Show:
Momentum
impulse
Impulse Momentum Theorem
Conservation of Momentum
Collisions
100
The units of momentum are this
What is kg*m/s
100
The impulse an object undergoes is equivalent to its?
What is change in momentum
100
Where did derive our impulse momentum theorem from?
What is Newtons Second Law!
100
Define Conservation of momentum in words, not an equation.
What is the total momentum of all objects interacting with one another remains constant regardless of the nature of teh forces between the objects.
100
Define and Elastic collision
What is an event when two objects completely rebound off one another. Both Momentum and Energy are conserved.
200
Momentum is defined as this.
What is the product of mass and velocity, or in other words, inertia in motion.
200
The units for Impulse are these.
What is N*s
200
What two ways can an impulse change an objects momentum?
What is magnitude or direction.
200
A loaded railway car of mass 5000kg is rolling to the right at 2m/s when it collides and sticks to an empty railway car of mass 2000 kg rolling to the left on the same track at 3 m/s. What is their speed and direction of the pair after the collision?
What is .57m/s right.
200
This is the main difference between elastic and inelastic collisions.
What is The conservation of both momentum and Kinetic energy.
300
A deer with mass of 146 kg is running head-on toward you with a speed of 17m/s. You are going north. Find the momentum of the deer.
What is 2.5x10^3 kg*m/s south.
300
What impulse is exherted if a force of 25N acts on a car for 3.2s.
What is 80 N*s
300
A 2kg skateboard is rolling across a smooth, flat floor when a girl kicks it, causing it to speed up to 4.5m/s in 0.5s without changing direction. If the average force exerted by the girl on the skateboard in its direction of motion was 6N, with what initial velocity was it moving?
What is 3 m/s
300
A boy on a 2.0kg skateboard initially at rest tosses an 8.0kg jug of water in the forward direction. If the jug has a speed of 3.0m/s relative to the ground, and the boy and skateboard move in the opposite direction at .60m/s, find the boy's mass.
What is 38kg.
300
Give me an Example of a Recoil Situation.
What is A bullet leaving a gun, a cannon and cannonball. etc.
400
A bullet traveling at 900m/s has a momentum of 4.5kg*m/s. The mass of this object is this.
What is .005kg
400
Which object has more impulse a bullet hitting a block with a force of 70N over .3s, or a hockey stick exerting 120N of force on a puck for .05s.
What is the bullet with a impulse of 21N*s
400
A 4.0 kg soccer ball approaches a player horizontally with a velocity of 18m/s to the north. The players strikes the ball and causes it to move in the opposite direction with a velocity of 22m/s. What impulse was delivered to the ball by the player?
What is 16 kg*m/s tot he south.
400
High speed stroboscopic photographs show the head of a 215g golf club traveling at 55.0m/s just before it strikes a 46g golf ball at rest on a tee. After the collision, the club travels (in the same direction) at 42m/s. Use the law of conservation of momentum to find the speed of the golf ball just after the impact.
What is 61m/s.
400
Sometimes the curiosity factor at the scene of a car accident is so great it actually produces secondary accidents as a result, while people watch to see what is going on. If an 800 kg Sports car slows down to 13m/s to check out an accident scene and is rear ended by a 1200 kg pickup truck traveling at 25m/s. The bumpers of the vehicles lock and the two vehicles move off together as one unit. What is the post collision velocity.
What is 20.2m/s
500
Which object has more momentum? A 50 kg object moving at 10m/s or a 2.5 kg object moving at 200m/s
What is there momentum is equal.
500
All cars have air bags in the steering wheel and on the sides. What is the purpose of these air bags related to impulse.
What is to increase the time the person undergoes the impact.
500
When a force exerted on an object, does a large force always produce a large change in the objects momentum than a small force does? Explain.
What is no, because the change in momentum = F*t, it is possible for a lage force applied over a very short time interval to change the momentum less than a smaller force applied over a longer time period.
500
A spacecraft undergoes a change of velocity when its rockets are fired. How does the spacecraft change velocity in empty space where there is nothing for the gases emitted by the rockets to push against?
What is The principle of conservation of momentum tells us that the momentum of the space craft and its fuel before the rockets are fired must equal the momentum of the two after the rockets are fired. Both begin at rest so our total initial momentum is zero. When the rocket is fired, the combustion of the fuel gives the exhaust gases momentum. The spacecraft will gain a momentum equal in magnitude but opposite in direction of the exhaust gases. Thus the total momentum will be kept zero.
500
If two cars collide, they usually do not stick together. Does this mean the collision is elastic.
What is no, some KE is converted to sound energy and some is converted to internal elastic potential energy as the cars deform, so the collision can not be elastic.