1. 3 rd quarter study guide

2. Acceleration.  a.The rate at which velocity changes is called  b.Distance traveled in a unit of time  c.Traveling from point A to point B

3. To determine the acceleration rate of an object, you must calculate the change in ________ during each unit of time  a.speed.  b.velocity.  c.motion.  d.deceleration.

4. Law of Interia  a.Newton’s third law  b.Newton’s first Law  c.Newton’s second law

5. The amount of matter in an object is called its  a.inertia.  b.mass.  c.force.  d.balance.

6. Air resistance is a type of  a.motion.  b.acceleration.  c.velocity.  d.friction.

7. Which of the following is an example of decreasing friction intentionally?  a.waxing skis  b.throwing salt on an icy driveway

8. Acceleration is  a. Changing direction only  b.Changing direction or speed  c.Changing time

9. A bus that travels 250 kilometers in 5 hours is traveling at what average speed?  a.50 km/h  b.100 km/h  c.2 km/h  d.25 km/h

10. Write next to each if rolling, fluid, or sliding friction  a.your sneakers on a basketball court  b.tires to a skate board  c.a grease on a door hinge  d.two hands rubbing together

11. Write next to each if rolling, fluid, or sliding friction  a.your sneakers on a basketball court Sliding  b.tires to a skate board Rolling  c.a grease on a door hinge Fluid  d.two hands rubbing together Sliding

12. ______ equals mass times acceleration  a.speed.  b.motion.  c.force.  d.inertia.

13. The balloon rocket lab we preformed in class can be explained by  a.Newton’s first law.  b.Newton’s second law.  c.Newton’s third law.  d.the law of conservation of momentum.

14. Force is a.  a.inertia.  b.acceleration.  c.Push or pull

15. The force of gravity on a person or object at the surface of a planet is known as  a.mass.  b.inertia.  c.air resistance.  d.weight.

16. When a person jumps off the diving board the only force acting on them is:  a.stationary.  b.decelerating.  c.in free fall.  d.a projectile.

17. The law of universal gravitation states  a.all objects attract each other.  b. all objects repel each other.  c. all objects combine to provide a balanced force.  d. all objects create friction.

18. The greater the mass of an object,  a.the easier the object starts moving.  b.the greater its inertia.  c.the more balanced it is.  d.the more space it takes up.

19. Velocity   a.You know acceleration of the object.  b.You know distance the object has traveled.  c. You know both the speed and direction of an object’s motion.

20. According to Newton’s third law of motion, when a ball bounces and exerts force on a floor, the floor  a.creates a friction with the ball.  b.bounces higher.  c.exerts an equal force back on the ball.  d.moves at a constant speed.

21. What happens when two forces act in the opposite direction?  a.They work against each other.  b.The stronger one prevails.  c.They add together.  d.Their sum divided by two is the total force.

22. Friction  a.The force that one surface exerts on another when the two rub against each other b.Change in velocity over time  d.Amount of force put on an area

23. An example of deceleration?  a.a bird taking off for flight  b.a baseball released by a pitcher  c.a bike approaching a stop sign  d.an airplane following a straight flight path

24. When an object’s distance from another object is changing  a.it is in motion.  b.it is speeding.  c.it has a high velocity.  d.it is accelerating.

25. Momentum  a. Distance÷Time  b. Mass X velocity  c. Mass X acceleration

26. Speed equals  a. Distance÷Time  b. Mass X velocity  c. Mass X acceleration

27. According to the law of conservation of momentum  a.velocity increase.  b.velocity decreases.  c.momentum is not lost.

28. A place or object used for comparison to determine if something is in motion is called  a.a constant.  b.a reference point.  c.a position.  d.velocity.

29. The momentum of an object is in the same direction as its  a.force.  b.acceleration.  c.velocity.  d.inertia.

30. The force that pulls falling objects toward Earth is called  a.freefall.  b.gravity.  c.acceleration.  d.air resistance.