Dynamics Ch 13

2.  The positive n direction of the normal and tangential coordinates is ____________.

• normal to the tangential component

• always directed toward the center of curvature

• normal to the bi-normal component

• All of the above

The tangential acceleration of an object

• represents the rate of change of the velocity vector’s direction.

• represents the rate of change in the magnitude of the velocity.

• is a function of the radius of curvature.

• Both B and C

The normal acceleration of an object

• represents the rate of change of the velocity vector’s direction.

• represents the rate of change in the magnitude of the velocity.

• is a function of the radius of curvature.

• Both A and C

The block has a mass of 20 kg and a speed of

  v = 30 m/s at the instant it is at its lowest point.  Determine the tension in the cord at this instant.

• 1596 N

• 1796 N

• 1996 N

• 2196 N

Newton’s second law can be written in mathematical form as ΣF = ma. 

Within the summation of forces, ΣF, ________  are(is) not included

• External Forces

• Weight

• Internal Forces

• None of the above