What is motion? Motion is when an object changes its position. Motion can be represented mathematically through calculations of speed, velocity, and acceleration.

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Slide 2 What is motion? Motion is when an object changes its position. Motion can be represented mathematically through calculations of speed, velocity, and acceleration Motion is when an object changes its position. Slide 3 Velocity has speed and direction. Velocity = distance + direction time Slide 4 Displacement is the distance and direction between the starting and ending position. A car moved 60 km East and 90 km West. What is the distance? What is the total distance? __________ ___ What is the displacement? __________ ___ Slide 5 A bike rider biked 50 km North and 30 km South. What is the displacement? What is the total distance? __________ ___ What is the displacement? __________ ___ Slide 6 Later that day, they decided to work on their fitness and go run the track. They headed 60 meters southwest from their rooms to the track which took them 20 seconds. What is their velocity? v = d+direction t Slide 7 d = 60 m SW t = 20 sec v = ? v = 60 m SW 20 sec v = 3 m/sec/SW Slide 8 The distance an object travels in a certain amount of time. Average speed Total distance divided by total time Constant speed - Speed that does not change Slide 9 Speed equals distance divided by time. Speed = Distance Time Create the triangle Slide 10 A football field is about 100 meters long. If it takes a person 20 seconds to run its length, how fast was the football player running? Slide 11 Speed = Distance Time Speed = 100 m 20 s Speed = 5m/s Slide 12 A change in the direction or speed (velocity) of an object over time which may be: -A change in speed Starting Stopping Speeding up (positive acceleration) Slowing down (negative acceleration) -A change in direction Acceleration is caused by unbalanced forces Slide 13 m/s s Unit for Acceleration km/hr s Slide 14 If a car is moving on a road at 70 km/hr going due north, and then changes direction and starts traveling northeast staying at 70 km/hr, what happens to its speed and velocity? A The speed of the car changes, but the velocity stays the same. B The velocity of the car changes, but the speed stays the same. C Both the speed and velocity of the car change. D Neither the speed nor the velocity of the car changes. Slide 15 A 2000 kg truck and a 500 kg car are racing. The same amount of force is applied to each of them. What will happen? A The truck will accelerate twice as fast. B The car will accelerate twice as fast. C The truck will accelerate four times as fast. D The car will accelerate four times as fast. Slide 16 Martin gathered a toy car, a ramp, a stopwatch, a meter stick, and a variety of weights. What is he likely testing? A how the angle of a ramp affects the speed of the car B how friction affects the speed of the car C how equal forces work on the placement of the car and the ramp D how mass affects the speed of the car Slide 17 What is the speed of a train that runs 4200 km in 21 hours? s=d/t Slide 18 s= 4200/21 s= 200 km/hr Slide 19 Two people head 60 meters southwest and it took them 20 seconds. What is their velocity v= distance+ directions ------------------------------------ time *remember velocity is speed and direction Slide 20 d= 60 m sw t= 20 sec s=? v= 60/ 20 v= 30 m/s sw Slide 21 The cause of motion (what causes objects to move) Force has four components: push, pull, size, and direction Force always come in pairs. Its impossible to have only one force Slide 22 Symbol: N Measured by using a spring scale What is a newton? A newton is a force required to accelerate a one kg mass at a rate of one m/s2. Slide 23 Net Force: Net force is the sum of all the forces acting on an objectIf the forces are in the SAME direction, then you add them together. 5 N --------> 5 N----------->If the forces are in opposite directions then you subtract the smaller force from the larger force. 10 N ------>