Transcript Law of Acceleration

8th Science
Force, Motion, and
Energy
#1
What is speed plus
direction?
Example: Geese fly about
64 km/hr
when they migrate south.
A: Force
B:
Weight
C: Acceleration
D:
Velocity
D. Velocity
#2
A push or
pull.
A: Force
B:
Weight
C: Acceleration
D:
Air resistance
A. Force
#3
What is a change in motion?
(Speeding up, slowing
down, changing direction).
Example: An airplane slows
2
down at a rate of 3 m/s
A: Acceleration
B:
Air resistance
C: Friction
D:
Inertia
A. Acceleration
#4
What is the relationship between
force, motion, and energy?
A: It takes energy to
B:
Force causes motion
D:
Both
make force
C: Neither
D. Both A and B
#5
A force that resists motion.
A: Air resistance
B:
Friction
C: Inertia
D:
Force
B. Friction
#6
A measure of an
object’s tendency to
remain
at rest or to keep
moving with a
constant velocity.
A: Air resistance
B:
Inertia
C: Force
D:
Newton
B. Inertia
#7
Forces occur in pairs and
each pair of forces can be
either balanced or
unbalanced.
How can an unbalanced force change the
speed or direction of an object in motion?
A: One of the forces is
B:
Both forces are equal
Unbalanced forces
C: cancel each other out,
so there is no change
D:
Force
stronger than the other
A. One of the
forces is stronger
than the other
#8
Which unit measures the Unit of Force?
A: Newtons
B:
Meters
C: Seconds
D:
m/s
2
A. Newtons
#9
An object a rest remains at
rest and an object in
motion remains in motion at
a constant speed
unless acted upon by a
unbalanced force.
Ex: Seat belt
Ex: pulling the table cloth out from under dishes
A: Law 1 – Law of Inertia
B:
Law 2 – Law of
Acceleration
C: Law 3 – Law of Action
D:
Law 4 – Law of
Conservation
and Reaction
A.Law 1 –
Law of Inertia
#10
An object acted on by an
unbalanced force
will accelerate in the
direction of the force.
Ex: It takes more force to
move a car than a bicycle
*(More force is required to
move more mass.)
A: Law 1 – Law of Inertia
B:
Law 2 – Law of
Acceleration
C: Law 3 – Law of Action
D:
Law 4 – Law of
Conservation
and Reaction
B. Law 2 –
Law of
Acceleration
#11
Every action
has an equal
and opposite
reaction.
Ex: Rocket launching.
A: Law 1 – Law of Inertia
B:
Law 2 – Law of
Acceleration
C: Law 3 – Law of Action
D:
Law 4 – Law of
Conservation
and Reaction
C. Law 3 – Law
of Action and
Reaction
#12
Measure Speed
What is your speed if you travel 114 km in 3 hours?
Speed = Distance
Time
A: S = 38 km/hr
B:
S = 38 hrs
C: S = 38 km
D:
S = 3 km/hr
A. S = 38 km/hr
#13
Measure Force
What force is needed
2
to make a 36 kg object accelerate to 5 m/s ?
Force = mass x acceleration
A: F = 180 kg
B:
F = 180 N
C: F = 108 N
D:
F = 180 m/s
2
B. F = 180 N
#14
How does force effect work?
Work = Force x Distance
(if no distance, no work)
How much work would it take
to move a 50 N box over 6 meters?
A: W = 300 N
B:
W = 300 M
C: W = 300 j
D:
W = 300 km
C. 300 j
#15
Why can a
spacecraft travel
in space at a
constant speed
and in a straight
path?
A: There is no force or
B: There is no friction or
gravity
C: There is no friction or
newton
gravity
D:
There is no weight or
mass
B. There is no
friction or gravity
#16
Calculating
net force.
What would be the net
force in this diagram?
16N – 10N = 6N
A:
Box will move to the
left 6N
C: The force is balanced
B:
Box will move to the
right 6 N
D:
None of these
A. Box will move to
the left 6N
#17
This graph relates distance to
time for a jogger.
Distance vs. Time
At what rate of speed is Juan
running between
4 min and 6 min?
S= 500m/2min
A: 150m/s
B:
C: 1400m/s
D: None of these
250m/s
B. 250m/s
#18
This graph relates distance to
time for a jogger.
Distance vs. Time
What can you tell about Juan’s
motion between 7 and 11 min?
A: Stopped
B:
C: Jogging slower
D: None of these
Ran faster
A. Stopped
#19
What is potential energy?
A: Motion energy
B:
Stored energy
C: Electrical energy
D:
None of these
B. Stored energy
#20
What is kinetic energy?
A: Motion energy
B:
Stored energy
C: Electrical energy
D:
None of these
A. Motion energy
#21
How are
potential energy and
kinetic energy
related?
Energy can convert
A: from kinetic to
potential and back
again
C: Both are energy in
motion
B:
They are not related
D:
None of these
A. Energy can
convert from kinetic
to potential and back
again
#22
Which of these
graphs shows a
speed that is not
changing
(constant speed)
A: Graph A
B:
Graph B
C: Graph C
D:
None of these
C. Graph C
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