Question

1. if the mass of an object increases, what happens to its gravitational pull?

a) it decreases
b) it stays the same
c) it increases
d) it disappears

1. gravity in the solar system is always:

a) attractive
b) repulsive
c) weak
d) changing direction

1. which force holds galaxies together?

a) magnetism
b) gravity
c) friction
d) air pressure

Explanation:

Question 1

The gravitational force formula is \( F = G\frac{m_1m_2}{r^2} \), where \( m \) is mass. If an object's mass (\( m \)) increases, the gravitational pull (force) increases as mass is directly proportional to gravitational force (when other factors like distance \( r \) are constant). So the correct option is c.

Gravity is a fundamental force that is always attractive. In the solar system, gravitational force between celestial bodies (like planets, sun) is attractive, pulling them towards each other. Repulsive is opposite, weak is not always true (e.g., sun's gravity is strong), and changing direction is incorrect as gravity's direction is towards the mass. So the correct option is a.

Gravity is the force that acts over large distances (like between stars, galaxies) to hold them together. Magnetism acts on magnetic materials, friction is a contact force, and air pressure is a force from air molecules. So gravity holds galaxies together. The correct option is b.

Answer:

c) It increases

Question 2