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Motion Velocity Acceleration Force Friction 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 4 4 4 4 4 5 5 5 5 5 Motion 1 ______ is the rate of change in position Motion 1 Speed is the rate of change In position Motion 2 ________ speed is the total distance divided by the total time Motion 2 Average speed is the total distance divided by the total time Motion 3 What is an object’s change in position relative to a reference point? _________ Motion 3 What is an objects change in position relative to a reference point? motion Motion 4 Speed that does not vary is called ________ speed Motion 4 Speed that does not vary is called Constant speed Motion 5 The picture indicates what kind of speed? Motion 5 Instantaneous speed Velocity 1 True or False Two bicycle riders have the same speed. Their velocity must also be the same. Velocity 1 False Their directions may be different. Velocity 2 People on Merry-go-rounds change velocity because the _______ changes Velocity 2 People on Merry-go-rounds change velocity because the direction changes Velocity 3 DAILY DOUBLE 1. What is the equation for calculating velocity? 2. What does each variable stand for? Velocity 3 DAILY DOUBLE 1. v = d/t 2. v = velocity (speed) d = distance t = time Velocity 4 Amy swam 50 m downstream in 25 seconds. What was her average velocity? Velocity 4 Amy swam 50 m downstream in 25 seconds. What was her average velocity? V = d/t = 50 m/ 25 s = 2 m/s Velocity 5 If Andy drives his dune buggy at an average velocity of 350 m/s how long would it take him to go 5 km? Velocity 5 If Andy drives his dune buggy at an average velocity of 120 km/h how long would it take him to go 5 km? V=d/t so t = d/v Convert km to m 5 km = 5000 m t = 5 km 120 km/h =0.042h = 60 min * 0.042 = 2.5 min Acceleration 1 Acceleration is the rate at which _____ changes. Acceleration 1 Acceleration is the rate at which velocity changes. Acceleration 2 The units of acceleration are __________ Acceleration 2 The units of acceleration 2 are m/s Acceleration 3 Acceleration caused by uniform circular motion is called ___________ acceleration. Acceleration 3 Acceleration caused by uniform circular motion is called centripetal acceleration. Acceleration 4 A sports car can accelerate from 0 to 60 in 6 seconds. If 60 mi/h is equal to 27 m/s, what is the sports car’s average acceleration? Acceleration 4 A sports car can accelerate from 0 to 60 in seconds. If 60 mi/h is equal to 27 m/s, what is the sports car’s average acceleration? a = vf – vi t 27 – 0 m/s 2 6 s = 4/5 m/s Acceleration 5 If a bicycle has an average 2 acceleration of -0.44 m/s with and initial forward velocity of 8.2 m/s, how long will it take to come to a stop? Acceleration 5 If a bicycle has an average acceleration of -0.44 m/s2 with and initial forward velocity of 8.2 m/s, how long will it take to come to a stop? t = vf – vi a t = 0 – 8.2 m/s -0.44 m/s2 = 18.63 s Force 1 A _______ is a push or a pull Force 1 A Force is a push or a pull Force 2 Forces that are equal in size, but opposite in direction are called _______ forces Force 2 Forces that are equal in size, but opposite in direction are called balanced forces Force 3 The _____ force is the sum of all the forces acting on an object. Force 3 The net force is the sum of all the forces acting on an object. Force 4 If the net force is unbalanced, the object will _________ in the direction of the net force. Force 4 If the net force is unbalanced, the object will accelerate in the direction of the net force. Force 5 Calculate the resultant force for the following. Force 5 Calculate the resultant force for the following. Friction 1 ______ _______is a force that opposes motion between two moving objects that are touching. Friction 1 Kinetic friction is a force that opposes motion between two moving objects that are touching. Friction 2 Which type of friction exerts the smallest opposing force on a moving body? Friction 2 Which type of friction exerts the smallest opposing force on a moving body? Rolling friction Friction 3 Frictional forces always act in what direction? Friction 3 Frictional forces always act in what direction? Opposite the direction of motion Friction 4 A sky diver uses a parachute to float to earth slowly and safely. This is an example of what type of kinetic friction? Friction 4 A sky diver uses a parachute to float to earth slowly and safely. This is an example of what type of kinetic friction? Fluid friction or air resistance Friction 5 If the box is NOT moving down the ramp, what is the force of static friction exerted on the box? Friction 5 If the box is NOT moving down the ramp, what is the force of static friction exerted on the box?