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Slide 2 8 th Science Force, Motion, and Energy Slide 3 A:B: ForceWeight C:D: AccelerationVelocity #1 What is speed plus direction? Example: Geese fly about 64 km/hr when they migrate south. Slide 4 D. Velocity Slide 5 A:B: ForceWeight C:D: AccelerationAir resistance #2 A push or pull. Slide 6 A. Force Slide 7 A:B: AccelerationAir resistance C:D: FrictionInertia 2 #3 What is a change in motion? (Speeding up, slowing down, changing direction). Example: An airplane slows down at a rate of 3 m/s Slide 8 A. Acceleration Slide 9 A:B: It takes energy to make force Force causes motion #4 What is the relationship between force, motion, and energy? C:D: NeitherBoth Slide 10 D. Both A and B Slide 11 A:B: Air resistanceFriction #5 A force that resists motion. C:D: InertiaForce Slide 12 B. Friction Slide 13 A:B: Air resistanceInertia C:D: ForceNewton #6 A measure of an objects tendency to remain at rest or to keep moving with a constant velocity. Slide 14 B. Inertia Slide 15 A:B: One of the forces is stronger than the other Both forces are equal C:D: Unbalanced forces cancel each other out, so there is no change Force #7 Forces occur in pairs and each pair of forces can be either balanced or unbalanced. How can an unbalanced force change the speed or direction of an object in motion? Slide 16 A. One of the forces is stronger than the other Slide 17 A:B: NewtonsMeters #8 Which unit measures the Unit of Force? C:D: Secondsm/s 2 Slide 18 A. Newtons Slide 19 A:B: Law 1 Law of InertiaLaw 2 Law of Acceleration C:D: Law 3 Law of Action and Reaction Law 4 Law of Conservation #9 An object a rest remains at rest and an object in motion remains in motion at a constant speed unless acted upon by a unbalanced force. Ex: Seat belt Ex: pulling the table cloth out from under dishes Slide 20 A.Law 1 Law of Inertia Slide 21 A:B: Law 1 Law of InertiaLaw 2 Law of Acceleration C:D: Law 3 Law of Action and Reaction Law 4 Law of Conservation #10 An object acted on by an unbalanced force will accelerate in the direction of the force. *(More force is required to move more mass.) Ex: It takes more force to move a car than a bicycle Slide 22 B. Law 2 Law of Acceleration Slide 23 A:B: Law 1 Law of InertiaLaw 2 Law of Acceleration C:D: Law 3 Law of Action and Reaction Law 4 Law of Conservation #11 Every action has an equal and opposite reaction. Ex: Rocket launching. Slide 24 C. Law 3 Law of Action and Reaction Slide 25 A:B: S = 38 km/hrS = 38 hrs #12 Measure Speed What is your speed if you travel 114 km in 3 hours? Speed = Distance Time C:D: S = 38 kmS = 3 km/hr Slide 26 A. S = 38 km/hr Slide 27 A:B: F = 180 kgF = 180 N #13 Measure Force What force is needed to make a 36 kg object accelerate to 5 m/s ? Force = mass x acceleration C:D: F = 108 NF = 180 m/s 2 2 Slide 28 B. F = 180 N Slide 29 A:B: W = 300 NW = 300 M #14 How does force effect work? Work = Force x Distance (if no distance, no work) How much work would it take to move a 50 N box over 6 meters? C:D: W = 300 jW = 300 km Slide 30 C. 300 j Slide 31 A:B: They dont change force or work They increase force or work C:D: They decrease force or distance None of these #15 How do simple machines effect force or distance? Slide 32 C. They decrease force or distance Slide 33 A:B: There is no force or gravity There is no friction or gravity C:D: There is no friction or newton There is no weight or mass #16 Why can a spacecraft travel in space at a constant speed and in a straight path? Slide 34 B. There is no friction or gravity Slide 35 A:B: Box will move to the left 6N Box will move to the right 6 N C:D: The force is balanced None of these #17 Calculating net force. What would be the net force in this diagram? 16N 10N = 6N Slide 36 A. Box will move to the left 6N Slide 37 A:B: 150m/s 250m/s C:D: 1400m/s None of these #18 This graph relates distance to time for a jogger. Distance vs. Time At what rate of speed is Juan running between 4 min and 6 min? S= 500m/2min Slide 38 B. 250m/s Slide 39 A:B: Stopped Ran faster C:D: Jogging slower None of these #19 This graph relates distance to time for a jogger. Distance vs. Time What can you tell about Juans motion between 7 and 11 min? Slide 40 A. Stopped Slide 41 A:B: Light energy to chemical energy to electrical energy Sound energy to light energy to chemical energy C:D: Chemical energy to electrical energy to light energy None of these #20 *Energy transfer from one form to another. List, in order, three of the energy conversions that are present in this picture. Slide 42 C. Chemical energy to electrical energy to light energy Slide 43 A:B: No energy is disappears. Energy is just changed to another form Not all energy must be converted C:D: Both of these None of these #21 The Law of conservation of change states that matter cannot be created or destroyed. How does the Law of Conservation of Change apply to a flashlight? Slide 44 A. No energy is disappears. Energy is just changed to another form Slide 45 A:B: Motion energyStored energy #22 What is potential energy? C:D: Electrical energyNone of these Slide 46 B. Stored energy Slide 47 A:B: Motion energyStored energy #23 What is kinetic energy? C:D: Electrical energyNone of these Slide 48 A. Motion energy Slide 49 A:B: Energy can convert from kinetic to potential and back again They are not related C:D: Both are energy in motion None of these #24 How are potential energy and kinetic energy related? Slide 50 A. Energy can convert from kinetic to potential and back again Slide 51 A:B: Graph A Graph B C:D: Graph CNone of these #25 Which of these graphs shows a speed that is not changing (constant speed) Slide 52 C. Graph C Slide 53 Great Job!!!! Great Job!!!! Thank you for playing! Thank you for playing!