Acceleration Physics 1 Dimensional Motion Chapter 2 Section 2 – pages 48-58.
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Transcript of Acceleration Physics 1 Dimensional Motion Chapter 2 Section 2 – pages 48-58.
AccelerationAcceleration
PhysicsPhysics
1 Dimensional Motion1 Dimensional Motion
Chapter 2 Section 2 – pages 48-Chapter 2 Section 2 – pages 48-5858
AccelerationAcceleration AccelerationAcceleration (a) – the rate of change (a) – the rate of change
of velocity in a given time intervalof velocity in a given time interval
- units = m/s- units = m/s22
- Equation- Equation
a a avgavg = = change in velocitychange in velocity = = Δ VΔ V = = vvff – – vvii
change in timechange in time Δt Δt ttff - t - tii
Acceleration has magnitude and Acceleration has magnitude and directiondirection
Can be positive or negativeCan be positive or negative
***A negative value for acceleration ***A negative value for acceleration does not always mean something is does not always mean something is slowing down! slowing down!
Acceleration has magnitude and Acceleration has magnitude and directiondirection
- Examples: (Table 2-3 page 51)- Examples: (Table 2-3 page 51)
- Speeding up in a positive direction = +a- Speeding up in a positive direction = +a
- Slowing down in a positive direction = -a- Slowing down in a positive direction = -a
- Speeding up in a negative direction = -a- Speeding up in a negative direction = -a
- Slowing down in a negative direction = +a- Slowing down in a negative direction = +a
- Constant velocity in positive or negative- Constant velocity in positive or negative
direction direction a = 0 m/s a = 0 m/s22
Motion with constant accelerationMotion with constant acceleration
Object speeds up or slows down at a Object speeds up or slows down at a uniform rateuniform rate
EquationsEquations
There are 4 motion (kinematic) There are 4 motion (kinematic) equations equations
Δx = ½ (VΔx = ½ (Vii + V + Vff) • Δt) • Δt
VVff = V = Vii + a • Δt + a • Δt
Δx = VΔx = Vii • Δt + ½ a • (Δt) • Δt + ½ a • (Δt)22
VVff22 = V = Vii
22 + 2a • Δx + 2a • Δx
Constant AccelerationConstant Acceleration
Increasing AccelerationIncreasing Acceleration
Acceleration ComparisonAcceleration Comparison
Negative Velocity and Negative Velocity and Positive AccelerationPositive Acceleration
Positive Velocity and Positive Velocity and Positive AccelerationPositive Acceleration
Positive Velocity and Positive Velocity and Negative AccelerationNegative Acceleration
Negative Velocity and Negative Velocity and Negative AccelerationNegative Acceleration
GraphingGraphing
A. Velocity vs. time graphA. Velocity vs. time graph
page 52 figure 2-11page 52 figure 2-11
B. Concept challenge page 50B. Concept challenge page 50
Homework / In class work:Homework / In class work:
p. 49 #1, 4, 5p. 49 #1, 4, 5
p. 53 #1, 3, 4p. 53 #1, 3, 4
p. 55 #1, 3, 4 p. 55 #1, 3, 4
p. 58 #3, 4, 5p. 58 #3, 4, 5