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(II) A baseball $( m = 145 \mathrm { g } )$ traveling 32$\mathrm { m } / \mathrm { s }$ moves a fielder's glove backward 25$\mathrm { cm }$ when the ball is caught. What was the average force exerted by the ball on the glove?

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$$3.0 \times 10^{2} \mathrm{N}$$

Physics 101 Mechanics

Chapter 7

Work and Energy

Work

Kinetic Energy

Potential Energy

Energy Conservation

Cornell University

University of Michigan - Ann Arbor

Simon Fraser University

University of Sheffield

Lectures

04:05

In physics, a conservative force is a force that is path-independent, meaning that the total work done along any path in the field is the same. In other words, the work is independent of the path taken. The only force considered in classical physics to be conservative is gravitation.

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In physics, the kinetic energy of an object is the energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body in decelerating from its current speed to a state of rest. The kinetic energy of a rotating object is the sum of the kinetic energies of the object's parts.

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7.55. So we will baseball that's traveling at some initial speed here, uh, and it gets caught and moves the, uh, the fielder's glove 25 7 meters. Uh, you know, before it stops. So we want to find what the average forests the ball exerts on the globe. So the work that's done on the ball is going to be. It's change in kinetic energy, So it's final kinetic energy zero. Its initial kinetic energy is 1/2 and the initial square, and this is going to be the negative of the work done on the glove. Since we're looking for the force on the glove, this is what we want. So the work on the glove is going to be the the average force times displacement, and then our angle is going to be zero degrees because the force that the ball is exerting on the glove is in the same direction as the displacement of the glove. So the forest is going to be the kinetic energy, the initial kinetic energy of of the ball divided by the distance that they both move after the ball is caught and this is 3.0 times hadn't squared Newtons

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