CONCEPTUAL PHYSICS-W/PRACTICING PHYSICS
9th Edition
ISBN: 9780321052025
Author: Hewitt
Publisher: PEARSON
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Textbook Question
Chapter 7, Problem 15A
Referring to Figure 7.14, how many horizontal forces are exerted on the cart? What is the horizontal net force on the cart?
Expert Solution & Answer
To determine
Number of horizontal forces are exerted on the cart and the net force on the cart.
Explanation of Solution
Introduction:
Force appears in pair. According to Newton's third law of motion, for every action force there is equal and opposite reaction force.
Horse pulls the cart in forward direction let it is denoted by P. Horse applies the force on the cart in forward horizontal direction that is F. Due to friction between the ground and the wheel of the cart, the force of friction is in opposite direction that is f. This force pulls the horse that is p. So there are two horizontal forces acting on the cart (F and f), which are in opposite direction to each other.
As the cart moves in the forward direction, so the force exerted by the horse on the cart overcomes the frictional force.
Conclusion:
Two forces acting on the cart, horse pulls the cart in forward direction and frictional forces opposes the motion of a cart. Net force acting on the cart is not zero since horse pulls the cart forward. The net force on the cart is F-f.
Chapter 7 Solutions
CONCEPTUAL PHYSICS-W/PRACTICING PHYSICS
Ch. 7 - Can an action force exist without a reaction...Ch. 7 - When a hammer exerts a force on a nail, how does...Ch. 7 - When you walk on a floor, what pushes you along?Ch. 7 - State Newtons third law of motion.Ch. 7 - Consider hitting a baseball with a bat. If we call...Ch. 7 - If a bat hits a ball with 1000 N of force, can the...Ch. 7 - If the world pulls you downward against your...Ch. 7 - When a cannon is fired, are the forces on the...Ch. 7 - When a cannon is fired, why do the cannon-ball and...Ch. 7 - Identify the force that propels a rocket.
Ch. 7 - How does a helicopter get its lifting force?Ch. 7 - True or false: When a net force is exerted on a...Ch. 7 - When can two kicks on a soccer ball produce a net...Ch. 7 - Prob. 14ACh. 7 - Referring to Figure 7.14, how many horizontal...Ch. 7 - How many horizontal forces are exerted on the...Ch. 7 - How many horizontal forces are exerted on the...Ch. 7 - If you hit a wall with a force of 200 N, how much...Ch. 7 - Can you physically touch another person without...Ch. 7 - Fill in the blanks: Newtons first law is often...Ch. 7 - Three sets of double boxes rest on a table. Rank...Ch. 7 - A van exerts a force on trailers of different...Ch. 7 - Each of these boxes is pulled by the same force F...Ch. 7 - Prob. 24ACh. 7 - Your weight is the result of the gravitational...Ch. 7 - Why can you exert greater force on the pedals of a...Ch. 7 - Consider the two forces acting on a person who...Ch. 7 - If you walk on a log that is floating in the...Ch. 7 - Why is it easier to walk on a carpeted floor than...Ch. 7 - If you step off a ledge, you accelerate noticeably...Ch. 7 - When a racquet hits a tennis ball, action and...Ch. 7 - Suppose you're weighing yourself while standing...Ch. 7 - When a high jumper leaves the ground, what is the...Ch. 7 - What is the reaction force to an action force of...Ch. 7 - If action equals reaction, why isnt Earth pulled...Ch. 7 - A small car bumps into a van at rest in a parking...Ch. 7 - Does your answer to question 36 depend on the...Ch. 7 - A speeding bus makes contact with a bug that...Ch. 7 - Consider two carts, one twice as massive as the...Ch. 7 - Some people used to think that a rocket could not...Ch. 7 - Since the force that acts on a cannonball when a...Ch. 7 - Suppose you exert 200 N on your refrigerator and...Ch. 7 - The photo shows Steve Hewitt and his daughter...Ch. 7 - Hold your hand like a flat wing outside the window...Ch. 7 - Your teacher challenges you and your best friend...Ch. 7 - A pair of 50-N weights are attached to a spring...Ch. 7 - The strong man can withstand the tension force...Ch. 7 - A balloon floats motionless in the air. A...Ch. 7 - When you get up from a sitting position, do your...Ch. 7 - When a weightlifter jerks a barbell over his head,...Ch. 7 - Identify two pairs of action-reaction forces that...Ch. 7 - A car of mass m cruises along the highway at a...Ch. 7 - What will be the acceleration of recoil when a...Ch. 7 - Two people attempt a tug-of-war on low-friction...Ch. 7 - Two blocks, one three times as massive as the...Ch. 7 - What is the net force on a falling 100-N barrel...Ch. 7 - Amanda looks at a 1.0-kg bag of jellybeans resting...Ch. 7 - When 56-kg Diane on rollerskates pushes against a...Ch. 7 - A 7.00-kg bowling ball moving at 8.0 m/s strikes a...Ch. 7 - A 70-kg skydiver is falling at her terminal speed....Ch. 7 - Gymnast Gracie of weight mg is suspended by a pair...
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