physics practice problems chapter 7
a ball with a momentum of 4 kg m/s hits a wall and bounces straight back without losing any kinetic energy. What is the change in the ball's momentum?
-8 kg m/s
a .2 kg baseball is pitched with a velocity of 40 m/s and is then battled to the pitcher with a velocity of 60 m/s. What is the magnitude of change in the ball's momentum?
4 kg m/s
which of the following situations is an example of a visible change in momentum?
a baseball is hit by a bat
which of the following statements properly relates the variables in the equation F delta t= delta p?
a large constant force acting over a long time interval causes a large change in momentum.
which of the following situations is an example of a significant change in momentum?
a tennis ball is hit into a net
which of the following has the greatest momentum?
a tortoise with a mass of 275 kg moving at a velocity of .55 m/s
an object that is speeding up would have
an increasing momentum
a 75 kg person walking around a corner bumped into an 80 kg person who was running around the same corner. The momentum of the 80 kg person
decreased
a 20 kg shopping cart moving at a velocity of .5 m/s collides with a store wall and stops. The momentum of the shopping cart
decreases
which of the following equations can be used to directly calculate the change in an object's momentum?
delta p= F delta t
two objects move separately after colliding, and both the total momentum and total kinetic energy remain constant. Identify the type of collision.
elastic
after colliding, objects are deformed and lose some kinetic energy. Identify the type of collision
inelastic
a roller coaster climbs up a hill at 4 m/s and then zips down the hill at 30 m/s. The momentum of the roller coaster
is greater down the hill than up the hill
which of the following units represent the standard metric units of momentum?
kilogram- meter/second
in a two-body collision,
momentum is always conserved
which of the following statements about the conservation of momentum is not correct?
momentum is not conserved for a system of objects in a head-on collision
which of the following best describes the momentum of two bodies after a two-body collision if the kinetic energy of the system is conserved?
must also be conserved
which of the following equations can be used to directly calculate an object's momentum,p?
p=mv
two balls of dough collide and stick together. Identify the type of collision.
perfectly inelastic
two objects stick together and move with a common velocity after colliding. Identify the type of collision.
perfectly inelastic
a rubber ball moving at a speed of 5 m/s hit a flat wall and returned to the thrower at 5 m/s. The magnitude of the momentum of the rubber ball
remained the same
two objects with different masses collide and bounce back after an elastic collision. Before the collision, the two objects were moving at velocities equal in magnitude but opposite in direction. After the collision,
the less massive object had gained momentum
when comparing the momentum of two moving objects, which of the following is correct?
the less massive object will have less momentum if the velocities are the same.
in an inelastic collision between two objects with unequal masses,
the momentum of one object will increase by the amount that the momentum of the other object decreases.
the change in an object's momentum is equal to
the product of the force applied to the object and the time interval
two swimmers relax close together on air mattresses in a pool. One swimmer's mass is 48 kg, and the other's mass is 55 kg. If the swimmers push away from each other,
their momenta are equal but opposite
true or false--> momentum is a vector quality; it has a direction associated with it.
true
a billiard ball collides with a second identical ball in an elastic head-on collision. What is the kinetic energy of the system after the collision compared with the kinetic energy before the collision?
unchanged