# What do you know about linear momentum?

1. If no forces are acting on a moving mass, it will keep moving along the same path with the same velocity forever.
True False

2. Every mass has a linear momentum associated with it.
True False

3. If there are outside forces acting on an object, then it's linear momentum is conserved.
True False

4. How is linear momentum calculated?
(A)the product of an object's mass and velocity
(B)with a speedometer
(C)the sum of an object's energy and its speed
(D)by the quantity of force exerted on an object
(E)a special device made to measure linear momentum

5. What is the linear momentum of a bullet moving at 250 m/sec with a mass of .1 kg?
(A)250 kg m/sec
(B)25 kg m/sec
(C)2.5 kg m/sec
(D).25 kg m/sec
(E)the object has no linear momentum

6. Which of the following objects has the most linear momentum?
(A)a 1 kg ball thrown at 20 m/sec
(B)a 6 kg bowling ball moving at 5 m/sec
(C)a 50 kg woman walking at .5 m/sec
(D)a parked 1300 kg truck
(E)a .000001 kg molecule traveling at 1000 m/sec

7. Challenge Question: A 450 kg rhinocerous charges a 1050 kg elephant at 10 m/sec while the elephant is sleeping. Assuming the rhinocerous and elephant stick together upon impact, how fast are they moving after the rhinocerous' charge?
(A)15 m/sec
(B)10 m/sec
(C)6 m/sec
(D)3 m/sec
(E)cannot be determined from this information

8. Finished? Sneak a peak at the answers and see how you did!

Bang! Boing! Pop! Interactive Physics on the World Wide Web
Created for Thinkquest 96 by Josh Levine, Paulina Kuo, and Doug Brown