Transcript Segment During a race, runners

NEWTON’S LAWS TEST
REVIEW
1
A motorcycle traveling 35 mi/hr slows as it
approaches a stop sign. This is an example of —
a)
b)
c)
d)
acceleration
distance
speed
velocity
2
 A released balloon flies across the room. The
balloon slows down as the forces become —
a)
b)
c)
d)
balanced
frictional
restricted
unbalanced
3
A bike racer travels 17 mi/hr in a
southerly direction. This is an example of
—
a) distance
b) speed
c) velocity
d) acceleration
4
The net force of balanced force pairs is
____.
a.
b.
c.
d.
positive.
negative.
either positive or negative.
zero
Between which two locations would the
greatest change in speed most likely occur?
a)
b)
c)
d)
Between
Between
Between
Between
S and T
T and U
U and X
T and X
6
What force is necessary to accelerate a 1,250
kg car at a rate of 40 m/s 2 ?
a.
b.
c.
d.
31.25 N
40.0 N
1,250 N
50,000 N
Segment
During a race, runners . . .
A
. . . wait at the starting line for the starter’s
signal.
B
. . . speed up on the straight section of the
track.
C
. . . change direction as they round the corner
of the track.
D
. . . slow down after they cross the finish line.
Based on the observations, the runners do not
accelerate during —
a) Segment A
b) Segments A and C
c) Segments B and C
d) Segments C and D
8
30 N
left
50 N
right
 What is the net force acting on the object?
20 N right
 Are the forces balanced or unbalanced?
unbalanced
9
How does Newton’s first law of motion apply to
a ball rolling across the gym floor after an
unbalanced force is applied?
a) The ball will stop at the line halfway across the
gym.
b) The ball will continue to roll until an unbalanced
force is applied.
c) The ball will start bouncing until it hits the wall.
d) The ball will roll in a zigzag pattern to the other
end of the gym.
10
The law requires all people riding in a car to wear seat belts. If
the car suddenly stops, the seat belts hold the passengers in
place. How does Newton’s first law of motion apply when a
person is not wearing a seat belt?
a) A The passengers will continue moving forward due to
inertia.
b) B The passengers will move backward into the seat.
c) C The passengers will lean into another passenger’s seat.
d) D The passengers will not be affected by the sudden stop
of the car.
11
When the air is released from a balloon, the air moves out one
end and the balloon moves in the other direction. Which
statement does this situation best illustrate?
A
B
C
D
What goes up must come down.
For every action there is an equal and opposite reaction.
The shape and size of an object af fect air resistance.
The acceleration due to Earth’s gravity is 9.8 m/s2.
12
Which of these statements best describes the action reaction force needed to launch a space shuttle ?
a) The ground pushes up on the rocket when exhaust gases
push down on the ground.
b) Exhaust gases push down on air, while the ground pushes
up on the rocket.
c) The rocket pushes exhaust gases down, while the exhaust
gases push the rocket up.
d) Gravity pulls the rocket exhaust down, while friction pushes
up against the atmosphere.
OBJECT
MASS (g)
VOLUME (cm3)
X
38
32
Y
36
19
Z
21
35
If a force of 50 N is applied to each of the three
objects, which one will have the least acceleration?
a)
b)
c)
d)
Object
Object
Object
Object
X, because it has the greatest mass
Y, because it has the least volume
Z, because it has the least mass
Z, because it has the greatest volume
How much force is needed to accelerate
a 3 kg toy car at a rate of 1.5 m/s 2?
F=MxA
F = 3kg x 1.5m/s 2
F= 4.5 N