6. Intro to Forces (Dynamics)
Types Of Forces & Free Body Diagrams
6. Intro to Forces (Dynamics)
Types Of Forces & Free Body Diagrams
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- Multiple Choice
A tire swing hangs from a tree branch by a rope. Identify all the forces acting on the tire.
- Multiple Choice
You push a couch across a carpeted (rough) living room floor. Identify all the forces acting on the couch.
- Multiple ChoiceThe figure shows all the forces acting on an object. Which arrow could represent the acceleration of that object?
- Multiple ChoiceThe figure shows all the forces acting on an object. What can you tell about the velocity of the object at this instant?
- Open QuestionA ball is hanging from a long string that is tied to the ceiling of a train car traveling eastward on horizontal tracks. An observer inside the train car sees the ball hang motionless. Draw a clearly labeled free-body diagram for the ball if (b) the train is speeding up uniformly. Is the net force on the ball zero in either case? Explain.
- Open QuestionCrates A and B sit at rest side by side on a frictionless horizontal surface. They have masses mA and mB, respectively. When a horizontal force F is applied to crate A, the two crates move off to the right. (a) Draw clearly labeled free-body diagrams for crate A and for crate B. Indicate which pairs of forces, if any, are third-law action–reaction pairs.
- Open Question
(I) A 650-N force acts in a northwesterly direction. A second 650-N force must be exerted in what direction so that the resultant of the two forces points westward? Illustrate your answer with a vector diagram.
- Open QuestionA 1130-kg car is held in place by a light cable on a very smooth (frictionless) ramp (Fig. E5.8). The cable makes an angle of 31.0° above the surface of the ramp, and the ramp itself rises at 25.0° above the horizontal. (a) Draw a free-body diagram for the car.