Unit 8 Question Preview (ID: 13869)
Momentum.
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In mechanical systems, a large reduction in momentum is accomplished without damage to the machinery by
a) applying a large stopping force for a short time
b) reducing the momentum to zero in the shortest amount of time
c) reducing the momentum to zero in the longest possible time
d) slowing down the machinery in the shortest amount of time
The law of conservation of momentum tells us that in an isolated system:
a) the total momentum before an interaction equals the total momentum after the interaction
b) the velocity before an interaction equals the velocity after the interaction
c) the kinetic energy before an interaction equals the kinetic energy after the interaction
d) the total momentum before an interaction is greater than the total momentum after the interaction
An object's momentum tells us mostly about
a) the potential energy the object has
b) the amount of motion the object has
c) the physical size of the object
d) the specific gravity of the object
What are the metric units for momentum?
a) kgm/sec
b) slug ft/ sec
c) kg/m sec
d) kg m sec
L mom =
a) I + w
b) m times I
c) I times w
d) mr^2
The linear impulse of a 10 lb force acting on an object for 5 seconds is what
a) 2 lb sec
b) 50 lb sec
c) 0.5 lb sec
d) 0 lb sec
Which of the following will give you the full and correct information about a rotating object's angular momentum
a) mass and angular velocity
b) mass and radius
c) moment of inertia and angular velocity
d) linear momentum and specific gravity
When a golf ball is hit, the linear impulse involved is the product of the force applied by the club to the ball and
a) the distance the ball moves
b) the time the club is in contact with the ball
c) the mass of the golf ball
d) the mass of the golf club
Momentum is what kind of quantity
a) scalar
b) vector
c) both
d) neither
A linear force applied to an object for a period of time is called
a) linear momentum
b) linear impulse
c) angular momentum
d) angular impulse
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