Q. 2 A weightlifter stands up at cons... [FREE SOLUTION]

91影视

Chapter 7: Q. 2 (page 177)

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 鈥渟ystem鈥� 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.

Short Answer

Expert verified

a. The interaction diagram is :

b. The system consists of the weight lifter and barbell.

c. The free body diagram is :

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 $W_{w l}$ 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 :