Chapter 2: Problem 21
State Newton's third law.
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Chapter 2: Problem 21
State Newton's third law.
These are the key concepts you need to understand to accurately answer the question.
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A Honda Civic hybrid weighs about 2900 pounds. Calculate the weight of the car in newtons and its mass in kilograms. (FYI, \(0.22 \mathrm{lb}=1 \mathrm{~N} ; 1 \mathrm{~kg}\) on Earth's surface has a weight of \(10 \mathrm{~N}\).)
For each of the following interactions, identify the action and reaction forces. (a) A hammer strikes a nail. (b) Earth gravity pulls down on a book. (c) A helicopter blade pushes air downward.
A farmer urges his horse to pull a wagon. The horse refuses, saying that to try would be futile, for it would flout Newton's third law. The horse concludes that it can't exert a greater force on the wagon than the wagon exerts on itself, so it wouldr't be able to accelerate the wagon. What explanation can you offer to convince the horse to pull?
The heavyweight boxing champion of the world punches a sheet of paper in midair, bringing it from rest up to a speed of \(25.0 \mathrm{~m} / \mathrm{s}\) in \(0.050 \mathrm{~s}\). The mass of the paper is \(0.003 \mathrm{~kg}\). Show that the force of the punch on the paper is only \(1.5 \mathrm{~N}\).
Why can you exert greater force on the pedals of a bicycle if you pull up on the handlebars?
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