Module 6 review questions Flashcards
What is required for an object to be in translational equilibrium?
The sum of the forces acting on it must be zero.
Distinguish between dynamic equilibrium and static equilibrium.
In dynamic equilibrium, an object is moving, but it has no acceleration.
In static equilibrium, there is also no acceleration, but the object doesn’t move.
What is tension in physics? With what unit is it measured?
Tension is the force from a tight string, rope, or chain. It is measured in Newtons.
What is the difference between torque and force?
Force causes translational acceleration and torque causes rotational acceleration.
What is required for an object to be in rotational equilibrium?
The sum of the torques acting on it must be zero.
A mechanic tries with all of his might to unscrew a nut. No matter how hard he tries, however, he cannot do it. What would you suggest the mechanic do in order to get the nut unscrewed?
The mechanic should use a longer wrench because increasing the lever arm will increase the torque.
Before cars came out with power steering, a big car required a much bigger steering wheel than a small car. Why?
If the steering wheel is large, the driver grasps the wheel far from the axis of rotation. This increases the lever arm, allowing the driver to apply more torque to the steering wheel, making it easier to turn.
When analyzing motion on an incline, why do we split the forces up into components that are parallel and perpendicular to the incline?
The motion on an incline always occurs parallel to the incline, and the normal force exerted by the incline is perpendicular to the incline. Thus, these dimensions are the best in which to work, because they contain interesting action.
