Rotational Motion of a Rigid Body

A body with a definite shape that doesn't change is:

• period

• angular acceleration

• rigid body

• radius of gyration

The number of complete revolutions per second is:

• frequency

• period

• torque

• rotational inertia

The product of the force times the lever arm; the movement of the force about the axis is:

• torque

• lever arm

• rotational inertia

• angular momentum

If a system is in static equilibrium, it must have the following 2 conditions:

• ∑τ=0

• Constant acceleration

• ∑F=0

• Positive forces only

The formula used to find a torque is...

• (m)(g)

• (F) cos(Ɵ)

• (m)(a)

The easiest way to open a heavy door  is by applying the force

• Near the hinges
• In the middle of the door
• At the edge of the door far from the hinges
• At the top of the door

Conditions for equilibrium are:

1st condition: net force = 0

2nd condition:net torque = 0

• True

• False

__________ (ω)– the rate at which a body rotates about an axis (radians per second)

• linear speed
• rotational speed
• angular speed
• velocity

Torque can be positive or negative.

• True
• False

The value of torque depends on the rotation axis and the _______________________

• magnitude of applied force.

• mass of object

• moment inertia of object

• shape of object