Physics Jeopardy Free Body Diagrams 1st law2nd law Mix Up Q $100 Q $200 Q $300 Q $400 Q $500 Q $100 Q $200 Q $300 Q $400 Q $500 Final Jeopardy

$100 Free Body Diagrams Draw the net force acting on a box if the box is traveling at a constant velocity.

$100 Answer Free Body Diagrams

$200 Free Body Diagrams What is the net force on a 18 kg cat if it is falling out of a tree?

$200 Answer Free Body Diagrams 180 N (This is a very fat cat)

$300 Free Body Diagrams What is the net force acting on a 40 kg box that is being pulled from the right with a force of 70 N and to the left with a force of 20 N.

$300 Answer Free Body Diagrams 400 N 70 N 20 N Fnet = 50 N right

$400 Free Body Diagrams What is the net force on a 10 kg box if it is being dragged to the left with a force of 30 N and there is a 12 N frictional force?

$400 Answer Free Body Diagrams 100 N 12 N 30 N Fnet = - 18 N

$500 Free Body Diagrams What is the acceleration on a 15 kg box that was sliding on ice at a constant velocity when it hits a patch of concrete that will provide a frictional force of 40 N?

$500 Answer Free Body Diagrams 150 N 40 N Fnet = -40 N Therefore, acceleration = m/s^2

$100 Question 1 st law Inertia is that property of mater that does what to a change in motion?

$100 Answer 1 st law Opposes a change in motion

$200 Question 1 st law The law of inertia states that an object_________. a)At rest will remain at rest unless acted on by an outside force. b)Will continue moving at the same velocity unless an outside force acts on it. c)Will continue moving in a straight line unless an outside force acts on it. d)That is not moving will never move unless a force acts on it. e)All of the above f)None of the above

$200 Answer 1 st law e) All of the above

$300 Question 1 st law When you bring an object with a certain amount of inertia from Earth to the Moon (which has less gravity), does it’s inertia increase or decrease?

$300 Answer 1 st law Stays the same

$400 Question 1 st law On the surface of Jupiter, the acceleration due to gravity is about 3 times that of Earth. What would be the mass of a 120 kg rock on Jupiter?

$400 Answer 1 st law M = 120 kg

$500 Question 1 st law What is the resultant of a 5.0 N force acting vertically upward and a 3.0 N force acting horizontally?

$500 Answer 1 st law F = 5.8 N

$100 Question 2 nd law A person weighs 500 N. What is the mass of the person?

$100 Answer 2 nd law m = 50 kg

$200 Question 2 nd law A rock is thrown vertically into the air. At the very top of its trajectory the net force on it is _________. a)Less than its weight b)More than its weight c)Its weight

$200 Answer 2 nd law c) Its weight

$300 Question 2 nd law You push with 20 N on a 10 kg block on a frictionless surface. How fast will the block accelerate?

$300 Answer 2 nd law a = 2 m/s^2

$400 Question 2 nd law Suppose a cart is being moved by a force. If suddenly a load is dumped into the cart so that the cart’s mass doubles, what happens to the cart’s acceleration? a)It quadruples b)It doubles c)It halves d)It quarters e)It stays the same

$400 Answer 2 nd law c) It halves

$500 Question 2 nd law You push with 60 N on a 10 kg block and there is a 20 N force of friction. How fast will the block accelerate?

$500 Answer 2 nd law a) = 4 m/s^s

$100 Question Mix Up 1 The mass of a dog that weighs 100 N is about _______.

$100 Answer Mix Up 1 m = 10 kg

$200 Question Mix Up 1 After a cannon ball is fired into frictionless space, the amount of force needed to keep it going equals _______. a)Twice the force with which it was fired. b)The same amount of force with which it was fired c)One half the force with which it was fired. d)On quarter the force with which it was fired. e)Zero, since no force is necessary to keep it moving

$200 Answer Mix Up 1 e) Zero, since no force is necessary to keep it moving

$300 Question Mix Up 1 What is the maximum resultant possible when adding a 3 N force to an 8 N force?

$300 Answer Mix Up 1 maximum resultant is 11 N

$400 Question Mix Up 1 On the moon, the acceleration due to gravity is 1/6 that on Earth. What would be the weight of a 0.10 kg of salami on the moon?

$400 Answer Mix Up 1 F = 0.17 N

$500 Question Mix Up 1 A certain unbalanced force gives a 5 kg object an acceleration of 2 m/s^2. What acceleration would the same force give a 30 kg object?

$500 Answer Mix Up 1 a =.33 m/s^2

$100 Question Mix Up 2 Accelerations are produced by __________. a)Velocities b)Accelerations c)Forces d)Masses e)None of the above

$100 Answer Mix Up 2 c) forces

$200 Question Mix Up 2 Suppose a particle is accelerated through space by a constant 10 N force. Suddenly the particle encounters a second force of 10 N in a direction opposite to that of the first force. The particle _________. a)Is brought to a rapid halt b)Gradually decelerates to a halt c)Continues at the speed it had when it encountered the second force d)Theoretically accelerates to speeds approaching the speed of light e)None of the above

$200 Answer Mix Up 2 c) Continues at the speed it had when it encountered the second force.

$300 Question Mix Up 2 How fast will a ball be falling if you throw it downward at a velocity of 8 m/s and it falls for 4 seconds?

$300 Answer Mix Up 2 v = -48 m/s

$400 Question Mix Up 2 How long does it take for a rock to fall a distance of 75 meters?

$400 Answer Mix Up 2 t = 3.87 s

$500 Question Mix Up 2 If you apply a forward force to a 1200 kg car of 600 N and there is a frictional force of 70 N, how fast will the car be going after 5 seconds if you start pushing it from rest?

$500 Answer Mix Up 2 v = 2.2 m/s

Final Jeopardy A net force of 1.0 N acts on a 2.0 kg object, initially at rest, for 2 seconds. What is the distance the object moves during that time?

Final Jeopardy Answer 1 meter