 # Forces Motion Test 1 Review A push or

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Download presentation Forces & Motion – Test 1 Review A push or pull that acts on an object force A change in a moving object’s speed or direction acceleration A measure that does not change when an object’s location changes Reference point The measure of gravitational force exerted on an object weight Speed of an object in a particular direction velocity Distance an object moved over the time in which the motion took place speed The SI unit force newton The combination of all forces acting on an object Net force To calculate an object’s acceleration, what formula would you use? Acceleration = Vf – Vi time What is the net force on an object when you combine a force of 10 N north with a force of 5 N south 5 N north Distance time speed What is the difference between speed and velocity? Velocity is in a certain direction, speed is not To produce a change in motion, a force must be ______ unbalanced When the net force is equal to 0 N, the forces are _____ balanced ______ forces always cause a change in speed, direction, or both unbalanced Does a force applied always cause motion? No – only if the force is unbalanced Forces always come in ____ pairs It takes 5 seconds for a dog to run 80 meters. What is it’s speed? 16 m/s A pig runs 84 meters in 7 seconds. What is it’s speed? 12 m/s A track star runs the 100 meter dash in 10 seconds. What is his speed? 10 m/s A crocodile moves 18 meters, and is traveling at 6 m/s. How long did it take him? 3 seconds A plane traveled for 2. 5 hours at a velocity of 1200 km/hr. What distance did it travel? 3000 km A plane taking off reaches it’s takeoff velocity of 75 m/s after 5 seconds. What is it’s acceleration? 15 m/s/s A ball rolling down a hill accelerates from 3 m/s to 34. 5 m/s in 9 seconds. What is it’s acceleration? 3. 5 m/s/s If a ball is dropped and falls for 10 seconds, how fast will it be going? 98 m/s/s A car rolls down a hill for 6 seconds – if the car was going 20 m/s at the beginning of the hill, what is it’s final velocity? 78. 5 m/s