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Translational and Rotational Motion.pptx

engineering

Engineering◦
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TRANSLATIONAL ROTATIONAL MOTION &
OBJECTIVES compare and contrast translational and rotational motion in terms of their respective linear and angular quantities. demonstrate through simple activities the relationship between linear and angular quantities (human movement, ergonomic designs).
GAME KNB? ACTIVITY 1 A B C D
1. What physical quantity describes the rate of distance traveled by an object? A. displacement B. speed C. velocity D. acceleration
2. Which among the following bodies shows a purely translational or linear motion? A B C D
3. Which among the following bodies shows a combination of translational and rotational motion? A B C D
For numbers 4 and 5, refer to the scenario and figure given below. A car is initially 5.0 m to the right of a lamp post. Three seconds later, it is 20 m to the right of the reference. 4. What is the total distance traveled by the car? A. 5 m C. 15 m B. 10 m D. 25 m
For numbers 4 and 5, refer to the scenario and figure given below. A car is initially 5.0 m to the right of a lamp post. Three seconds later, it is 20 m to the right of the reference. 5. What is the speed of the car in meters per second? A. 5.0 m/s C. 45 m/s B. 6.7 ms/ D. 60 m/s
6. What is the average velocity of the car within the 3.0-second interval? A. 5.0 m/s, to the right B. 6.7 ms/, to the right C. 45 m/s, to the right D. 60 m/s, to the right
7. What is needed to be exerted on a body for it to move translationally or linearly? A. a non-zero net inertia B. a non-zero net acceleration C. a non-zero net torque D. a non-zero net force
8. A 10-kg box is resting on the floor. Which of the following statements is correct? (Assume that g = 10 m/s2) A. The measure of the inertia of the box is 100 newtons. B. The earth pulls down the box with a 10-newton force. C. The floor supports the box with an upward, 10- newton force. D. The magnitude of the floor’s force on the box is equal to the magnitude of the box’s weight.
9. Which of the following best describes angular displacement? A. The distance covered by a body in a straight line B. The total length of the path traveled C. The angle through which an object rotates about a fixed axis D. The change in speed over time
10. A person walks 5 meters east from her starting point. What physical quantity best describes this change in position? A. Angular displacement B. Linear displacement C. Velocity D. Torque
WHAT ARE THE FUNDAMENTAL TYPES OF MOTION?
Examine the picture. Classify the various types of motions is shown based on your category
TYPES OF MOTION FOUR FUNDAMENTAL
TRANSLATIONAL MOTION LINEAR MOTION • Involves the movement of an object along a straight or curved path. • Every point in the object moves the same distance in the same direction over time. The object does not change orientation.
Example: moving cable cars (with the people in them)
ROTATIONAL MOTION ANGULAR MOTION • This refers to an object spinning around an axis. • Different points on the object move in circular paths, with varying linear speeds depending on their distance from the axis.
Example: rotating Ferris wheel
TRANSLATIONAL ROTATIONAL MOTION COMBINED • Example: the biker’s legs as he pedals and the wheels in the person-bike system • The person (except his legs) and the bicycle (except the two wheels), move in a purely translational motion. However, the person’s legs and the two wheels move in combined rotational and translational motion.
Example: rotating Ferris wheel
PERIODIC MOTION • This refers to a repetitive movement (with respect to a reference) within regular intervals of time.
WHAT ANGULAR QUANTITIES THAT DESCRIBE ROTATIONAL MOTION ARE ANALOGOUS TO THE FOLLOWING LINEAR QUANTITIES THAT DESCRIBE AND EXPLAIN TRANSLATIONAL MOTION?
What is torque (or moment of force) as a physical quantity that relates translational and rotational motion? What are the three factors that affect the direction of the torque of a force (symbol: Greek letter, tau, ) with respect to a reference point, and how 𝝉 these relate with one another .
“Why are doorknobs placed farthest from a door’s hinges?
DO this: 1. Push the door at the door knob with less effort 2. Apply a full force at the same point of the door and the same orientation (arm perpendicular to the door).
Which of the two cases resulted in a wider opening (or rotation) of the door: the one with less effort or the one with maximum effort? Generalization: stronger applied force, greater rotation the magnitude of an applied force is directly proportional to the magnitude of a force’s torque.