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.

You push a couch across a carpeted (rough) living room floor. Identify all the forces acting on the couch.

The figure shows all the forces acting on an object. Which arrow could represent the acceleration of that object?

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Multiple Choice

The figure shows all the forces acting on an object. What can you tell about the velocity of the object at this instant?

20 kg

crate across a horizontal floor with a rope angled 30° above the horizontal. The coefficients of kinetic and static friction are 0.2 and 0.3 respectively. If the crate is moving at a constant speed, what is the tension in the rope?

A 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.

Crates 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.

(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.

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Textbook Question

A 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.

Newton's First Law Exercises 17, 18, and 19 show two of the three forces acting on an object in equilibrium. Redraw the diagram, showing all three forces. Label the third force F3.

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Textbook Question

Exercises 23, 24, 25, 26, and 27 describe a situation. For each, identify all forces acting on the object and draw a free-body diagram of the object. An ice hockey puck glides across frictionless ice.

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Textbook Question

Exercises 23, 24, 25, 26, and 27 describe a situation. For each, identify all forces acting on the object and draw a free-body diagram of the object. Your physics textbook is sliding across the table.

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Textbook Question

A baseball player is sliding into second base. Identify the forces on the baseball player.

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Textbook Question

A rubber ball bounces. We'd like to understand how the ball bounces. c. Draw a free-body diagram of the ball during its contact with the ground. Is there a net force acting on the ball? If so, in which direction?

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Textbook Question

A chandelier hangs from a chain in the middle of a dining room. Identify the forces on the chandelier.

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Textbook Question

A jet plane is speeding down the runway during takeoff. Air resistance is not negligible. Identify the forces on the jet.

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Textbook Question

Problems 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, and 52 describe a situation. For each, draw a motion diagram, a force-identification diagram, and a free-body diagram. A Styrofoam ball has just been shot straight up. Air resistance is not negligible.

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Textbook Question

Problems 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, and 52 describe a situation. For each, draw a motion diagram, a force-identification diagram, and a free-body diagram. A rocket is being launched straight up. Air resistance is not negligible.

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Textbook Question

Problems 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, and 52 describe a situation. For each, draw a motion diagram, a force-identification diagram, and a free-body diagram. A model rocket is fired straight down from the top of a tower.

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Textbook Question

Newton's First Law Exercises 17, 18, and 19 show two of the three forces acting on an object in equilibrium. Redraw the diagram, showing all three forces. Label the third force F3.

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Textbook Question

A heavy steel cable attached to a motor is lifting a girder. The girder is speeding up.(a) Draw an interaction diagram

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Textbook Question

Block A in FIGURE EX7.4 is sliding down the incline. The rope is massless, and the massless pulley turns on frictionless bearings, but the surface is not frictionless. The rope and the pulley are among the interacting objects, but you'll have to decide if they're part of the system. (a) Draw an interaction diagram

(I) Sketch the free-body diagram of a baseball

(a) at the moment it is hit by the bat, and again

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Textbook Question

(I) Sketch the free-body diagram of a baseball

(b) after it has left the bat and is flying toward the outfield. Ignore air resistance.

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Textbook Question

(II) A uniform rod AB of length 4.5 m and mass M = 3.8 kg is hinged at A and held in equilibrium by a light cord, as shown in Fig. 12–69. A load W = 22 N hangs from the rod at a distance d so that the tension in the cord is 85 N.

(a) Draw a free-body diagram for the rod.

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Textbook Question

(III) A block of mass m slides along a horizontal surface lubricated with a thick oil which provides a drag force proportional to the square root of velocity:

F_D = -bv 1/2

If v = v₀ at t = 0 , determine v and x as functions of time.

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Showing 27 of 27 practice

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6. Intro to Forces (Dynamics)

Types Of Forces & Free Body Diagrams

Learn with Patrick

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Practice this topic