Section 3 Acceleration Essential Questions How are acceleration
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Section 3 Acceleration
Essential Questions How are acceleration, time, and velocity related? What are three ways an object can accelerate? How can an object’s acceleration be calculated? What are the similarities and differences between straight line motion, circular motion, and projectile motion?
Review Vocabulary velocity: describes the speed and direction of a moving object
New Vocabulary acceleration centripetal acceleration
Velocity and Acceleration You are sitting in a car at a stoplight when the light turns green. The driver steps on the gas pedal and the car starts moving faster and faster. Just as speed is the rate of change of position, acceleration is the rate of change of velocity. When the velocity of an object changes, the object is accelerating.
Motion in Two Dimensions So far, we have only discussed motion in a straight line. But most objects are not restricted to moving in a straight line. Recall that we cannot add measurements that are not in the same or opposite directions. So, we will discuss motion in each direction separately. For example, suppose a student walked three blocks north and four blocks east. The trip could be described this way: the student walked north for three blocks at 1 m/s and then walked east for four blocks east at 2 m/s.
Speed-time graphs and acceleration
Calculating acceleration
Motion in Two Dimensions
Circular Motion
Projectile Motion Horizontal and Vertical Motion
Speed-time graphs and acceleration
Assessment 1. Which of the following is the SI unit of acceleration? A s/km 2 B km/h C m/s 2 D cm/s CORRECT
Assessment 2. Which of the following is not used in calculating acceleration? A initial velocity B average speed C time interval D final velocity CORRECT
Assessment 3. In which of the following conditions does the car not accelerate? A A car moves at 80 km/h on a flat, straight highway. B The car slows from 80 km/h to 35 km/h. C The car turns a corner. D The car speeds up from 35 km/h to 80 km/h. CORRECT
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