2. 1. Momentum is often called ________ in motion Answer: inertia

3. 2. ______ is measured in kg and is a component of momentum Answer: mass

4. 3. _____________ is a vector quantity that is defined as the rate of change in position or distance. Answer: velocity

5. 4. ________ is the rate of change in velocity, and can be either positive or negative depending on the direction. Answer: acceleration

6. 5. Newton’s 1 st law refers to this term as resistance to change in motion. Answer: inertia

7. 6. _________ is measured in Newtons, this term is defined as a push or pull and will result in a change in velocity, therefore a change in an object’s momentum. Answer: force

8. 7. __________ is the result of just a force acting on an object. Think of an egg cracking when it hits the floor. Answer: impact

9. 8. _________ is the result of a force over a period of time acting on an object. Items like airbags, and padding increase this and prevent damage to objects as their momentum is changed. Answer: impulse

10. 9. This law states that for every action there is an equal and opposite reaction therefore this formula below is true, and can be used to calculate recoil of a gun when a bullet is shot. Δmv= Δmv Answer: Newton’s 3rd

11. 10. This law states that when a force is applied to an object with mass, the object will accelerate in the direction of the force. The formula looks like this F=ma, or when dealing with impulse looks like this: Ft = Δmv Answer: Newton’s 2nd

12. 11. An object can have momentum even when it is not moving because it has mass. Answer: False, no velocity = no momentum

13. 12. When you increase the amount of time a force is applied to an object when stopping it, you will decrease the amount of force needed. Answer: True

14. 13. Air bags, crumple zones, and bending your knees when you land all increase the force needed to stop. Answer: False they increase time which decreases the force needed.

15. 14. When solving for momentum, mass and momentum have a direct relationship. Answer: True, if you increase mass you will increase momentum.

16. 15. An impulse is needed to change momentum. Answer: True, you must apply a force to change velocity Ft= Δmv

17. 16. When an egg is thrown at a wall it breaks, when an egg is thrown at a sheet suspended from the ceiling it does not break, because the sheet applies a greater force over a shorter period of time. Answer: False, the sheet applies less force over a larger period of time.

18. 17. Calculate the momentum if… a bowling ball has a mass of 2 kg and is moving 2 m/s Answer: 4 kg m/s

19. 18. Calculate velocity if… An object has a momentum of 10 kg m/s and a mass of 2 kg. Answer: 5 m/s

20. 19. Which has more momentum, a missle with a mass of 500 kg moving at 20 km/hr or a bullet with a mass of.05 kg moving at 20000 km/hr? Answer: the missle has more momentum at 10,000 than the bullet at 1000 kg km/hr

21. 20. Calculate the force needed to stop a 10 kg object moving at 5 m/s in 3 seconds. Answer: 16.6 N

22. 21. A rifle shoots a 7 gram bullet out of its barrel at 190 m/s. If the gun has a mass of 3 kg what is the velocity of the recoil? Answer:.44 m/s

23. 22. If a van with a mass of 2275 kg is traveling at 28 m/s rear-ends a car with a mass of 875 and a speed of 16 m/s, what is their combined velocity after the crash if they are stuck together? Answer: 24.67 m/s

24. 23. A van with a mass of 2275 kg is traveling at 28 m/s rear-ends a car with a mass of 875 and a speed of 16 m/s, if the speed of the van is 10 m/s after the collision what is the speed of the car? Answer: 62.8 m/s

25. 24. A 0.035 kg bullet strikes a 5 kg stationary block and embeds itself in the block. The block and the bullet move together at 8.6 m/s. What is the original velocity of the bullet? Answer: 1227.17 m/s

26. 25. A 3000 kg moving truck is traveling east at 5 km/hr and hits headon a 1000 kg car traveling west at 10 km/hr. The two vehicles stick together in the collision what is the post-collision velocity of the truck and car? Answer: 1.25 m/s