1 UCT PHY1025F: Mechanics Physics 1025F Mechanics Dr. Steve Peterson KINEMATICS.

Slides:



Advertisements
Similar presentations
Physics: Principles with Applications, 6th edition
Advertisements

Describing Motion: Kinematics in One Dimension
Section 3-5: Projectile Motion
Motion in Two Dimensions
Agenda 1) Warm-Up 5 min 2) Vocab. Words 10 min 3) Projectile Motion Intro. 15 min 4) Pre-Lab Vectors 15 min 5) Vector Lab 30 min Spring scale.
PHY1012F KINEMATICS IN 2D Gregor Leigh
Free Fall Projectile Motion – free fall, but not vertical.
Chap 3 :Kinematics in 2D, 3D and Projectile Motion HW4: Chap.3:Pb.14,Pb.57, Pb.87 Chap 4:Pb.3, Pb.4, Pb.12, Pb.27, Pb. 37 Due Friday 26.
Acceleration and Free Fall Chapter 2.2 and 2.3. What is acceleration? Acceleration measures the rate of change in velocity. Average acceleration = change.
Quick Review: Four Kinematic Equations Free Fall
High School by SSL Technologies Physics Ex-32 Projectile motion is the vectorial sum of two independent velocities, a horizontal component and a vertical.
Page 24 #10 If the stone had been kicked harder, the time it took to fall would be unchanged.
Warm - up Problem: A sprinter accelerates from rest to 10.0 m/s in 1.35s. a.) What is her acceleration? b.) How far has she traveled in 1.35 seconds?
Linear Motion Chapters 2 and 3.
Copyright © 2009 Pearson Education, Inc. PHY093 – Lecture 2b Motion with Constant Acceleration 2 Dimensions 1.
5.6 Projectiles Launched at an Angle
Motion in Two Dimensions
Projectile Motion I 11/7/14. Throwing a ball in the air On the way up: At the top of the throw: On the way down: velocity decreases acceleration stays.
Chapter 3 Motion in Two Dimensions
©2008 by W.H. Freeman and Company Chapter 2 Motionin One Dimension.
Motion in One Dimension
Motion in One Dimension
AIM: How can we describe the path of an object fired horizontally from a height above the ground? DO NOW: A ball rolls off a table top with an initial.
Physics pre-AP. Equations of motion : We assume NO AIR RESISTANCE! (Welcome to “Physicsland”), therefore… The path of a projectile is a parabola. Horizontal.
Describing Motion: Kinematics in One Dimension. Sub units Reference Frames and Displacement Average Velocity Instantaneous Velocity Acceleration Motion.
More Projectile Motion Discussion: Examples
PDT 180 ENGINEERING SCIENCE Vectors And Scalars (Continue)
Chapter 3 Acceleration Lecture 1
Projectiles Horizontal Projection Horizontally: Vertically: Vertical acceleration g  9.8 To investigate the motion of a projectile, its horizontal and.
Chapter 2 Describing Motion: Kinematics in One Dimension.
Chapter 2 Motion in One Dimension. Kinematics Describes motion while ignoring the external agents that might have caused or modified the motion For now,
Chapter 2 Motion Along a Line. MFMcGraw- PHY 1410Ch_02b-Revised 5/31/20102 Motion Along a Line Position & Displacement Speed & Velocity Acceleration Describing.
© 2010 Pearson Education, Inc. Lecture Outline Chapter 3 College Physics, 7 th Edition Wilson / Buffa / Lou.
Parabolic or Projectile Motion
Chapter 4 Two-Dimensional Kinematics. Units of Chapter 4 Motion in Two Dimensions Projectile Motion: Basic Equations Zero Launch Angle General Launch.
Chapter 3 Kinematics in Two Dimensions. 3.1 – d, v, & a A bullet is fired horizontally. A second bullet is dropped at the same time and at from the same.
Chapter 2 MOTION IN ONE DIMENSION. Particle: A point-like object – that is, an object with mass but having infinitesimal size.
PROJECTILE MOTION. Relevant Physics: The Independence of the Vertical and Horizontal directions means that a projectile motion problem consists of two.
CHAPTER 6 MOTION IN 2 DIMENSIONS.
Projectile Motion Projectile motion: a combination of horizontal motion with constant horizontal velocity and vertical motion with a constant downward.
Chapter 2 Describing Motion: Kinematics in One Dimension.
Chapter 2 Kinematics in One Dimension Mechanics – forces & motion Kinematics – describes motion Dynamics – causes of motion (forces)
Projectile Motion.
5.6 Projectiles Launched at an Angle. No matter the angle at which a projectile is launched, the vertical distance of fall beneath the idealized straight-line.
Motion Along a Straight Line Chapter 3. Position, Displacement, and Average Velocity Kinematics is the classification and comparison of motions For this.
Projectile Motion Introduction Horizontal launch.
PHY 151: Lecture 4A 4.1 Position, Velocity, and Acceleration Vectors 4.2 Two-Dimensional Motion with Constant Acceleration 4.3 Projectile Motion.
Ying Yi PhD Chapter 3 Kinematics in Two Dimension 1 PHYS HCC.
Chapter 2 Motion in ONE dimension. Displacement This chapter we are only doing to study motion in one direction. This chapter we are only doing to study.
Chapter 3 Describing Motion: Kinematics in One Dimension.
* Moving in the x and y direction * A projectile is an object shot through the air. This occurs in a parabola curve.
Projectile Motion Chapter 5.4 – 5.6 Notes. Projectile Motion A projectile is any object that moves through the air or space, acted on only by gravity.
Part 1 Projectiles launched horizontally
Do Now: I want to drop a 25 gram marble on top of an ant that will have a vertical displacement “h”. Assuming it was dropped from rest, write an expression.
Describing Motion: Kinematics in One Dimension
Projectile Motion AP Physics C.
Review Questions Chapter 3
Physics 13 General Physics 1
Warm-Up 09/13/10 Please express the Graphic Vector Addition Sums in MAGNITUDE-ANGLE format (last two pages of PhyzJob packet)
Equations of Kinematics in One Dimension
The height of the building
Projectile motion Projectile Motion Subject to Gravity Assumptions:
Projectiles.
Chapter-3 Kinematics in Two Dimensions
Chapter 3 Jeopardy Review
Describing Motion: Kinematics in One Dimension
Chapter 2 Motion in One Dimension
In the previous chapter we studied simple straight-line motion—linear motion.
Describing Motion: Kinematics in One Dimension
College Physics, 7th Edition
Presentation transcript:

1 UCT PHY1025F: Mechanics Physics 1025F Mechanics Dr. Steve Peterson KINEMATICS

2 UCT PHY1025F: Mechanics Distance vs Displacement We make a distinction between distance and displacement. Displacement is how far the object is from its starting point, regardless of how it got there. Distance traveled is measured along the actual path.

3 UCT PHY1025F: Mechanics Displacement Displacement is the change in position of a body written as: or

4 UCT PHY1025F: Mechanics Speed vs Velocity Speed is how far an object travels in a given time interval Velocity includes directional information:

5 UCT PHY1025F: Mechanics Velocity Velocity is the rate of change of displacement The magnitude of v is: The direction of v is: in the same direction as

6 UCT PHY1025F: Mechanics Acceleration Acceleration is the rate of change of velocity The magnitude of a is: The direction of a is: same direction as, not v Acceleration is a vector, although in one-dimensional motion we only need the sign.

7 UCT PHY1025F: Mechanics Deceleration There is a difference between negative acceleration and deceleration: Negative acceleration is acceleration in the negative direction as defined by the coordinate system. Deceleration occurs when the acceleration is opposite in direction to the velocity.

8 UCT PHY1025F: Mechanics Kinematic Equations The full set of equations describing motion in a straight line under constant acceleration is: Always remember that Δx is displacement or change in position, therefore if the body is originally at position x 0, and after time t, it is at position x, then

9 UCT PHY1025F: Mechanics Three Types of Motion Graphs Position versus Time Velocity versus Time Acceleration versus Time Notes A graph of “A versus B” means that A is graphed on the vertical axis and B on the horizontal axis. A graph is not a picture of the motion, but an abstract representation of the motion Motion Graphs

10 UCT PHY1025F: Mechanics Position versus Time Motion diagram (student walking to school) Table of data Graph

11 UCT PHY1025F: Mechanics Example: Velocity vs Time Below are four position versus time graphs, draw the corresponding velocity versus time graphs.

12 UCT PHY1025F: Mechanics Free Fall One of the best examples of motion in a straight line under constant acceleration is “free fall.” In the absence of air resistance all objects fall at the same acceleration under the influence of gravity. g = 9.80 m/s 2 (i.e. ≈ 10 m/s 2 )

13 UCT PHY1025F: Mechanics Example: Free Fall A ball is thrown directly up into the air at 30 m/s. How high does it go? What is the time of flight? What is the speed with which it hits the ground? Sketch a vs t, v vs t, Δx vs t.

14 UCT PHY1025F: Mechanics Chapter 3: Projectile Motion A projectile is an object moving in two dimensions under the influence of Earth’s gravitational field; its path is a parabola. It can be understood by analysing the horizontal and vertical motions separately

15 UCT PHY1025F: Mechanics Example: 2D Free Fall Let’s follow the motion of a ball rolling off a table at a velocity of 2 m/s.

16 UCT PHY1025F: Mechanics Example: Projectile Motion Let’s give the ball a horizontal (x-dir) and vertical (y-dir) component to its velocity (v x = 10 m/s & v y = 30 m/s). What would its motion look like (starting from the origin)?

17 UCT PHY1025F: Mechanics Projectile Motion Example 1 A plane drops a package of emergency rations to a stranded hiker. The plane is traveling horizontally at 40.0 m/s at a height of 1.00 x 10 2 m above the ground. Where does the package strike the ground relative to the point at which it was released?

18 UCT PHY1025F: Mechanics Projectile Motion Example 2 A stone is thrown upward from the top of a building at an angle of 30.0° to the horizontal and with an initial speed of 20.0 m/s. The point of release is 45.0 m above the ground. (a) How long does it take for the stone to hit the ground? (b) Find the stone’s speed at impact. (c) Find the horizontal range of the stone. Neglect air resistance.