Basic Momentum
An object needs ___ and ___ to have momentum
What is mass and velocity?
A change in momentum or force applied to an object for a period of time.
What is impulse?
In an elastic collision, both momentum and this form of energy are conserved.
What is kinetic energy?
In an inelastic collision, the objects...
What is stick together?
The total momentum of an explosive collision
What is zero?
The equation for momentum
What is p=mv?
The equation for impulse.
What is Fnet*T?
The equation for elastic collisions.
What is m1v1 + m2v2=m1v1+m2v2
The equation for inelastic collisions
What is m1v1+m2v2=(m1+m2)V?
The equation for explosion problems
What is m1v1=m2v2
If two objects collide and no external forces act, ___ applies.
What is conservation of momentum?
A force of 10 N applied for 2 seconds gives this impulse.
What is 20 N*s?
In a 1D elastic collision between two objects of equal mass, the objects do this with their velocities.
What is exchange velocities?
In an inelastic collision, some kinetic energy is transformed into these other forms of energy.
What are heat, sound, or internal energy?
A firecracker explodes into two pieces of equal mass. If one piece flies off at 10 m/s, the other must move at this speed in the opposite direction.
What is 10 m/s?
A 2 kg object moving at 3 m/s has this much momentum.
What is 6 kg·m/s?
When two objects moving at the same speed colide the object with a larger ___ creates a larger impulse
What is more mass?
These two mathematical quantities must both remain constant to qualify a collision as perfectly elastic.
What are total momentum and total kinetic energy?
A 3 kg cart moving at 2 m/s sticks to a 1 kg cart at rest. Their combined final velocity is this.
What is 1.5 m/s?
A 4 kg object at rest explodes into a 1 kg piece moving at 12 m/s and a 3 kg piece. This is the velocity of the 3 kg piece needed to conserve momentum.
What is –4 m/s?
Two ice skaters push apart. A 60 kg skater moves at 1.5 m/s, so the 40 kg skater must move at this speed in the opposite direction to conserve momentum.
What is 2.25 m/s?
The principle that extending collision time reduces force explains why these devices protect passengers.
What are airbags?
A 2 kg cart moving at 6 m/s collides elastically with a 4 kg cart at rest. After the collision, the lighter cart rebounds at –2 m/s. This is the final speed of the 4 kg cart.
What is 4 m/s?
A 5 kg cart moving at 4 m/s collides with a 3 kg cart moving at –2 m/s, and they stick together. This is their final velocity.
What is 1.75 m/s?
A 10 kg object is initially at rest. It explodes into three fragments along a straight line: a 3 kg fragment shoots to the right at 12 m/s, a 4 kg fragment shoots to the left at 8 m/s, the remaining fragment moves so that total momentum is conserved. This is the velocity of the third fragment.
What is 4 m/s to the right?