Lesson 17 to 18: Momentum Flashcards
What is momentum?
A) A scalar quantity of mass
B) A vector quantity resulting from mass and velocity
C) The force acting on an object
D) The speed of an object
B) A vector quantity resulting from mass and velocity
What is the formula for momentum?
A) p = mv
B) p = m/v
C) p = m + v
D) p = mv²
A) p = mv
What unit is momentum measured in?
A) kg
B) m/s
C) kg·m/s
D) J
C) kg·m/s
If two identical cars are traveling at the same speed, but in opposite directions, what can be said about their momentum?
A) They have the same momentum
B) They have different momenta due to direction
C) Their momentum is zero
D) They have different kinetic energies
B) They have different momenta due to direction
How is Newton’s 2nd Law of Motion related to momentum?
A) A net force acting on an object causes its velocity to increase
B) A net force acting on an object causes its momentum to change
C) Momentum is always conserved in motion
D) A net force does not affect momentum
B) A net force acting on an object causes its momentum to change
What is a free-body diagram?
A) A diagram showing only forces
B) A diagram representing an object as a point with forces drawn from its center
C) A diagram of energy transfer
D) A diagram illustrating motion
B) A diagram representing an object as a point with forces drawn from its center
What is the center of mass?
A) The heaviest part of an object
B) The average position of all the mass in an object
C) The center point of a moving object
D) The point where momentum is conserved
B) The average position of all the mass in an object
What is a crumple zone?
A) A part of a vehicle designed to be rigid
B) A part of a vehicle designed to absorb impact forces
C) The engine compartment of a vehicle
D) A safety device for passengers
B) A part of a vehicle designed to absorb impact forces
Why are crumple zones important?
A) They increase the speed of the vehicle
B) They reduce the impact force reaching the occupants
C) They improve fuel efficiency
D) They make the vehicle heavier
B) They reduce the impact force reaching the occupants
What does impulse refer to in physics?
A) The change in kinetic energy
B) The product of mass and velocity
C) A net force acting on an object for a certain amount of time
D) The total energy of an object
C) A net force acting on an object for a certain amount of time
What is the relationship between impulse and impact force?
A) Increasing impulse time decreases impact force
B) Decreasing impulse time increases impact force
C) Impulse and impact force are unrelated
D) Impact force is always constant
A) Increasing impulse time decreases impact force
Which equation represents impulse?
A) J = mv
B) J = F_net * t
C) J = m + v
D) J = p/
B) J = F_net * t
What does it mean when two objects have the same momentum but different directions?
A) They have the same speed
B) Their kinetic energy is equal
C) They have equal magnitudes of momentum
D) They are moving at different velocities
C) They have equal magnitudes of momentum
How does a net force influence an object’s momentum?
A) It has no effect on momentum
B) It can only decrease momentum
C) It can change momentum over time
D) It can only increase momentum
C) It can change momentum over time
What is the effect of increasing impulse time on the impact force experienced by an object?
A) It increases the impact force
B) It decreases the impact force
C) It has no effect on the impact force
D) It changes the direction of the impact force
B) It decreases the impact force
