7. scale model
8. dwarf