Download presentation
Presentation is loading. Please wait.
Published byMarybeth Sims Modified over 8 years ago
1
How is free fall acceleration different from regular acceleration you experience in your car? Name three ways physics is used in your home.
2
TEKS 1A, 2H,J, 3A,D, 4A,B,C
4
Freely falling bodies undergo constant acceleration In the absence of air resistance (vacuum) all objects dropped near the surface of a planet fall with the same constant acceleration. This is called free fall. Free fall acceleration is denoted using the symbol g and at the surface of the earth is g=-9.81m/s 2
5
Thrown objects experience gravity throughout their entire trip. At the peak of the object’s height, its velocity is 0m/s Free fall objects always have the same downward acceleration The only things that change are the object’s velocity and position
6
Jason hits a volleyball so that it moves with an initial velocity of 6m/s straight up. If the volleyball starts 2m from the floor, how long will it be in the air before it strikes the floor?
7
Known v i = 6m/s a=g= -9.81m/s 2 ∆ d = -2m v f 2 = v i 2 +2a ∆ d v f = v i + a ∆ t Unknown ? ∆ t To find ∆ t, we must first find v f from the first equation. Then, we will use that answer in the second equation.
8
Since ball will be moving toward the floor v f will be negative. So v f = -8.7m/s Rearranging the second formula for ∆t, we get:
9
Time is always positive In free fall, acceleration is always due to gravity which is –9.81m/s 2 unless otherwise stated
10
Practice 2F p.64 all Section Review p.65 #1-4
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.