Check Your Understanding 1. What is the magnitude of the momentum
of a 1000 kg car traveling at 5 m/s?
a. 200 kg. m/s
b.1000 kg. m/s
O c. 5000 kg. m/s
6. Which of the following is the mathematical
definition of an impulse?
O a. force times change in velocity
O b. force times change in distance
O c. force times change in time
2. What happens to an object's momentum if its
mass is reduced by half but its velocity remains
the same?
O a. The momentum doubles.
Ob. The momentum remains the same.
Oc. The momentum is reduced by one half.
7. A heavy object and a light object have the same
momentum. Which object has the greater velocity?
O a. The heavier object has the greater velocity.
Ob. The lighter object has the greater velocity.
O c. They have the same velocity.
3. Which of the following have a greater momentum
than a 10 kg ball rolling at 10 m/s? Select all correct
answers.
a. a 1 kg ball rolling at 50 m/s
b. a 5 kg ball rolling at 25 m/s
c. a 20 kg ball rolling at 10 m/s
d. a 50 kg ball rolling at 5 m/s
e. a 100 kg ball that is stationary
8. Which is true about the momentum in an isolated
system for a collision of two objects in the system?
O a. The total momentum is the same before and
after the collision.
Ob. The total momentum is less before
the collision than after the collision.
O c. The total momentum is greater before the
collision than after the collision.
4. Select all of the statements that are true
about momentum.
a. Two objects with the same mass have the
same momentum.
b. An object at rest has zero momentum.
c. Momentum is a vector quantity.
d. Two objects with different velocities but the
same mass have the same momentum.
e. An object's momentum varies with velocity.
9. Two people on roller skates are facing each other
and not moving. Select all correct statements.
a. Both have a momentum of zero while
stationary.
b. If they push on each other and
start moving, one has a positive velocity,
and the other has a negative velocity.
c. If they push on each other, the person
with the smaller mass will have the greater
momentum.
d. If they push on each other, the
person with the greater mass remains
stationary while the other person moves.
e. The momentum of each person stays
constant, whether stationary, pushing on the
other person, or after pushing.
5. Which equation is used to calculate the change
in momentum from an impulse?
Oa. p=mv
Ob. Ap=mv
Oc. p=FAT
Od. Ap=FAT