Force And Momentum Question Preview (ID: 43763)


Review On Forces And Newton's Laws Of Motion And Linear Momentum.[print questions]

Why do modern vehicles have crumple zones and airbags as safety features?
a) They increase the time a collision takes, reducing the force each moment of time
b) They decrease the time a collision takes, reducing the force each moment of time
c) They increase the time a collision takes, increasing the force each moment of time
d) They decrease the time a collision takes, decreasing the force each moment of time

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) 0 m/s
c) +20 m/s
d) -10 m/s

Impulse is equal to...
a) change in momentum
b) force divided by time
c) force x acceleration
d) momentum x time

How can you decrease the force happening during a collision?
a) Increase the time the collision happens
b) Decrease the time the collision happens
c) Increase the initial velocity
d) Balance the net forces

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) +10 m/s
c) -20 m/s
d) +20 m/s

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) 0 m/s
b) -10 m/s
c) +10 m/s
d) +20 m/s

Which type of collision has the greatest change in momentum?
a) elastic
b) inelastic
c) elastic and inelastic have the same momentum change
d) impossible to tell without more information

Total momentum ____ will ____ total momentum after.
a) before, equal
b) before, not equal
c) of one object, equal
d) of one object, not equal

On a free-body diagram, the normal force always points...
a) perpendicular to the surface of contact
b) opposite motion
c) up
d) down

Any contact pulling force is called...
a) tension
b) gravity
c) normal
d) friction

Type of collision where the objects stick together after.
a) inelastic
b) elastic
c) explosion
d) glue

Type of collision where the objects are separate after.
a) elastic
b) inelastic
c) explosion
d) glue

On a free-body diagram, the force of friction always points...
a) left
b) right
c) opposite motion
d) perpendicular to the surface of contact

On a free-body diagram, the force of gravity always points...
a) down
b) up
c) opposite motion
d) perpendicular to the surface of contact

Which of the following would generally be considered a positive direction?
a) Up
b) -
c) West
d) Left

Which of the following would generally be considered a negative direction?
a) South
b) +
c) Up
d) Right

A free-body diagram is used to...
a) see the forces acting on an object
b) see the forces the object is applying on other objects
c) calculate the action-reaction forces
d) measure the inertia of an object

Newton's Third Law of Motion is...
a) Objects in motion stay in motion, objects at rest stay at rest, unless acted on by an unbalanced force.
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) The normal force on an object is always perpendicular to the contact surface.

Newton's Second Law of Motion is...
a) Objects in motion stay in motion, objects at rest stay at rest, unless acted on by an unbalanced force.
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) The normal force on an object is always perpendicular to the contact surface.

Newton's First Law of Motion is...
a) Objects in motion stay in motion, objects at rest stay at rest, unless acted on by an unbalanced force.
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) The normal force on an object is always perpendicular to the contact surface.

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