Download answers

Name: _______________________________
Period: 1 2 3 4 5 6 7
Chapter 3 Review
Choose the term from the word list that best completes each statement. Write the term in the blank at the left
of each statement.
acceleration
air resistance
sliding
terminal velocity
static
friction
acceleration
1. Newton’s Second Law shows the relationship between force,
mass, and __________________.
friction
2. _______________ is the force that opposes motion.
sliding
3. _____________ friction is experienced when a box is pushed
across a floor.
air resistance
4. _____________ is experienced by a leaf falling from a tree.
terminal velocity
5. When the force of gravity and air resistance become equal, an
object will reach it’s ________________.
Choose the answer that best completes each of the following sentences. Write the letter for that answer on
the line to the left of each question.
_______6. The upward force on an object falling through the air is ____.
a. air resistance
c. momentum
b. inertia
d. terminal velocity
_______7. The relationship among mass, force, and acceleration is explained by ____.
a. conservation of momentum
c. Newton's second law of motion
b. Newton's first law of motion
d. Newton's third law of motion
_______8. A feather will fall through the air more slowly than a brick because of ____.
a. air resistance
c. inertia
b. gravity
d. momentum
_______9. According to Newton's second law of motion, ____.
a. F = m x a
c. F = p x a
b. F = m x v
d. F = p x v
_______10. In the absence of air, a penny and a feather that are dropped from the same height at the same
time will ____.
a. fall at different rates
c. float
b. fall at the same rate
d. not have momentum
Use complete sentences to answer the following questions.
11. Explain how opening a parachute will effect a skydivers velocity and air resistance.
The parachute will create a lot of air resistance for the sky diver. It will also cause the sky diver to
achieve his terminal velocity a lot faster, which will be slower due to the air resistance created by the chute.
12. Two objects that have the same mass are dropped from a tall building. One object is larger and flatter
than the other. Explain why the larger, flatter object hits the ground last.
The larger, flatter object will create more air resistance. The flatness of the object will catch more air
than the less flat object.
Choose the term from the word list that best completes each statement. Write the term in the blank at the left
of each statement.
action
gravity
mass
momentum
reaction
velocity
weight
gravity
1. _______________ is an attractive force between any two
objects.
mass
2. The gravitational pull between objects depends on the
___________ and the distance between the objects.
weight
3. The Earth’s gravitational pull determines your _____________.
momentum
4. In the equation p = m x v, the p represents _____________.
velocity
5. Momentum has direction because _______________ has
direction.
reaction
6. That backward “kick” of a rifle that is fired is an example of
a(n) ________________ force.
Choose the answer that best completes each of the following sentences. Write the letter for that answer on
the line to the left of each question.
_______7. The size of the gravitational force between two objects depends on their ____.
a.
frictional forces
b. inertia
c.
masses and the distance between them
d. speed and direction
_______8. As you get farther from the center of Earth, your weight will ____.
a. decrease
c. remain the same
b. increase
d. can't tell from information
_______9. When a force is exerted on a box, an equal and opposite force is exerted by the
box. These forces are called ____ forces.
a. action-reaction
c. frictional
b. centripetal
d. gravitational
_______10. A real car moving at 10 km/h has more momentum than a toy car moving at the
same speed because the real car ____.
a. generates less friction
c. has less mass
b. has greater mass
d. has greater forward motion
_______11. The statement "to every action there is an equal and opposite reaction" is ____.
a. the law of conservation of momentum
b. Newton's first law of motion
c. Newton's second law of motion
d. Newton's third law of motion
_______12. The unit of momentum is ____.
a. kg x m
b. kg x m/s
c. kg x m/s2
d. m/s2
_______13. A 300-N force acts on a 25-kg object. The acceleration of the object is ____.
a. 7,500 m/s2
c. 25 m/s2
2
b. 300 m/s
d. 12 m/s2
Use complete sentences to answer the following questions.
14. Explain how mass and weight are different from each other.
Mass is the amount of atoms that make up an object, weight is the force on the object due to
gravity. If an object experiences a change in gravity, the weight will change, however the mass will remain
the same regardless of a change in gravity.
15. A bowling ball hits some pins. Explain what happens to the momentum of the ball and the
momentum of the pins.
Some of the momentum of the bowling ball is transferred to the pins so the momentum of the ball
will decrease. The pins which were standing still to begin will gain the momentum that was transferred
from the ball.
16. Sally throws a ball horizontally from the top of a tall building at the same time that Pete
drops a ball from the top of the same building. Which ball will hit the ground first? Explain
your answer.
Both of the balls will hit the ground at the same time, due to gravity.