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Q. 3

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 177

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Short Answer

A steel cable with mass is lifting a girder. The girder is speeding up.

a. Draw an interaction diagram.

b. Identify the “system” on your interaction diagram.

c. Draw a free-body diagram for each object in the system. Use

dashed lines to connect members of an action/reaction pair.

a. The interaction diagram is :

b. The system consists of the steel cable and girder.

c. The free body diagram is :

See the step by step solution

Step by Step Solution

Part (a) Step 1 : Given information

A steel cable is lifting a girder and the girder is speeding up.

Part (a) Step 2 : Explanation

There are four interactions in below diagram can be seen.

There is the interaction between the steel cable and girder, interaction between girder and the surface, interaction between the earth and steel cable interaction between the earth and girder.

The interaction diagram is:

Part (a) Step 3 : Final answer

The interaction diagram is :

Part (b) Step 4 : Given information

A steel cable is lifting a girder and the girder is speeding up.

Part (b) Step 5 : Explanation

A system is defined as the space which consist all the constituent participating in the space.

Here the system consists of the steel cable and girder.

Part (b) Step 6 : Final answer

The system consists of the steel cable and girder.

Part (c) Step 7 : Given information

A steel cable is lifting a girder and the girder is speeding up.

Part (c) Step 8 : Explanation

are the tension force acting on girder and cable respectively. There will be gravity force due to its weight which is acting opposite to the tension, and they are

The free body diagram is :

Part (c) Step 9 : Final answer

The free body diagram is :

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