Concept explainers
One of your classmates drew a force diagram for a pendulum bob at the bottom of its swing He put a horizontal force arrow in the direction of the velocity. Evaluate his diagram by choosing from the statements below.
a. He is incorrect since the force should point partly forward and tilt partly down.
b. He is incorrect since there are no forces in the direction of the object’s velocity.
c. He is correct since any moving object has a force in the direction of its velocity.
d. He is correct but he also needs to add an outward (down) force.
Want to see the full answer?
Check out a sample textbook solutionChapter 5 Solutions
College Physics
Additional Science Textbook Solutions
Cosmic Perspective Fundamentals
Sears And Zemansky's University Physics With Modern Physics
Physics: Principles with Applications
Applied Physics (11th Edition)
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
Physics (5th Edition)
- 14. It is a drawing of an object in which the object is isolated from its surroundings and the external forces acting on the object are shown. graphical representation concurrent force system free-body diagram 30 force system 15. A system of forces on a body which has no resultant. free body diagram equilibrium coplanar force 16. The scalar product of two vectors is sometimes known as: dot product cross product O resultantarrow_forwardThe simply supported beam in Figure Q2a is in equilibrium and the reaction force RA is 9.92 N. Determine the reaction force at RB and calculate the distance x m. *Assume that the weight of the beam is zero.arrow_forwardA 120 N is at rest on a rough in a line making an angle of 20° with the horizontal. The roller has a radius of 0.40 m. as indicated in the figure.a. Calculate the force P that is required to push the roller at rest on the rough incline surface.b. Calculate the normal reaction at the point of contact between the roller and the rough inclined surface.c. Calculate the force P required to pull the roller at rest on the rough incline surface.arrow_forward
- Two masses M, and M, are attached to different springs as shown in the adjacent figure. The upper spring has spring constant k, and extension X,. Also, the lower spring has spring constant k, and extension X,. If the two springs are of negligible masses and the adjacent setup is at static equilibrium, then X, is given by: A. M1g/k1 B. (M,+M2)g/k2 C. M2g/k2 D. (M,+M2)g/k1 E. (M,+M2)g/(ki+ k2) K1, X1 M1 K2, X2 M2arrow_forwardLearning Goal: To understand how to quantitatively determine whether a particle is in a state of mechanical equilibrium. As shown, three forces, F1, F2, and F3, act at the same point on an object. (Figure 2) The point of application is the origin of a Cartesian coordinate system. F1, which has a magnitude of F1 = 20.0 kN , is in the y-z plane and is described by an angle B1 = 34.0 degrees . F2 is in the x-z plane and is described by integer lengths of a similar right triangle; its magnitude is F2 = 25.0 kN. If the sum of the forces is equal to zero, what is the magnitude of F3? Express your answer numerically in kilonewtons to three significant figures. In statics, we make extensive use of Newton's first law, which states that a particle, initially at rest, or moving in a straight line with constant velocity, will remain in its current state unless the particle is subjected to an unbalanced force system. If the sum of the forces acting on a particle is zero, then it is in mechanical…arrow_forward77 K/s l A:0. docs.google.com/forms Sove tne peiow question ana then seiect the correct answer Sam pushes toward the right on a box with a force of magnitude 31.0 N. Sarah applies an 11.0 N force on the box in the opposite direction. The magnitude of the kinetic friction force between the box and the very smooth floor is 4.50 N as the box slides toward the right. Also, the magnitude of the normal force is 98 N. Find the box's mass, the box's acceleration in the x-direction, the box's acceleration in the y-direction, and the coefficient of dynamic friction. Choose the correct answers * m = 10 kg, a, = 2.55 m/s?, a, = 0 m/s?,p = 0.5 العربية الإنجليزيةarrow_forward
- Replace the force-couple system at point O by a single force. Specify the coordinate ya of the point on the y-axis through which the line of action of this resultant force passes. 350 N 185 N-m Answer: yA" iarrow_forwardChapter 04, Problem 054 The steel I-beam in the drawing has a weight of 9.00 × 103 N and is being lifted at a constant velocity. What is the tension in each cable attached to its ends? 70.0° 70.0° I-beam ith no attempts available. Units the tolerance is +/-2% Click if you would like to Show Work for this question: Open Show Workarrow_forwardA education.wiley.com 4 (Chapters 6 - 7) ework 4 (Chapters 6 - 7) NWP Assessment Player UI Application Question 5 of 10 View Policies -/1 E Current Attempt in Progress Consult Conceptual Example 9 in preparation for this problem. The drawing shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters the water at a speed of 19.7 m/s via path 1. How fast is he moving on path 2 when he releases the rope at a height of 2.01 m above the water? Ignore the effects of air resistance. Path 2 Number i Units eTextbook and Media Attempts: 0 of 5 used Submit Answe Save for Later MacBook Air DD F10 F9 F8 888 F7 80 F6 F5 F4 F3 * & %24 7 8 9 4. P 5arrow_forward
- Jadon is 5 years old and weighs 45.0 pounds. He is sitting on a swing when his cousinAllison pulls him and the swing back horizontally through an angle of 35.08 and thenstops. Find the magnitude of the force exerted by Allison a. 31.5 lb b. 64.3 lb c. 25.8 lb d. 36.9 lbarrow_forwardA student releases a system on an incline as shown. The coefficient of friction of static friction between the 20kg box and the surface is 0.28 and the coefficient of kinetic friction is 0.16. Neglect drag. What is the magnitude of maximum static friction between the block and the surface in this situation? 47.1 What direction is the friction on the 20kg block? 20kg up-left What direction will the 20kg block slide? 7.6kg neither What is the magnitude of the friction? 31" What is the magnitude of the net force on the system? unit What is the magnitude of the system's acceleration? unit What is the tension in the string? unit GURLA STAR check answersarrow_forwardconsider a bent rod supported by a roller at A and a pin at C and is acted upon by a downward force P = 50N. B. 30° 4. Which of the following force diagrams correctly shows the reactions at the supports? A B. 30° D B. B.arrow_forward
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
- University Physics Volume 1PhysicsISBN:9781938168277Author:William Moebs, Samuel J. Ling, Jeff SannyPublisher:OpenStax - Rice University