Game Board Let’s Play Jeopardy

Game Board Force and Motion ForcesNewtonFree Body Diagrams Friction

Game Board Force 100 Describe the two types of forces and give an example. See Answer

Game Board Force 100 A Contact Force -push -pull Field Force -gravity -electrical -magnetic Contact Forces Frictional Force = Ffrict Tensional Force = Ftens Normal Force = Fnorm Air Resistance Force = Fair Applied Force = Fapp Spring Force= Fspring

Game Board Force 200 The fundamental units of Force Answer

Game Board Force 200 A N = kg x m/s 2

Game Board Force 300 Analyze the following scenario and give the forces involved: A car being pulled by a towing cable. Answer

Game Board Force 300A -Gravity -Normal -Friction -Applied (pull)

Game Board Force 400 Solve for the components of the net force on a 5 kg balloon moving upward at 2.0 m/s 2 at 25 o. Answer

Game Board Forces 400A Answer Fx = ma(cosθ) = 9.1N Fy = ma(sinθ) = 4.2 N

Game Board Force 500 Find the net force of the following diagram. Answer

Game Board Force 500A 20.6 N at South of East

Game Board Newton 100 Explain the cause of acceleration. Provide the law that explains this principle. Answer

Game Board Newton 100A Force Newton’s Second Law F=ma.

Game Board Newton 200 The term Newton uses in his first law to explain an objects tendency to maintain its state of motion. Answer

Game Board Newton 200A Inertia An object at rest stays in rest, an object in motion stays in motion, unless acted on by an unbalanced force.

Game Board Newton 300 A hammer drives a nail into a piece of wood. Identify the action-reaction pair in this situation. Which of Newton’s laws explains this situation? Answer

Game Board Newton 300 A The hammer exerts a force on the nail: the wood exerts a force on the wood. Newton’s 3 rd Law

Game Board Newton 400 As a basketball player starts to jump for a rebound, the player begins to move upward faster and faster until his shoes leave the floor. Describe the force of the floor on the shoes in relation to Fg at the moment the player begins to jump. Answer

Game Board Newton 400A Is greater than the player’s weight

Game Board Newton 500 A 1856 kg truck is moving to the right at a constant speed of 2.17 m/s 2. What is the net force on the car? What would it be if it were to move in the opposite direction. Answer

Game Board Newton 500 A Zero, at constant velocity the acceleration is zero. Therefore, the net force is zero regardless of the direction.

Game Board Free Body Diagrams 100 Describe three things that are represented in a free-body diagram. Answer

Game Board Free Body Diagrams 100A -the object -forces as vectors (magnitude and direction) -forces exerted on the object

Game Board Free Body Diagrams 200 Answer Create a diagram of a book is at rest on a table top.

Game Board Free Body Diagrams 200A In this diagram, there are normal and gravitational forces on the book.

Game Board Free Body Diagrams 300 A flying squirrel is gliding (no wing flaps) from a tree to the ground at constant velocity. Consider air resistance. A free body diagram for this situation looks like… Answer

Game Board Free Body Diagrams 300A Gravity pulls down on the squirrel while air resistance keeps the squirrel in the air for a while.

Game Board Free Body Diagrams 400 Answer Create a diagram for a car that runs out of gas and is coasting down a hill.

Game Board Free Body Diagrams 400A Even though the car is coasting down the hill, there is still the dragging friction of the road (left pointing arrow) as well as gravity and normal forces.

Game Board Free Body Diagrams 500 Answer A box is pulled across a surface at an angle, the box only moves in the x direction. Write the equations for the sum of the forces in the x and y directions in terms of the variables in the picture.

Game Board Free Body Diagrams 500A Fx =F t cosθ-F f = ma Fy = Fn+F t sinθ-Fg = 0 (no movement)

Game Board Friction 100 Compare Kinetic and Static friction. Answer

Game Board Friction 100A Kinetic friction is the frictional force of an object in motion. Static friction is the frictional force that keeps an object from moving, the minimum amount of force that must be applied for an object to have motion.

Game Board Friction 200 What is the unit of the coefficient of friction? Answer

Game Board Friction 200A μ does not have a unit because it is a ratio of the Force of friction and the normal force. Therefore, the units cancel out.

Game Board Friction 300 Answer What happens to air resistance when an object accelerates? Why is it considered a form of friction?

Game Board Friction 300 A In most cases, air resistance increases with increasing speed. Therefore, friction is a retarding force so it can be classified as friction because it is opposing or slowing down the motion.

Game Board Friction 400 Answer There are six books in a stack, each book weighs 5N. The coefficient of static friction between the books is 0.2. Determine what the horizontal force must be to begin sliding the top five books off the bottom one.

Game Board Friction 400A Fx = Fapp-Fs = 0 Fapp=Fs= μ Fn Fn = Fg Fg = 5 x 5N = 25N Fapp = (0.2) 25N = 5 N

Game Board Friction 500 Answer An ice skater moving at 10.0 m/s coasts to a halt in 1.0 x 10 2 m on a smooth ice surface. What is the coefficient of friction between the ice and the skates?

Game Board Friction 500A (1) Fx = Ff = ma (2) Fy = 0, Fn = Fg (3) Ff = μFn = μFg Fg = mg Ff = μmg = maEq (1) and (3) combined μmg = mam cancels out μg = a….so… μ = a/g Solve for a….a = -(vi) 2 /2∆x = m/s 2 μ = a/g = 0.50/9.81 = 0.051

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