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### Freely Falling Objects

• Near the surface of the Earth, the acceleration due to gravity is a constant given by 9.8 m/s2 and it is always directed vertically down.
• When dealing with objects moving up and down, displacement, velocity, and acceleration may be positive or negative. Usually, the upward direction is chosen as the positive direction; then, any quantity directed downward (such as the acceleration due to gravity) is negative.

### Freely Falling Objects

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

• Intro 0:00
• Acceleration Due to Gravity 0:11
• Dropping an Object at Certain Height
• Signs : V , A , D 7:07
• Example: Shooting an Object Upwards
• Example: Ground To Ground 12:13
• Velocity at Maximum Height
• Time From Ground to Ground
• Shortcut: Calculate Time Spent in Air
• Example: Object Short Downwards 30:19
• Object Short Downwards From a Height H