Transcript hw 1246914222829 - Fort Thomas Independent Schools

ITP HOMEWORK
Ch. 2
Mechanical Equilibrium
Pg. 24-25 (1,2,4,6,
9,14,22, 28,29)
1.
What is the difference between force
and net force on an object.

Force is a push or a pull; net force is the
combination of all forces acting on an object.
2.
What is the net force on a box that is being
pulled to the right w/ 40 N and to the left with 30 N?

10 N to the right
30 N
40 N
4.
What two quantities are necessary to
determine a vector quantity?

Magnitude and direction
6.
Give an example of a vector and a
scalar quantity.


Vector: 45 N horizontal (force), 35 m/s east
(velocity)
Scalar: 5 m (distance), 10 s (time), 45 m/s
(speed)
9.
What is the net force on an object at
rest?

Zero. All forces are balanced.
14. Can an object be moving and still be in
(mechanical) equilibrium?


Yes. If the object moves at a constant speed
in a straight line, then the net force on the
object is equal to zero.
This is referred to in the book as dynamic
equilibrium.
22.

22. B is the same as D, then C and then A.
Ch. 2 Mechanical Equilibrium
Agree. If a single nonzero force
acts on an object, then the object
will not be in mechanical
equilibrium. There must be at
least one more force acting on
the object to cause mechanical
equilibrium.
29. Scale reads half her weight.
28.