PPT-Lesson 3 – Acceleration Due to Gravity

MindsOn this slide is not intended to be shown in class Materials 2 sheets of paper 1 rubber ball Demo Take 2 identical sheets of paper Show students they are identical Crumple one sheet into a ball Hold out the . Objects have a property called . inertia . which causes them to resist . changes. in their motion (Newton’s1. st. Law or Galileo’s law of inertia). .  . if it is at rest, it stays at rest.  if it is moving, it keeps moving with constant velocity. or . Gravity is making me do it!!. What is . free fall?. Free Fall is the motion of the body when . air resistance is negligible. . and the action can be considered . due to gravity alone. .. Free fall Video. Theories of motion. Aristotle was a Greek philosopher who lived in the 4. th. century BC.. Aristotle explained the behaviour of a falling body by saying that its speed depended on how much earth element it contained. . a = 0 . case. no . acceleration  velocity is constant  v = . v. i. position . vs. time  . x. f. . = x . i. . + . v . t,. . x. i. . is the starting . position. acceleration = a = constant. Objects have a property called . inertia . which causes them to resist . changes. in their motion (Newton’s1. st. Law or Galileo’s law of inertia). .  . if it is at rest, it stays at rest.  if it is moving, it keeps moving with constant velocity. Write down all given information. Write the formula you need to solve the problem.. Substitute the numbers in the equation.. Show all operations and solve.. Answers should include both numbers and units.. a = 0 case. no acceleration  velocity is constant  v = v. i. position vs. time  . x. f. = x . i. + v t,. x. i. is the starting . position, . x. f. is the ending position. acceleration = a = constant. Objects have a property called . inertia . which causes them to resist . changes. in their motion (Newton’s1. st. Law or Galileo’s law of inertia). .  . if it is at rest, it stays at rest.  if it is moving, it keeps moving with constant velocity. Write the questions in your notebook. . Answer them.. 1. What is speed?. 2. What is velocity?. 3. What is acceleration?. 4. How can acceleration be changed?. 5. What pulls the ball down in the video?. Describe the speedometer on a car that is entering a highway, drives for 25 miles and then exits the highway.. Consider the two situations below. When a shuttle bus approaches a stop, the driver begins to apply the brakes to slow down 5.0 s before actually reaching the stop. The speed changes from 9.0 m/s to 0 m/s over time.. Today: Finish Chapter 3 Chap 4 - Newton’s Second Law In Chapter 4, we establish a relationship between force (chap 2) and acceleration (chap. 3). Reminder: http:// www.hunter.cuny.edu/physics/courses/physics100/fall-2016 V. ector quantity: . magnitude (value) & direction. R. ate . at which an object changes its velocity. . “. How fast an object is getting faster”. If the velocity of an object is changing, it is accelerating!. 2016. Measuring Distance. Meter . – . international unit for measuring distance.. = 50 m. 1 mm. Calculating Speed. Speed. (S) . = distance traveled (d) / the amount of time it took (t). . S = d/t. Experiencing Gravity’s Effects. Review: Symbols and Language. Symbol. Stands. For. Meaning. F. g. Gravitational Force. This is the magnitude. of the gravitational force on an object, which can also refer to the weight of an object..