Newtons Laws Review

Science CBA #2 ReviewForce and MotionWhat is motion?

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

VelocityVelocity has speed and direction.

Velocity = distance + direction timeDisplacementDisplacement 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? __________ ___A bike rider biked 50 km North and 30 km South. What is the displacement?What is the total distance? __________ ___What is the displacement? __________ ___#1 VelocityLater 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#1 Velocity Answerd = 60 m SWt = 20 secv = ?

v = 60 m SW 20 sec

v = 3 m/sec/SWSpeedThe distance an object travels in a certain amount of time.

Average speed Total distance divided by total timeConstant speed - Speed that does not change What is the formula for calculating speed?Speed equals distance divided by time.Speed = Distance Time

Create the triangle Speed ProblemA 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? Speed Problem AnswerSpeed = Distance TimeSpeed = 100 m 20 sSpeed = 5m/sAccelerationA change in the direction or speed (velocity) of an object over time which may be:-A change in speedStartingStoppingSpeeding up (positive acceleration)Slowing down (negative acceleration)-A change in directionAcceleration is caused by unbalanced forcesUnit for Accelerationm/s sUnit for Accelerationkm/hr sIf a car is moving on a road at 70 km/hrgoing due north, and then changesdirection and starts traveling northeaststaying at 70 km/hr, what happens to itsspeed and velocity?

A The speed of the car changes, but thevelocity stays the same.B The velocity of the car changes, butthe speed stays the same.C Both the speed and velocity of the carchange.D Neither the speed nor the velocity ofthe car changes.A 2000 kg truck and a 500 kg car areracing. The same amount of force isapplied to each of them. What willhappen?

A The truck will accelerate twice asfast.B The car will accelerate twice as fast.C The truck will accelerate four times asfast.D The car will accelerate four times asfast.Martin gathered a toy car, a ramp, astopwatch, a meter stick, and a variety ofweights. What is he likely testing?

A how the angle of a ramp affects thespeed of the carB how friction affects the speed of thecarC how equal forces work on theplacement of the car and the rampD how mass affects the speed of the carPracticeWhat is the speed of a train that runs 4200 km in 21 hours?

s=d/tPractices= 4200/21

s= 200 km/hr PracticeTwo people head 60 meters southwest and it took them 20 seconds. What is their velocity

v= distance+ directions------------------------------------time*remember velocity is speed and directionPracticed= 60 m swt= 20 secs=?

v= 60/ 20

v= 30 m/s swForceThe 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

Forces are measured in NewtonsSymbol: NMeasured 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. Net ForceNet Force: Net force is the sum of all the forces acting on an object

If 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 ------>