Physics Force & Laws Of Motion Level: Misc Level
In a collusion between two cars, which would you expect to be more dangerous to the occupants: if the cars collide and remain together or if the two cars rebound backwards from each other elastically?
Physics Force & Laws Of Motion Level: Misc Level
A box slides across the frictionless surface of a frozen lake. What happes to the speed of the box as water collects in it from the rain shower?
Physics Force & Laws Of Motion Level: Misc Level
A certain horse says, There s no use in trying to pull that cart. No matter how hard I pull on the cart, it will always pull back on me with exactly the same force. So I can never make it go Explain what is wrong with the horse s reasoning. ( Use free freebody diagrams, showing all the forces involved)I
Physics Force & Laws Of Motion Level: Misc Level
If an object is at rest, can we conclude that there are no external forces acting on it? Explain.
Physics Force & Laws Of Motion Level: Misc Level
Does a negative acceleration necessarily imply that a body is slowing down? What (or who ) determines the sign of the acceleration in a particular problem?
Physics Force & Laws Of Motion Level: Misc Level
A force of 250 N is applied to a hydraulic jack piston that is 0.01 m in diameter. If the piston which supports the load has a diameter of 0.10 m, approximately how much mass can be lifted by the force? Ignore any difference in height between the pistons.
Physics Force & Laws Of Motion Level: Misc Level
A woman is enjoying a tropical drink while lying on a beach. The acceleration due to gravity at her location is 9.85 m\s2 What gauge pressure must exist in the woman s mouth if she is drinking through a straw extending 0.085 m above the surface of the drink? Note assume the drink has a density of 1015 kg \m3
Physics Force & Laws Of Motion Level: Misc Level
A submarine is operating at 100. 0m below the surface of the ocean. If the air inside the submarine is maintained at a pressure of 1.0 atmosphere, what is the magnitude of the force that acts on the rectangular hatch 2.0 x 1.0 m on the deck of the submarine?
Physics Force & Laws Of Motion Level: Misc Level
An ice cube, p = 917 kg / m3 , is sliding down a frictionless incline as shown in the drawing The sides of the cube each have a length of 0. 75 m. What pressure does the cube exert on the incline?
Physics Force & Laws Of Motion Level: Misc Level
A 2 - kg block lies on top of a 5 - kg block which is at rest on a horizontal surface. A horizontal, unstretched spring ( k= 45 N /m) is attached to the top block and to the wall. The coefficient of kinetic friction between the two blocks and the surface is 0.25 and the coefficient of static friction between the two blocks is 0.45. A horizontal force is applied to the bottom block that keeps the blocks moving with constant velocity. By what distance is the spring compressed when the top block begins to slide? What is the magnitude of the applied force at the moment?
Physics Force & Laws Of Motion Level: Misc Level
A 5 - kg mass is attached to the end of a spring ( k = 225 N/m). The mass is allowed to pull a distance A to the right of the equilibrium position and then released. The mass is allowed to move without friction.Five seconds after the mass is released, it is located at a distance of 0. 105 m to the left of the equilibrium position.
a) Find A.
b.) What is the maximum acceleration of the mass?
c.)find the period of oscillations.
d.) What is the velocity of the mass 2. 5 seconds after the mass is released?
Physics Force & Laws Of Motion Level: Misc Level
A 10 000 kg bridge of length 10 m is supported at both ends. If a 2000 kg car is parked on the bridge 3. 0 m from the left support, what are the supporting forces at the left and right ends?
Physics Force & Laws Of Motion Level: Misc Level
An 82. 0 kg painter stands on a long horizontal board 1.55 m from one end. The 15.5 kg board is 5.50 m long. The board is supported at each end.
(a) What is the total force provided by both supports?
(b) With what force does the support, closet to the painter, push upward?
Physics Force & Laws Of Motion Level: Misc Level
A chain hangs from the ceiling of an elevator with three links as shown:
a.Ring A and C each have about twice the mass of ring B. If the elevator is at rest, draw a force diagram for rings A, B, and C, In your drawing, circle those forces, which are Newton s 3 rd Law pairs.
Now say the elevator accelerates upward. Would your diagram for B be any different? If no explain why not. If yes, explain how it would change.
c. If the mass of A is 10 kg and the elevator accelerates upward with a = 2. 0 m/sec2, calculate the force of that ring A exerts on B.
Physics Force & Laws Of Motion Level: Misc Level
You fire three shots from your gun (lets label the shots A, B, & C). one straight up (A), one straight down (B), and one horizontally (C). Assuming that you shoot from the hip (i. e. your hand is in the same place each time, right by your holster) and you ignore air resistance.
a. Which of the three bullets (A, B, or c ) will have the greatest speed as it reaches the ground?
b. Now include air resistance, how does your answer change and why?
