COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 4, Problem 4QAP
To determine
The reason due to which the force that a horizontal surface exerts on an object at rest on the surface is called the normal force.
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Students have asked these similar questions
Consider the following statement: “The normal force on an object is always equal to the weight of the object.”Select all the reasons that this statement is false .
The normal force is not always parallel to the force of gravity
The normal force is independent of the force of gravity
The normal force is only equal to the weight of the object when sitting on a horizontal surface and there are no other forces in the y-direction except gravity
The normal force causes an acceleration and therefore does not interact with gravity
The normal force, that is applied by the surface, is always opposite of the weight of the object acting to the surface. True or False
When the astronaut enters the ISS (International Space Station), she is in "free
fall," where the only force acting on her is the force of gravity applied by the
Earth. What happens to her true weight and her apparent weight as she enters
the ISS? Explain. (You may want to reference p. 227-228 of the textbook to help
you.)
Chapter 4 Solutions
COLLEGE PHYSICS
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- For the woman being pulled forward on the toboggan in Figure 4.33, is the magnitude of the normal force exerted by the ground on the toboggan (a) equal to the total weight of the woman plus the toboggan, (b) greater than the total weight, (c) less than the total weight, or (d) possibly greater than or less than the total weight, depending on the size of the weight relative to the tension in the rope?arrow_forwardThe starship Enterprise has its tractor beam locked onto some valuable debris and is trying to pull it toward the ship. A Klingon battle cruiser and a Romulan warbird are also trying to recover the item by pulling the debris with their tractor beams as shown in Figure P5.25. a. Given the following magnitudes of the tractor beam forces, find the net force experienced by the debris: FEnt = 7.59 106 N, FRom = 2.53 106 N, and FKling = 8.97 105 N. b. If the debris has a mass of 2549 kg, what is the net acceleration of the debris? FIGURE P5.25arrow_forwardWhy is the following situation impossible? Your 3.80-kg physics book is placed next to you on the horizontal seat of your car. The coefficient of static friction between the book and the seat is 0.650, and the coefficient of kinetic friction is 0.550. You are traveling forward at 72.0 km/h and brake to a stop with constant acceleration over a distance of 30.0 m. Your physics book remains on the seat rather than sliding forward onto the floor.arrow_forward
- A ball is falling toward the ground. Which of the following statements are false? (a) The force that the ball exerts on Earth is equal in magnitude to the force that Earth exerts on the ball, (b) The ball undergoes the same acceleration as Earth. (c) The magnitude of the force the Earth exerts on the ball is greater than the magnitude of the force the ball exerts on the Earth.arrow_forwardGive reasons for the answers to each of the following questions: (a) Clan a normal force be horizontal? (b) Can a normal force be directed vertically downward? (c) Consider a tennis ball in contact with a stationary floor and with nothing else. Can the normal force be different in magnitude from the gravitational force exerted on the ball? (d) Can the force exerted by the floor on the hall be different in magnitude from the force the ball exerts on the floor?arrow_forwardA ball is falling toward the ground. Which of the following statements are false? (a) The force that the ball exerts on Earth is equal in magnitude to the force that Earth exerts on the ball, (b) The ball undergoes the same acceleration as Earth. (c) The magnitude of the force the Earth exerts on the ball is greater than the magnitude of the force the ball exerts on the Earth.arrow_forward
- Calculate the normal force on a 15.0 kg block in the following circumstances: (a) The block is resting on a level surface. (b) The block is resting on a surface tilted up at a 30.0 angle with respect to the horizontal. (c) The block is resting on the floor of an elevator that is accelerating upwards at 3.00 m./s2. (d) The block is on a level surface and a force of 125 N is exerted on it at an angle of 30.0 above the horizontal. (Sec Section 1.5.)arrow_forwardA crate remains stationary after it has been placed on a ramp inclined at an angle with the horizontal. Which of the following statements must be true about the magnitude of the frictional force that acts on the crate? (a) It is larger than the weight of the crate. (b) It is at least equal to the weight of the crate. (c) It is equal to sn. (d) It is greater than the component of the gravitational force acting down the ramp. (e) It is equal to the component of the gravitational force acting down the ramp.arrow_forwardA student takes the elevator up to the fourth floor to see her favorite physics instructor. She stands on the floor of the elevator, which is horizontal. Both the student and the elevator are solid objects, and they both accelerate upward at 5.19 m/s2. This acceleration only occurs briefly at the beginning of the ride up. Her mass is 80.0 kg. What is the normal force exerted by the floor of the elevator on the student during her brief acceleration?arrow_forward
- Consider the Washington Monument in Washington, D.C. in the United States. What forces act between it and the Earth and how do they compare? a) The monument is attracted to the Earth with a force equal to its weight, and the Earth is attracted to the monument with a force equal to the Earth’s weight acting in the same direction. b) The monument is attracted to the Earth with a force equal to its weight, and the Earth is attracted to the monument with a force equal to the Earth’s weight in the opposite direction. c) The monument is attracted to the Earth with a force equal to its weight, and the Earth is attracted to the monument with an equal force in the same direction. d) The monument is attracted to the Earth with a force equal to its weight, and the Earth is attracted to the monument with an equal force in the opposition direction.arrow_forwardDuring a solar eclipse, the Moon, Earth, and Sun all lie on the same line, with the Moon between the Earth and the Sun. (a) What force is exerted by the Sun on the Moon? N (b) What force is exerted by the Earth on the Moon? N (c) What force is exerted by the Sun on the Earth? Narrow_forwardCalculate the magnitude of the normal force on a 25.2 kg block resting on a surface that is tilted up at a 40.8° angle with respect to the horizontal.arrow_forward
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