physics test
Two identical gliders slide toward each other on an air track. One moves at 1 ml s and the other at 2 m/s. They collide and stick. The combined mass moves at
1/2 m/s
Consider massive gliders that slide friction-free along a horizontal air track. Glider a. has a mass of 1 kg, a speed of 1 m/s, and collides with glider B, which has a mass of 5 kg and is at rest. If they stick upon collision, their speed after collision will be
1/6 m/s
A 5000-kg freight car moving at 2 m/s runs into a 10,000-kg freight car at rest. They couple upon collision and move away as one body at
2m/s
The speed of a 4kg ball with momentum of 12 kg m/s is
3 m/s
If you can't avoid being hit by a fast-moving object, you'll suffer a smaller contact force if you can extend that force over a
Longer time
The conservation of momentum is most closely related to
Newton's 3rd law
The impulse-momentum relationship is a direct result of
Newton's second law
A sandbag is motionless in outer space. a. second sandbag with 3 times the mass moving at 12 m/s collides with it and they both stick together, and move at a speed of
None of the above
is it correct to say that impulse is equal too
a corresponding change in momentum
If several balls are thrown straight up with varying initial velocities, the quantity that will have the same value for each trial is the ball's
acceleration
As Bronco Brown steps off a hovering high-flying helicopter and falls through the air, he experiences
all of the above
a force dropped on an apple hitting the ground depends on
all of the above
Two vehicles with equal magnitudes of momentum traveling at right angles to each other undergo an inelastic collision. The combined wreck moves in a direction
at 45 degrees to the direction of either car before collision.
You're driving down the highway and a bug spatters into your windshield. Which undergoes the greater change in momentum during the time of contact?
both the same
A karate chop is more effective if one's hand
bounces on impact
A cannon recoils from firing a cannonball. The speed of the cannon's recoil is small because the
cannon has more mass than the ball
When bullets are fired from an airplane in a foward direction, the momentum of an airplane
decreased
When Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard, the speed of the skateboard
decreases
which has greater momentum when moving
either of these depending on speed
Two vehicles with equal magnitudes of momentum traveling at right angles to each other undergo an inelastic collision. The magnitude of momentum for the combined wreck is
greater than the magnitude of momentum of either car before collision.
A softer landing occurs when an falling object bounces from a surface
in an extended time
A golf ball moving forward with 1 unit of momentum strikes and bounces backward off a heavy bowling ball that is initially at rest and free to move. The bowling ball is set in motion with a momentum of
more than one unit
A karate expert executes a swift blow and breaks a cement block with her bare hand. The magnitude of the force experienced by her hand is
the same as the force applied to the block
To catch a fast-moving ball, you extend your hand forward before contact with the ball and let it ride backward in the direction of the ball's motion. Doing this reduces the force of contact on your hand principally because the
time of contact is increased
A 1-kg chunk of putty moving at 1 m/ s collides and sticks to a 5-kg bowling ball initially at rest. The bowling ball and putty then move with a momentum of
1 kg m/s
A rifle of mass 2 kg is suspended by strings. The rifle fires a bullet of mass 1/100 kg at a speed of 200 m/s. The recoil velocity of the rifle is about
1 m/s
