Ch 11: Impulse and Momentum

Knight Calc - Physics for Scientists and Engineers 5th Edition

Knight Calc5th EditionPhysics for Scientists and EngineersISBN: 9780137344796당신이 사용하는 게 아니라요?교과서 변경

Knight Calc 5th Edition

Ch 11: Impulse and Momentum

문제 4

11장, 문제 4

What is the impulse on a 3.0 kg particle that experiences the force shown in FIGURE EX11.4?

검증된 단계별 안내

Step 1: Recall the formula for impulse, which is the integral of force over time. Mathematically, impulse (J) is given by:

J = \int_{t}^{f} F d t

, where

F

is the force and

t

is time.

Step 2: Analyze the graph provided. The force varies with time, forming two distinct triangular regions. The first triangle spans from

t = 0

t = 6

, and the second triangle spans from

t = 6

t = 18

. The impulse can be calculated by finding the area under the force-time graph.

Step 3: Calculate the area of the first triangle. The formula for the area of a triangle is

\frac{1}{2} \times base \times height

. Here, the base is

6

seconds and the height is

5

Step 4: Calculate the area of the second triangle. Again, use the formula for the area of a triangle. The base is

12

seconds (from

6

18

) and the height is

5

Step 5: Add the areas of the two triangles to find the total impulse. The impulse is equal to the sum of these areas, which represents the total change in momentum of the particle.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Impulse

Impulse is defined as the change in momentum of an object when a force is applied over a period of time. It is mathematically expressed as the product of the average force and the time duration during which the force acts. Impulse can also be calculated as the area under the force-time graph, which represents the total effect of the force on the object.

Force-Time Graph

A force-time graph visually represents how a force varies with time. The area under the curve of this graph corresponds to the impulse experienced by the object. In the provided graph, the shape indicates that the force is applied in a pulsed manner, which can be analyzed to determine the total impulse by calculating the area of the triangular and rectangular sections.

Momentum

Momentum is the product of an object's mass and its velocity, representing the quantity of motion an object possesses. It is a vector quantity, having both magnitude and direction. The change in momentum of an object is directly related to the impulse applied to it, as described by the impulse-momentum theorem, which states that impulse equals the change in momentum.