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Force And Momentum
Test Description: Review on forces and Newton's Laws of Motion and linear momentum.
Instructions: Answer all questions to get your test result.
1) Newton's First Law of Motion is...
A
The normal force on an object is always perpendicular to the contact surface.
B
The acceleration of an object is directly related to the force and indirectly related to the mass.
C
Every action force has an equal and opposite reaction force.
D
Objects in motion stay in motion, objects at rest stay at rest, unless acted on by an unbalanced force.
2) Newton's Second Law of Motion is...
A
Every action force has an equal and opposite reaction force.
B
The acceleration of an object is directly related to the force and indirectly related to the mass.
C
The normal force on an object is always perpendicular to the contact surface.
D
Objects in motion stay in motion, objects at rest stay at rest, unless acted on by an unbalanced force.
3) Newton's Third Law of Motion is...
A
Every action force has an equal and opposite reaction force.
B
Objects in motion stay in motion, objects at rest stay at rest, unless acted on by an unbalanced force.
C
The acceleration of an object is directly related to the force and indirectly related to the mass.
D
The normal force on an object is always perpendicular to the contact surface.
4) A free-body diagram is used to...
A
calculate the action-reaction forces
B
see the forces acting on an object
C
see the forces the object is applying on other objects
D
measure the inertia of an object
5) Which of the following would generally be considered a negative direction?
A
Right
B
+
C
South
D
Up
6) Which of the following would generally be considered a positive direction?
A
Left
B
-
C
Up
D
West
7) On a free-body diagram, the force of gravity always points...
A
perpendicular to the surface of contact
B
down
C
opposite motion
D
up
8) On a free-body diagram, the force of friction always points...
A
perpendicular to the surface of contact
B
left
C
opposite motion
D
right
9) On a free-body diagram, the normal force always points...
A
up
B
opposite motion
C
down
D
perpendicular to the surface of contact
10) Any contact pulling force is called...
A
gravity
B
tension
C
friction
D
normal
11) Type of collision where the objects stick together after.
A
explosion
B
elastic
C
glue
D
inelastic
12) Type of collision where the objects are separate after.
A
explosion
B
glue
C
elastic
D
inelastic
13) Which type of collision has the greatest change in momentum?
A
impossible to tell without more information
B
elastic and inelastic have the same momentum change
C
elastic
D
inelastic
14) Total momentum ____ will ____ total momentum after.
A
before, equal
B
of one object, not equal
C
of one object, equal
D
before, not equal
15) 10 kg at -20 m/s collides with 10 kg stationary object in an inelastic collision. What is the final velocity?
A
-10 m/s
B
+20 m/s
C
-20 m/s
D
+10 m/s
16) 10 kg at -20 m/s (object A) collides with 10 kg stationary object (B) in an elastic collision. What is the final velocity of A?
A
-10 m/s
B
+20 m/s
C
0 m/s
D
+10 m/s
17) 10 kg at -20 m/s (object A) collides with 10 kg stationary object (B) in an elastic collision. What is the final velocity of B?
A
+20 m/s
B
-10 m/s
C
-20 m/s
D
0 m/s
18) Impulse is equal to...
A
force x acceleration
B
force divided by time
C
change in momentum
D
momentum x time
19) How can you decrease the force happening during a collision?
A
Decrease the time the collision happens
B
Balance the net forces
C
Increase the time the collision happens
D
Increase the initial velocity
20) Why do modern vehicles have crumple zones and airbags as safety features?
A
They decrease the time a collision takes, decreasing the force each moment of time
B
They increase the time a collision takes, increasing the force each moment of time
C
They increase the time a collision takes, reducing the force each moment of time
D
They decrease the time a collision takes, reducing the force each moment of time
*select an answer for all questions
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