Momentum and Collisions
A helium atom collides with another helium atom in an elastic collision. Which of the following is true? A) Both momentum and kinetic energy is conserved B) Momentum is conserved but kinetic energy is not conserved C) Kinetic energy is conserved but momentum is not conserved D) Neither momentum nor kinetic energy is conserved
A
How does the momentum of an object change if the object's velocity doubles? A) The momentum doubles B) The momentum increases by a factor of four C) The momentum decreases by a factor of 1/2 D) The momentum decreases by a factor of 1/4
A
In what kind of collision is kinetic energy always conserved? A) Elastic collision B) Inelastic collision C) Perfectly elastic collision D) Perfectly inelastic collision
A
A tennis ball is dropped from 1.0 m, bounces off the ground, and rises to 0.85 m. What kind of collision ocurred between the ball and the ground? A) Elastic collision B) Inelastic collision C) Perfectly elastic collision D) perfectly inelastic collision
B
Most collisions in the everyday world are A) Elastic collisions B) Inelastic collisions C) Perfectly elastic collisions D) Perfectly inelastic collisions
B
Two playground balls collide in an inelastic collision. Which of the following is true? A) Both momentum and kinetic energy conserved B) Momentum is conserved, but kinetic energy is not conserved C) Kinetic energy is conserved, but momentum is not conserved D) Neither momentum nor kinetic energy is conserved
B
What is the product of an object's mass and its velocity? A) Kinetic energy B) Momentum C) Impulse D) Inertia
B
When two ice skaters initially at rest push off one another, their final momenta are A) equal in magnitude and direction B) equal in magnitude and opposite in direction C) In the same direction but of different magnitudes D) In opposite directions and possibly of different magnitudes
B
Which of the following can determine the magnitude of the change in an object's momentum? A) Mass and acceleration B) Force and time interval C) Force and distance D) Acceleration and time interval
B
A croquet ball moving at 2.0 m/s strikes another ball of equal mass. The first ball stops moving after the collision. What is the velocity of the second ball after the collision? A) -2.0 m/s B) 0 m/s C) 2..0 m/s D) 4.0 m/s
C
A small marble collides with a billiard ball that is initially at rest. Which of the following is true? A) The momentum of each object increases B) The momentum of each object decreases C) The momentum of the billiard ball increases, and the momentum of the marble decreases D) The total momentum before and after the collision is zero
C
Conservation of momentum follows from A) Newton's first law B) Newton's second law C) Newton's third law D) The law of conservation of energy
C
If a net force acts on an object, then the object's momentum A) will increase B) will decrease C) Will either increase or decrease D) May or may not change
C
What are the units of momentum? A) N B) J C) kg x m/s D) kg x m/s²
C
Which of the following has the greatest momentum? A) A 4,0 kg bowling ball moving at 2.0 m/s B) A 0.15 kg baseball moving at 10.0 m/s C) A 1.6 x 10³ kg car moving at 0.5 m/s D) A 0.02 kg bullet moving at 950 m/s
C
Which of the following is true of changes in momentum? A) A small force may produce a large change in momentum by acting over a short time interval B) A small force may produce a large change in momentum by acting over a long distance C) A large force may produce a small change in momentum by acting over a short time interval D) A small force may produce a large change in momentum by actin on a very massive object
C
A batter hits a baseball back to the pitcher at the same speed as the pitch. Which of the following is true? A) The momentum of the ball is the same before and after the batter hits the ball B) The magnitude of the ball's momentum is greater after the batter hits the ball C) The magnitude of the ball's momentum is less after the batter hits the ball D) The magnitude of the ball's momentum is the same before and after the batter hits the ball
D
A billiard ball hits the edge of another billiard ball that is initially at rest. The second ball moves off at an angle. Which of the following is true? A) The momentum of the first ball doesn't change B) The momentum of the second ball doesn't change C) The total momentum of the system increases D) The momentum lost by the first ball is gained by the second ball
D
Two cars collide, lock bumpers, and move together after the collision. What kind of collision is this? A) Elastic collision B) Inelastic collision C) Perfectly elastic collision D) perfectly inelastic collision
D
When an inelastic material is in a collision? A) The work done to deform the material is equal to the work done to return the material to its original shape B) The work done to deform the material is equal to the work the material does to other objects in the collision C) The work done to deform the material is equal to the increase in the system's total kinetic energy D) Some of the work done to deform the material is converted to other forms of energy
D
When two objects interact in an isolated system A) The momentum of each object is conserved B) The total momentum of the system is zero C) The total momentum is conserves only if the objects move in opposite directions D) The total movement is always conserved
D
Which of the following expresses the law of conservation of momentum? A) The total momentum of an isolated system is zero B) The total momentum of any system always remains constant C) Every object in an isolated maintains a constant momentum D) The total momentum of an isolated system remains constant regardless of the forces between the objects in the system
D
Which of the following involves a change in momentum? A) A bowling ball rolls down the lane at constant speed B) A car coasts down a hill at constant speed C) A sky diver descends with terminal velocity D) A spacecraft travels at constant speed while slowly losing mass
D
Which of the following is not evidence that kinetic energy has been so lost in a collision? A) The collision produces a sound B) At least one of the objects is deformed after the collision C) AT east one of the objects increases in temperature as a result of the collision D) One of the objects is at rest after the collision
D
