Transcript Unit 3.2 Force & Motion

Warm-Up Thurs 4/12/12
1. On a graph, the steeper the slope, the
_______ the speed.
2. What does a flat, horizontal line mean on a
distance vs. time graph?
Force & Motion
Review
Question 1
Which one of Newton’s Laws would best fit this situation?
Alec pushes a 50 kg box across the floor with a force of 20 N.
Later that day he pushes a 30 kg box with the same force.
Because the second box is less massive, it will have a
greater acceleration.
A.
B.
C.
Law 1
Law 2
Law 3
Question 2
Which of the following is true about
acceleration?
A.
B.
C.
D.
Acceleration is speed in a given direction.
Acceleration is a change in either speed or direction.
Acceleration is distance travelled in a given amount of time.
all of the above
Question 3
A book sitting still on a table is exerting 10 N of force onto the
table. According to Newton’s 3rd Law, how much force will
be exerted back onto the book?
A.
B.
C.
D.
20 N
0N
5N
10 N
Question 4
Which of Newton’s Laws would best explain this scenario?
Dude and Guy are dressed as giant sumo wrestlers and are running
towards each other. Once they hit, they immediately bounce off
each other. Dude falls down, but Guy does not.
A.
B.
C.
First Law
Second Law
Third Law
Question 5
What is happening in this distance vs time graph?
A. Hesoo moves at a constant speed
B. Hesoo moves one direction and
then speeds up in the opposite direction.
C. Hesoo moves in one direction, remains
at rest, and then moves in the opposite direction
D. Hesoo has no acceleration
Question 6
Which statement best summarizes the scientific concept shown in the cartoon?
A. A falling body accelerates at a constant speed.
B. The motion of an object is constantly changing due to magnetic forces.
C. The force of friction causes an object in motion to move faster.
D. A body in motion will remain in motion unless influenced by an outside force.
Question 7
With what force does a 7 kg bowling ball with an
acceleration of 4.0 m/s2 strike the pins?
A.
B.
C.
D.
28 N
3N
1.75 N
32 N
Question 8
Andrew traveling south at 80 miles per hour is
an example of:
A.
B.
C.
D.
Speed
Velocity
Acceleration
Friction
Question 9
If all the forces acting on a moving object are
balanced, then the object will:
A. slow down and stop
B. change the direction of its motion
C. accelerate
D. continue moving at a constant velocity
Question 10
The tendency of a moving object to continue in
a straight line or of a stationary object to
remain in place is called:
A.
B.
C.
D.
Gravity
Friction
Inertia
Force
Question 11
A car traveling at 90 mph hits a brick wall. The person inside the
car was not wearing a seat belt. The person will continue to
move even though the car has stopped. This is best
explained by:
A.
B.
C.
D.
Newton’s First Law
Newton’s Second Law
Newton’s Third Law
Gravity
Question 12
Which of Newton’s Laws would best fit this situation?
Max drops a ping pong ball on the table. The ping pong
ball hits the table and then bounces back up.
A. Law 1 - Inertia
B. Law 2 – F=MA
C. Law 3 – Action/Reaction
Question 13
On what section of the racetrack will the forces
on the cars be balanced?
A. the starting block
B. the ramp only
C. the level section after the ramp
D. the entire track
Question 14
What is the correct statement about
the object represented by the
graph?
a.The object is speeding up.
b.The object is slowing down.
c.The object is moving at a constant
speed.
d.The object is changing direction.
Question 15
Brian flicks a penny across the floor of his classroom.
Newton’s law of Inertia says the penny will
continue to move until acted on by an unbalanced
force. What force is slowing the penny down?
A.
B.
C.
D.
Friction
Stretching Forces
Gravity
None. The forces are balanced
Question 16
A bird is flying through the air. The wings of a bird push
air downward. Because of Newton’s 3rd Law, the air
must also be:
A. Pushing his wings downward
B. Pushing the bird forward
C. Pushing his wings at a constant speed
D. Pushing his wings upward
Question 17
A toy car travels 4 meters across the floor in 3.2
seconds. What is the speed of the car?
Speed = Distance/Time
A.
B.
C.
D.
12. 5 m/s
1.25 m/s
12.8 m/s
0.3 m/s
Question 18
If a force of 5 N is placed on an object with a
mass of 2 kg, what would the object’s
acceleration be?
A.
B.
C.
D.
10 m/s2
2.5 m/s2
25 m/s2
0.4 m/s2
Question 20
Clark rode his bicycle 24 meters to his friend’s house
down the block. It took him 2 minutes to arrive at
his friend’s house. What was Clark’s average
speed?
A. 24 meters/minute
B. 12 meters/minute
C. 48 meters/minute
D. 2 meters/minute
Question 21
Lunchbox rode his jet ski 50 meters south in 10 seconds, and
then went east another 100 meters in the same amount
of time. Which of the terms below can best be used to
describe these changes? (You may use more than one)
I. Speed
II. Velocity
III. Acceleration
Question 22
A.
B.
C.
D.
Marissa’s family traveled 480 kilometers in six hours.
At what point in the trip were they traveling the slowest?
Between hour 0 and 1
Between hour 1 and 2
Between hour 3 and 4
Between hour 5 and 6
Write a short paragraph (2-5 sentences)
answering the following:
How do speed, velocity, and
acceleration differ? How are they
calculated?