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Q. 2

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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 weightlifter stands up at constant speed from a squatting position while holding a heavy barbell across his shoulders.

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 weight lifter and barbell.

c. The free body diagram is :

See the step by step solution

Step by Step Solution

Part (a) Step 1 : Given information

A weightlifter stands up at constant speed from a squatting position with a heavy barbell across his shoulders.

Part (a) Step 2 : Calculation

There are four interactions in below diagram can be seen.

There is the interaction between the weightlifter and a barbell, interaction between the weightlifter and the surface, the interaction between the earth and a barbell, interaction between the earth and the weightlifter.

Part (a) Step 3 : Final answer

The interaction diagram is :

Part (b) Step 4 : Given information

A weightlifter stands up at constant speed from a squatting position with a heavy barbell across his shoulders.

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 weight lifter and barbell.

Part (b) Step 6 : Final answer

The system consists of the weight lifter and barbell.

Part (c) Step 7 : Given information

A weightlifter stands up at constant speed from a squatting position with a heavy barbell across his shoulders.

Part (c) Step 8 : Calculation

Free body diagram for weight lifter stands up at constant speed from squatting position while holding a heavy ball across his shoulders is shown below.

Normal force 'n' is acting on upward on weight lifter (WL) and there will be forced due to gravity, which is is acting opposite to the normal force and the force due to barbells (BB) on WL which is F_wl on BB in the above diagram.

Similarly there is the force acting on barbells due to the weight lifter which is F_bb on wool.

The free body diagram is :

Part (c) Step 9 : Final answer

The free body diagram is :

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