Torque - Mass on Plank with String

The video tutorial explains a physics problem involving a mass resting on a wooden plank supported by a string. It covers the setup, free body diagram, forces, torque, and static friction. The tutorial demonstrates solving for the tension in the string and the normal force from the wall, concluding with a practical demonstration and discussion of results.

What is the mass of the wooden plank used in the problem setup?

• 0.300 kilograms

• 0.395 kilograms

• 1.000 kilograms

• 0.764 kilograms

In static equilibrium, what is the net force acting on the plank?

• Equal to the normal force

• Zero

• Equal to the tension in the string

• Equal to the weight of the plank

Which force was initially missing from the free body diagram?

• Gravitational force

• Static friction force

• Normal force

• Tension force

What is the role of static friction in the system?

• To increase the mass of the plank

• To reduce the normal force

• To balance the torques caused by gravity

• To increase the tension in the string

How is the force of tension in the string calculated?

• By dividing the mass of the plank by the length of the plank

• By summing the torques and dividing by the sine of the angle

• By multiplying the normal force by the cosine of the angle

• By adding the forces of gravity on the mass and plank

What was the measured tension force during the demonstration?

• 9.2 Newtons

• 10.9 Newtons

• 11 Newtons

• 8.6 Newtons

What is the normal force from the wall on the plank?

• 10.9 Newtons

• 8.6 Newtons

• 9.23 Newtons

• 11 Newtons