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Chapter 7: Q19Q (page 170)

Describe a collision in which all kinetic energy is lost.

Short Answer

Expert verified

When a piece of putty falls on a solid surface and sticks, it loses all of its kinetic energy during the collision.

Step by step solution

01

Determine the nature of the collision: elastic or inelastic

The kinetic energy is lost during an inelastic collision. All kinetic energy is lost during a perfectly inelastic collision.

Here, all the kinetic energy is lost during the collision, so it is inelastic

02

Consider an example

When a piece of putty falls on a solid surface and sticks, it loses all of its kinetic energy during the collision. Just before the collision, the putty has some kinetic energy. But after the collision, it sticks to the surface and does not move. Therefore, the kinetic energy of the putty becomes zero after the collision.

Similarly, if a heavy truck collides with a car head-on, the collision is inelastic because the bodies almost lose all their energy and stick to each other after the collision.

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Most popular questions from this chapter

A huge balloon and its gondola, of mass M, are in the air and stationary with respect to the ground. A passenger, of mass m, then climbs out and slides down a rope with speed v, measured with respect to the balloon. With what speed and direction (relative to Earth) does the balloon then move? What happens if the passenger stops?

Suppose the force acting on a tennis ball (mass 0.060 kg) points in the \({\bf{ + x}}\) direction and is given by the graph of Fig. 7鈥�33 as a function of time.

(a) Use graphical methods (count squares) to estimate the total impulse given the ball.

(b) Estimate the velocity of the ball after being struck; assuming the ball is being served so it is nearly at rest initially. [Hint: See Section 6鈥�2.]

FIGURE 7-33 Problem 23.

Two asteroids strike head-on: before the collision, asteroid A\(\left( {{m_{\rm{A}}} = 7.5 \times {{10}^{12}}\;{\rm{kg}}} \right)\)has velocity 3.3 km/s and asteroid B\(\left( {{m_{\rm{B}}} = 1.45 \times {{10}^{13}}\;{\rm{kg}}} \right)\)has velocity 1.4 km/s in the opposite direction. If the asteroids stick together, what is the velocity (magnitude and direction) of the new asteroid after the collision?

A massless spring with spring constant k is placed between a block of mass m and a block of mass 3m. Initially the blocks are at rest on a frictionless surface and they are held together so that the spring between them is compressed by an amount D from its equilibrium length. The blocks are then released and the spring pushes them off in opposite directions. Find the speeds of the two blocks when they detach from the spring.

A uniform circular plate of radius 2R has a circular hole of radius R cut out of it. The center of the smaller circle is a distance 0.80R from the center C of the larger circle, Fig. 7鈥�41. What is the position of the center of mass of the plate? [Hint: Try subtraction.]

FIGURE 7-41

Problem 55.
See all solutions

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