Robotics Unit 5 Review

Which of the following is NOT a property of equilibrium?

• Sum of the forces = 0.

• Sum of the displacements = 0.

• The object is at rest.

• Sum of the torques = 0.

In a mechanical system comprised of a motor, a gear train, a lifting arm, and a specified load force on the arm, what is the first step in calculating the required gear ratio to lift the load?

• Sum the torques of the drive motors.

• Sum the forces at the free end of the arm.

• Sum the torques about the free end of the arm.

• Sum the torques about the arm pivot.

What is the worst-case scenario used to calculate maximum lifting capacity of an arm?

• Arm lowered at a 15-degree angle below horizontal.

• Arm raised at a 45-degree angle above horizontal.

• Arm extended vertically.

• Arm extended horizontally.

Which of the following is a method for finding the center of gravity of an object?

• Float the object in water.

• Find the balance point of the object.

• Hang the object in two orientations.

• Spin the object and find its axis of rotation.

What is NOT a typical use for a limit switch?

• To determine the location of a mechanism.

• To protect people from harm.

• To protect mechanisms from damage.

• To allow human control of a mechanism.

When we are considering three-dimensional motion (motion in the real world), how many degrees of freedom do we consider?

• Six translational and three rotational.

• Three translational and three rotational.

• Six translational and six rotational.

• Three translational and six rotational.

In a mechanical system comprised of a motor, a gear train, a moment arm, and a load, which of the following is NOT required to calculate the lifting capacity?

• Arm length.

• Arm width.

• Gear ratio.

• Motor torque.

When we are considering two-dimensional motion (motion in a flat plane), how many degrees of freedom do we consider?

• One translational and two rotational.

• Two translational and one rotational.

• One translational and one rotational.

• Two translational and two rotational.

What is the equation for calculating torque?

• T = force−distance

• T = force+distance

• T = force/distance

• T = force*distance

Which of the following is NOT a way to increase the weight-carrying capacity of a gripper?

• Increase the friction coefficient.

• Decrease the friction coefficient.

• Increase the force.

• Change the angle that the force is applied.