Unit 1 Motion ProjectileMotion

Motion to Date  Uniform Motion  Accelerated Motion  Relative Motion

Uniform Motion  Motion with a constant velocity  Equation: - Constant speed - Same direction

Problems 1. An airplane travels 300 km in 1.25 hours. Find its speed.

2. A hunter travels 3 km [N] in 0.75 h and 2 km [E] in 30 minutes. Find her average: A) speed B) velocity

3.A kayaker can travel at 4 m/s relative to the water. If she is in a river that has a current of 2 m/s [S] find her velocity with respect to (wrt) the (i) shore and (ii) water if she heads A) Upstream B) Downstream C) Directly across the stream

 Applet Applet  VECTOR REVIEW?? VECTOR REVIEW?? VECTOR REVIEW??  Vector Addition Vector Addition Vector Addition –  Suppose the river is 50 m wide. How far will the kayak land downstream on the other side?

4.Suppose the kayaker want to land directly across the stream. A) Find the angle she would have to point to do so. B) Find the time it would take for her to get to the other side.

Accelerated motion  Motion with changing velocity  Examples?  Accelerated motion occurs when either –the speed is changing  speeding up or slowing down –Direction is changing  Curved motion

Equations for accelerated motion  Page 56 text  Formula Sheet Formula Sheet Formula Sheet

Examples 1.A cyclist can accelerate from 10. km/h to 30. km/h in 3.5s. Find his acceleration.

2.A glove is dropped from a chairlift and hits the ground 2 seconds later. A)How high is the chairlift? B)How fast was the glove travelling when it hit the ground?

3.Police measure skid marks to determine the speed of a car just before skidding started. If the acceleration of car is 7.5 m/s 2 (based on the surface condition of the road) and the length of the skid is 45 m, determine the speed the car was traveling before locking the tires. (Assuming the car was stopped at the end of the skid.)

4.Determine the speed the object hits the ground. 100 m The object has an initial upwards velocity of 25 m/s.

5.Determine the time it would take a rock to hit the ground if: A) it was dropped from a height of 2 m. B) thrown upwards at 20 m/s from the 2 m height. C) thrown downwards at 20 m/s from the 2 m height.

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What is projectile motion?  Anything that is thrown that has some _____________ motion. –Jumping on a _____, ___, __________, _________, skakeboards, __________, horses, ______. –Running off a ________________. –_____________________ that are shot. –Throwing __________ or ___________, or kicking a ______________.

 A projectile is any object which, once projected, continues its motion by its own ________ and is influenced only by the downward force of ________.

 It is important to study this if you want objects to land in certain spots Movie 1 Movie 1 Movie 2 Movie 2

 What describes the path of a projectile? –__________________  In 3204 projectile motion is limited to negligible _____________ – otes/projectile/projectile.html otes/projectile/projectile.htmlhttp://physics.usask.ca/~pywell/p121/N otes/projectile/projectile.html –Mythbusters Mythbusters

 Horizontal motion (__-direction) is ____________ (no _____________)  Vertical motion (__-direction) is _______________ (____________)  Distance travelled in the x-direction is defined as ________.  Time is the ______ in both the x and y direction.

Equations for Projectile Motion  Horizontal Motion (x-direction) Uniform Motion Uniform Motion  Vertical Motion (y-direction) Accelerated Motion

Components of Velocity Components of Velocity  Mathematically determine the components of velocity at certain points along a projectile’s motion. –Applet Applet

Types of Projectile Motion  _______________ moving off a cliff –(_____________________)  Projected motion at ____________, and lands at a point

 Projected motion at an angle , and lands at a point: A) level with launchB) Above launch C) below launch

Projectiles with zero vertical velocity  Worksheet 1 Worksheet 1 Worksheet 1

Projectiles with NON zero vertical velocity  Worksheet 2 Worksheet 2 Worksheet 2

 Worksheet 3 Worksheet 3 Worksheet 3

 Assignment

 The Physics of Juggling The Physics of Juggling The Physics of Juggling

 Applet Applet  Air resistance Air resistance Air resistance

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