Exam 2 Review Questions Flashcards
A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is
0, no force is needed
The amount of force needed to sustain motion of a rock in outer space is
nothing is needed
A constant net force on a railroad car produces
acceleration, F=ma
if an objects mass is decreasing while a constant force is applied to the object, the acceleration
increases
when you walk, you push on the floor to the left and the floor
pushes on you to the right
the force of friction on a sliding object is 10 N. The applied force needed to maintian a constant velocity is
10
A 10-N falling object encounters 4 N of air resistance. The net force on the object is
6
when a falling object has reached its terminal velocity, its acceleration is
0
a ball thrown vertically into the air. Because of air resistance on the way up and on the wway down, its speed when it returns to its starting level is
the same
issac newton discovered
that gravity is universal
according to issac newton, the greater the masses of interacting objects,
the greater the gravitational force between them
the difference between newtons law of universal gravitation as a proportion as an equation invovles
constant G
the gravitational constatn G was first measured
after newtons time
your weight is the force
equal to your normal force on any surface
when you weigh yourself on a bathroom scale on a slight incline instead of a level surface, your weight reading on the scale will be
less
the concept of force is fundamental to
newtons theory of gravitation
