The document describes the fundamental force of gravity. It explains that gravity is a weak but predictable force that helped form the universe and has a constant presence, distorting space and time and acting on all matter through mass. Gravity keeps objects like ourselves on Earth and the Earth orbiting the sun according to laws proposed by Newton and Einstein describing gravity's proportional relationship to mass and dependence on net force and inertia.

1. Thing 1
• Very Weak
• Predictable Force
• Helped form the universe
• Property of mass/matter
• Proportional to mass
• Affected by (Net) Force
Thing 2

2. Thing 1
• Very Weak
• Predictable Force
• Helped form the universe
• Constant presence
• Acts on all matter in the
universe
• Distortion of space/time
• Property of mass/matter
• Proportional to mass
• Affected by (Net) Force
• Resistance to change in velocity
• An object will not speed up on its
own
• An object will not slow down on
its own
Thing 2

3. Thing 1
• Very Weak
• Predictable Force
• Helped form the universe
• Constant presence
• Acts on all matter in the
universe
• Distortion of space/time
• Function of mass and distance
• A push
• A pull
• Property of mass/matter
• Proportional to mass
• Affected by (Net) Force
• Resistance to change in velocity
• An object will not speed up on its
own
• An object will not slow down on
its own
• An object will not start moving
on its own
• An object will not stop moving on
its own
• Idea first proposed by Galileo
Thing 2

4. Thing 1
• Very Weak
• Predictable Force
• Helped form the universe
• Constant presence
• Acts on all matter in the
universe
• Distortion of space/time
• Function of mass and distance
• A push
• A pull
• Keeps you on the Earth
• Keeps the Earth around the
sun
• Idea first proposed by Newton
• Einstein
• Property of mass/matter
• Proportional to mass
• Affected by (Net) Force
• Resistance to change in velocity
• An object will not speed up on its
own
• An object will not slow down on its
own
• An object will not start moving on
its own
• An object will not stop moving on
its own
• Idea first proposed by Galileo
• Explained by Newton
• An object in motion will stay in
motion unless acted on by an
outside force
• An object at rest will stay at rest
unless acted on by an outside force
• First Law of Motion
Thing 2

5. Gravity
• Very Weak
• Predictable Force
• Helped form the universe
• Constant presence
• Acts on all matter in the
universe
• Distortion of space/time
• Function of mass and distance
• A push
• A pull
• Keeps you on the Earth
• Keeps the Earth around the
sun
• Idea first proposed by Newton
• Einstein
• Property of mass/matter
• Proportional to mass
• Affected by (Net) Force
• Resistance to change in velocity
• An object will not speed up on its
own
• An object will not slow down on its
own
• An object will not start moving on
its own
• An object will not stop moving on
its own
• Idea first proposed by Galileo
• Explained by Newton
• An object in motion will stay in
motion unless acted on by an
outside force
• An object at rest will stay at rest
unless acted on by an outside force
• First Law of Motion
Inertia

6. Microgravity Article
1. First reading: annotate
2. Second reading: complete story strip