Survey
* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project
Download unit review - TeacherWeb
Document related concepts
no text concepts found
Transcript
Newton’s Laws of Motion: Review Chapters 4-6 November 9/10 Question • When a balloon deflates, the balloon pushes on the air and _______. Answer • The air pushes on the balloon Question • Object one has twice as much mass as another object. Object one also has twice as much _____ Answer • Inertia Questions • When all the forces acting on an object are balanced and the net force is zero, the object is said to be in ___________. Answer • Equilibrium Questions • Accelerations are produced by Answer • Forces Question • A book weighs 4 N. When held at rest in your hands, the net force on the book is ____. Answer • Zero Question • Which has a greater mass, a kilogram of feathers or a kilogram of steel? Answer • The both have the same mass, 1 kg Question • As a ball falls, the action force is the pull of Earth's mass on the ball. What is the reaction to this force? Answer • The pull of the ball’s mass on the Earth Question • The outside force that often slows objects down or stops their motion is ___. Answer • Friction Question • If you push off the ground with a force of 500 N when you jump upward, what force pushes Earth downward? Answer • 500 N according the rd Newton’s 3 law Question • What is the pressure exerted on a table by a book that weighs 35 N and covers an 2 area of 3 m ? Answer Known F = 35 N A = 3 m2 Unknown P Equation P=F A Solve P = 35 N 3m2 P = 11.67 N/m2 or 11.67 Pa Questions- honors • With what acceleration does an 65 kg box move if it is pushed 155 N? Answer Known m = 65 kg F = 155 N Unknown a=? Equation F = ma Solve F = ma 155N = (65kg)a 155 = (65kg)a 65kg 65kg 2.38 m/s2 Question • A dog walks on a street. What is the force of friction between the 225 N dog and the street that has a coefficient of friction of 0.26? Answer Known w = 225 N = FN µ = 0.26 Solve Ff = µFN Ff = (0.26)(225N) Unknown Ff = ? Ff = 58.5 N Equation Ff = µFN Question • Force and accelerations are ______________ proportional. Answer • Directly proportional –More force results in more acceleration Question • Mass and acceleration are __________________ proportional. Answer • Inversely proportional –More mass results in less acceleration –Less mass results in more acceleration Question • Pressure and Area are _______________ proportional. Answer • Inversely proportional –More area covered results in less pressure –Less area covered results in more pressure Question • Which has greater tangential speed, a horse near the outside rail of a merry-goround or a horse near the inside rail? Answer • The one on the outside because it has a larger radius Question • Which has greater rotational speed, a horse near the outside rail of a merry-goround or a horse near the inside rail? Answer • They both have the same rotational speed Question • According the Newton’s law of universal gravitation, what is the relationship between force and distance Answer • Inverse squared Questions • In what direction does centripetal force pull? Answer • Inward / toward the center of the circle Question • If centripetal force is taken away, what will happen to the object moving in the circle? Answer • The object will fly off tangent (in a straight line) Question The gravitational force between two massive spheres a. is always an attraction. b. depends on how massive they are. c. depends inversely on the square of the distances between them. d. all of the above Answer The gravitational force between two massive spheres a. is always an attraction. b. depends on how massive they are. c. depends inversely on the square of the distances between them. d. all of the above Question • Gravitational forces are the weakest forces found in nature. Because of this _____. a. the gravitational effect between a pencil and Earth cannot be seen b. there is no gravitational force between two 1kg masses c. gravitational forces that are easily observed involve one or more large masses d. there is no movement between two large masses located near each other in space Answer • Gravitational forces are the weakest forces found in nature. Because of this _____. a. the gravitational effect between a pencil and Earth cannot be seen b. there is no gravitational force between two 1kg masses c. gravitational forces that are easily observed involve one or more large masses d. there is no movement between two large masses located near each other in space
Related documents