Home » Physics » Kinematics » Gravity accelerates downward

# Gravity accelerates downward

## Free Fall – how fast does an object move?

### g = 10 m/s2

Be careful: this value of “g’ isn’t a law of nature. This number changes on all worlds, moons, comets, etc.

——————————————–

# Frame of reference

___

## Learning standards

2016 Massachusetts Science and Technology/Engineering Standards
HS-PS2-10(MA). Use free-body force diagrams, algebraic expressions, and Newton’s laws of motion to predict changes to velocity and acceleration for an object moving in one dimension in various situations.

A Framework for K-12 Science Education: Practices, Crosscutting Concepts, and Core Ideas (2012)
PS2.A Forces and motion. How can one predict an object’s continued motion, changes in motion, or stability?

Massachusetts Science and Technology/Engineering Curriculum Framework (2006)
Introductory Physics. Motion and Forces. Central Concept: Newton’s laws of motion and gravitation describe and predict the motion of most objects.

1.1 Compare and contrast vector quantities (e.g., displacement, velocity, acceleration force, linear momentum) and scalar quantities (e.g., distance, speed, energy, mass, work)

1.2 Distinguish between displacement, distance, velocity, speed, and acceleration. Solve problems involving displacement, distance, velocity, speed, and constant acceleration.

1.3 Create and interpret graphs of 1-dimensional motion, such as position vs. time, distance vs. time, speed vs. time, velocity vs. time, and acceleration vs. time where acceleration is constant.

Physical Setting/Physics Core Curriculum (New York)
Key Idea 5: Energy and matter interact through forces that result in changes in motion

5.1 Explain and predict different patterns of motion of objects (e.g., linear and uniform
circular motion, velocity and acceleration, momentum and inertia).

i. construct and interpret graphs of position, velocity, or acceleration versus time
ii. determine and interpret slopes and areas of motion graphs
iii. determine the acceleration due to gravity near the surface of Earth

5.1e An object in free fall accelerates due to the force of gravity.* Friction and other
forces cause the actual motion of a falling object to deviate from its theoretical motion.

http://www.p12.nysed.gov/ciai/mst/sci/documents/phycoresci.pdf