Types of Motion What are the four types

Types of Motion

What are the four types of motion?

Types of Motion • Stationary ▫ no motion • Constant Velocity ▫ moving at a constant distance per second • Constantly changing velocity ▫ moving with a constant acceleration • Changing acceleration ▫ Constant jerk ▫ We don’t analyze this type of motion

Terminology we need: • Position – your location with respect to a reference point • Displacement – a change in position

Stationary Motion • What does stationary motion involve? ▫ Constant position ▫ Zero displacement

Constant Velocity • What does this mean? Ideas?

Average Speed • The rate at which an object covers distance • SCALAR quantity

Average Velocity • The rate at which an object changes position • VECTOR quantity (magnitude & direction)

9 (m) Total distance = d. T = 95 m Displacement = Δd = 55 m [L] 1. Find the person’s average speed. 2. Find the person’s average velocity.

10 Total distance = d. T = 420 m Displacement = Δd = 140 m [R] • • Determine the skier’s average speed. Determine the skier’s average velocity.

11 Your Turn! 1. A car is driven at 100. 0 km/h [W] for 45 minutes, then 90. 0 km/h [E] for 75 minutes, and then at 80. 0 km/h [W] for 65 minutes. a. Draw (up to scale) vectors to represent the velocity for each interval b. Determine the displacement at each interval and total displacement; c. compare displacement to the total distance travelled d. what’s the average speed for the trip and the average velocity for the trip [displtot=48. 9 km[W]] [disttot=274 km] [89. 0 km/h, 15. 9 km/h[W]]

12 And Again… 2. An animal runs for a total time of one minute and 10 seconds. It runs at 8. 0 m/s [R] for 15 s, and then 4. 5 m/s [L] for 40 s. It then runs to the Right for the rest of the trip. a. Draw a vector diagram to represent the animal’s position during each interval. b. If its average velocity for the entire trip was 0. 43 m/s [R], find its displacement during the final leg of the trip. (d 1= 120 m[R], d 2=180 m[L], dtot=30 m[R], d 3=90 m[R])

13 And Finally… 3. A person runs at a constant speed once around a circular track as shown to the right. The total time taken for one revolution is 105 seconds. FIND a. The average speed for the trip [5. 9 m/s] b. The average velocity for the trip [0 m/s] c. The average velocity from B to D[3. 8 m/s[L]]