Transcript Force and Motion Review Game File

th
8
Grade
Forces and Motion
Speed, Velocity
And
Acceleration
Newton’s
Laws
vocabulary
Mix Up
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Forces
10 points
In the picture above, a boy is trying to pull a dog on a
leash, but the dog and the boy are moving in the same
direction. Which of the following best describes the
forces in this situation?
F The forces are balanced, and the net force is zero.
G The forces are unbalanced, and the boy’s force is
greater.
H The forces are unbalanced, and the dog’s force is
greater.
J The forces are balanced, and the dog is stronger
than the boy
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10 points
A N S W E R:
H The forces are unbalanced,
and the dog’s force is
greater.
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20 points
Unbalance forces cause a change in an
objects______________.
A shape
B speed, shape, and direction
C color and direction
D velocity
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20 points
A N S W E R:
B speed, shape, and
direction
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30 points
A sailboat comes with an outboard motor which applies a force of 75 N. A
gust of wind applies a force of 25 N to the sailboat. What is the net force
and direction of the movement if the water exerts a force of 50 N?
F
G
H
J
50 N to the Right
50 N to the Left
150 N to the Right
150 N to the Left
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30 points
A N S W E R:
F 50 N to the left
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40 points
1000 N
2000 N
2000 N
1000 N
According to the diagram shown,
F the forces acting on the helicopter are unbalanced.
G the helicopter is speeding up due to unbalanced forces
H the helicopter is slowing down
J the helicopter is not changing speed or direction.
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40 points
A N S W E R:
J the helicopter is not changing speed or
direction.
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50 points
An unhappy individual is trying to slide a 100
kg desk across a wood floor. He pushes with a
force of 800 N but the desk does not move.
One can conclude that the force of friction is:
A exactly 800 N
B more than 980 N
C more than 800 N
D exactly 980 N
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50 points
A N S W E R:
A exactly 800 N
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10 points
A pitcher through a fast ball at 75
mph. This is an example of _____.
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10 points
A N S W E R:
speed
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20 points
The suspect fled from the police on foot at 2
miles per hour east on Wallisville. This is an
example of_____
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20 points
A N S W E R:
velocity
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30 points
All are examples of acceleration except----.
A) a car making circles in the parking lot is
B) A bicycle stopping and slowing down at an
intersection
C)A student typing 30 words per minute on the
computer
D) A student running north on a winding trail.
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30 points
A N S W E R:
C)A student typing 30
words per minute on the
computer
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40 points
A car that begins to move after a
stoplight turns green is an
example____.
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40 points
A N S W E R:
acceleration
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50 points
Which example differentiates between speed and velocity?
A An airplane speeds up to take off and slows down to land.
B A car driving 50 mph down the highway, as a train traveling east
moves 100 mph.
C A marathon runner jogs 30 miles in an hour, whereas a sprinter
runs 100 meters in 13 seconds.
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50 points
A N S W E R:
B A car driving 50 mph down the
highway, as a train traveling east
moves 100 mph.
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10 points
The illustrations show
soccer balls of different
masses being kicked with
equal force.
Which ball will have the
greatest acceleration?
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10 points
A N S W E R:
A
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20 points
According to Newton’s 3rd Law, when a hammer
strikes and exerts a force on a nail, the nail__.
A creates a balanced force
B disappears into the wood
C moves at a constant speed
D exerts an equal and opposite force back on the
hammer
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20 points
A N S W E R:
D exerts an equal
and opposite force
back on the
hammer
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30 points
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30 points
A N S W E R:
D
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40 points
A baseball is thrown by an astronaut standing on the surface
of the moon. It continues to move in the direction it is
thrown until it gets caught up in Earth’s gravitational pull.
What primarily allows it to travel so far?
A lack of air which is a source of gravity
B lack of air which is a source of acceleration
C lack of air which is a source of friction
D lack of air which is a source of inertia
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40 points
A N S W E R:
C lack of air which is a source of friction
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50 points
A book is sitting on a dashboard of a car that's stopped at a
traffic light. As the car starts to move forward, the book slides
off the dashboard. Which choice best explains why the book
moved?
A There was grease on the dashboard.
B The car was moving forward, therefore when it stopped the
book continued in the forward motion due to inertia.
C A supernatural force took over.
D Air resistance made the book move backward.
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50 points
A N S W E R:
B The car was moving forward,
therefore when it stopped the book
continued in the forward motion due
to inertia
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10 points
The measure of distance divided by time is
______________.
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10 points
A N S W E R:
speed
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20 points
An object’s tendency to resistance a
change in motion is________.
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20 points
A N S W E R:
inertia
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30 points
A change in velocity is_______.
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30 points
A N S W E R:
acceleration
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40 points
_________is the speed and direction
an object is moving.
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40 points
A N S W E R:
velocity
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50 points
Unit of measurement
for force
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50 points
A N S W E R:
Newton
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10 points
A force is anything that can put matter in motion. Objects exert
forces on each other. For example, when you sit on a chair, you
exert a force on the chair and the chair exerts a force back on you.
What exert mean?
A it is a synonym for inertia
B to apply a force
C cause a change
D stop
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10 points
A N S W E R:
B to apply a force
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20 points
Every force has two parts.
What are the part?
A) push or pull
B) speed and direction
C) direction and
acceleration
D) magnitude, or strength
and direction
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20 points
A N S W E R:
D) magnitude, or strength and direction
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30 points
Which of the following objects is most likely to move to the right,
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?
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30 points
A N S W E R:
B
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40 points
___________is a force that
opposes motion between two
surfaces that are in contact with
each other; they rub against each
other in opposite directions
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40 points
A N S W E R:
friction
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50 points
Whenever the surfaces of two objects rub together,
a friction force is generated that acts on both
objects and opposes their relative motion. This is
true even if one (or both) of the objects is a fluid (a
gas or liquid, such as air or water). When the fluid
in question is air, the friction force generated is
called air resistance or wind resistance. What does
the word resistance mean?
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50 points
A N S W E R:
To oppose,
opposite or
against
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