# Review of Linear Momentum

### Test

The center of mass is defined as

The equation for the center of mass of two particles is

A particle of mass 1 kg is located at (0,0) and a particle of mass 2 kg is located at (3,0). What is the location of the center of mass of this system?

The net external force on a system of particles is zero. What is the velocity of the center of mass of the system?

The net external force on a system of particles is zero. What is the velocity of each particle in the system?

Four particles of equal mass are at points (0,0), (2,0), (2,2) and (0,2). Where is the center of mass of the system?

Where is the center of mass of a single particle?

A net force of 8 N is applied to a system containing four masses, each of 1kg. What is the resultant acceleration of the center of mass of the system?

What is the definition of impulse?

What is the equation for impulse?

A bat exerts a force on a ball of 100 N for a period of .1 seconds. What is the impulse provided by the bat?

What is the definition of momentum?

A net impulse on an object causes

What is the relation between force and momentum?

A ball of mass 2 kg bounces against a wall with a velocity of 6 m/s and rebounds with the same velocity. What is the impulse provided by the wall?

What are the units of momentum, in terms of fundamental units?

What are the units of impulse, in terms of fundamental units?

Both momentum and kinetic energy are dependent on what variable?

A 4 kg mass has a momentum of 2 N-s. What is the kinetic energy of the mass?

What is the mass of an object that moves 10 meters in 2 seconds, and has a momentum of 10 N-s?

What is the definition of the momentum of a system of particles?

The total momentum of a system of particles is conserved only if

What is the linear momentum of a system of two particles with equal mass m travelling in opposite directions with speed v?

A cannon of mass 100 kg fires a shell of mass 10 kg at a speed of 100 m/s. With what speed does the cannon recoil?

A missile explodes in midair. What statement can be made about the motion of the system after the explosion?

A mass of 2 kg moves in the positive x direction with a speed of 2 m/s. A mass of 1 kg moves in the negative x direction with a speed of 3 m/s. What is the total momentum of this system?

A mass of 2 kg moves in the positive x direction with a speed of 2 m/s. A mass of 1 kg moves in the negative x direction with a speed of 3 m/s. What is the velocity of the center of mass of this system?

If the total linear momentum of a system is zero, it can be deduced that

In which of the following situations is momentum NOT conserved?

Two cars of equal mass collide head on and both come to a stop. What can be said about the cars before the crash?

A baseball of mass 1 kg is hit by a bat, changing its velocity from 50 m/s in one direction to 50 m/s in the opposite direction. What is the impulse provided by the bat?

A baseball of mass 1 kg is hit by a bat, changing its velocity from 50 m/s in one direction to 50 m/s in the opposite direction. The bat is in contact with the ball for .1 seconds. What is the average force provided by the bat over this time?

A net force of 50 N acts on a particle for 1 second. What is the impulse provided by the force?

A net force of 50 N acts on a particle of mass 5 kg for 1 second. What is the change in the velocity of the particle?

Are impulse and momentum vector or scalar quantities?

What is the definition of an elastic collision?

What is the definition of a completely inelastic collision?

Two particles of the same mass and speed collide head on in an elastic collision. What can be said about the final velocity of each particle?

Which of the following problems, given initial conditions of mass and velocity of each particle, is NOT solvable?

A particle of mass 1 kg moving at a velocity of 50 m/s hits a particle of mass 1 kg, at rest in an elastic collision. What is the final velocity of the second particle?

A particle of mass 1 kg moving at a velocity of 50 m/s hits a particle of mass 1 kg, at rest in a completely inelastic collision. What is the final velocity of the second particle?

A particle of mass 1 kg moving along the x axis collides with a particle of mass 1 kg moving along the y axis with the same speed in a completely inelastic collision. What is the angle each particle makes with the x axis?

How many equations can we use to solve a one dimensional elastic collision problem?

How many equations can we use to solve a one dimensional completely inelastic collision problem?

How many equations can we use to solve a two dimensional elastic collision problem?

How many equations can we use to solve a two dimensional completely inelastic collision problem?

In EVERY collision problem, what is conserved?

A particle at rest explodes into two pieces. What can be said about the motion of each piece?

The collision of two pool balls is approximately what kind of collision?

In any isolated system (with no external forces acting) which of the following is NOT conserved?

## Take a Study Break

### What's your Pretty Little Liars name?

Take this quiz to find out!

### Which young actress just got married?

Click to find out!

### Cat bearding WINS THE INTERNET

Have you seen this yet?

### Scary movies with funny posters

These. Are. Hilarious.

### Geeky Actors: Then and Now

Travel back in time!

### Villains We Want These Actresses to Play

From super cute to super bad!

### 10 Movies Better Than Their Books

What do you think?