PHYS 1401 Physics Assignment Help

PHYS 1401 Physics Assignment Help

PHYS 1401 Lab-5: Torque
Name: ________________________

Objectives:
· Describe the factors that determine whether two objects will balance each other

· Predict how changing the position of a mass on the balance will affect the motion of the balance

· Use a balance to the find the masses of unknown objects

Torque
Torque is the twisting effect caused by one or more forces. Torque is a twisting action that produces rotational motion or a change in rotational motion. To understand torque (rhymes with dork), hold the end of a meterstick horizontally with your hand. If you dangle a weight from the meterstick near your hand, you can feel the meterstick twist. Now if you slide the weight farther from your hand, the twist you feel is greater, although the weight is the same. The force acting on your hand is the same.

Lever arm is the distance between the point of application of the force and the axis of rotation. It is the shortest distance between the applied force and the rotational axis. We are intuitively familiar with torques while playing on a seesaw. Kids can balance a seesaw even when their weights are unequal. Weight alone doesn’t produce rotation. Torque does, and children soon learn that the distance they sit from the pivot point is every bit as important as weight.

Torque is calculated using the equation:

We are hanging mass on the meter stick. Force is the weight of the object. Lever arm is the distance between the fulcrum and point where mass is hanged. When the torques are equal, making the net torque zero, no rotation is produced. The meter stick will be in equilibrium. Mathematically,

Procedure
1. Open the PhET Simulation Balancing Act https://phet.colorado.edu/sims/html/balancing-act/latest/balancing-act_en.html

2. Choose “Balance lab” tab. Play around with the simulation for a few minutes to understand/ explore the functionalities of the different components.

3. Select the following options in right corner of the screen: Mass Labels, Level, Rulers

4. To check if the wooden board is balanced, remove supports under the board by toggling the switch at bottom of the screen to right.

PHYS 1401 Physics Assignment Help

Case-1:
Consider this situation without using the simulation:

80 kg man is sitting to the right of the pivot and a 20 kg boy is to the left of the pivot.

1. Predict what will happen when the supports are removed and explain your reasoning.

2. Predict what will happen if the 80 kg adult was further from the pivot (more right) and explain your reasoning.

3. Predict what will happen if the 20 kg child was closer to the pivot (more right) and explain your reasoning.

4. Test your predictions in the Balance Lab. Make notes about any ideas you have that need to be changed.

5. What are some rules you could use to make predictions for other situations where masses are on a balance?

Case-2:
Place 5 kg fire extinguisher at 2 m mark to the left of the pivot. Where should you place the 10 kg trash can to balance the board? Show your calculations.

10 kg can is to the right of the pivot and a 5 kg fire extinguisher is to the left of the pivot.

(We can cancel “g” as g is present in each term of the equation)

Masses m1 and m2 are given; r1 = 2 m; unknown r2 =?

Case-3:
Place 5 kg brick and 10 kg brick to the right of the pivot, and 15 kg to the left of the pivot. Where should you place these bricks to balance the board? Show your calculations.

Place 5 kg brick and 10 kg brick to the right of the pivot, and 15 kg to the left of the pivot.

(We can cancel “g” as g is present in each term of the equation)

Solve for r3. Given: m1 = 10 kg, m2 = 5 kg, m3 =15 kg

Finding unknown masses
Choose “Balance Lab” tab. Select the following options in right corner of the screen: Mass Labels, Level, Rulers In the “Bricks” section on the right of the screen, click on the right arrow. Keep on clicking to the right until you see “Mystery Objects”.

Find out the mass of each of the Mystery Objects “E”, “F”, and “G” by balancing each of these against the bricks of known masses. For each Mystery Object, paste a screenshot of balanced seesaw and show all calculation steps.

Mystery Object “E”
Screenshot of balanced seesaw: Calculations:

Mystery Object “F”
Screenshot of balanced seesaw: Calculations:

Mystery Object “G”
Screenshot of balanced seesaw: Calculations:

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