1. An object’s distance from another object is changing. acceleration force inertia motion

2. A place or object used for comparison to determine if something is in motion Center of gravity Reference point Mass Inertia

3. Speed in a given direction acceleration velocity speed momentum

4. A push or a pull on an object Mass Friction Force Momentum

5. When the overall force changes an object’s motion it is a(n)____ Balanced force Unbalanced force

6. Equal forces acting on one object in opposite directions (the object won’t move) Balanced force Unbalanced force

7. Force that one substance exerts on another when the two rub against each other Mass Friction Air resistance Force

8. Rate at which velocity changes Acceleration Speed Velocity Momentum

9. Force that pulls objects toward each other Friction Gravity Free fall Momentum

10. A type of friction that occurs between objects and air Mass Friction Air resistance Force

11. The tendency of an object to resist changes in its motion Unbalanced force Inertia Friction Motion

12. What is the formula for calculating speed? S = D x T S = D  T S = T  D

13. What is the formula for calculating acceleration? A = I – F T b. A = F – I c. A = T – I F

14. Force = Mass x Acceleration This formula shows that both the size of the force and the mass of the object itself affect the object’s acceleration, or change in velocity (speed or direction). Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

15. For every action there is an equal and opposite reaction. Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

16. An object at rest will stay at rest & an object in motion will stay in motion until acted upon by a force. Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

17. If you set a book on the desk, the book will stay there. Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

18. You lift a heavy box of books with more force than a box of sweaters. Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

19. A rocket takes off Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

20. You push on a ball harder than your little brother does and your ball goes farther. Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

21. If you are riding in a car that suddenly stops, you surge forward until the seatbelt you are wearing stops you. Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

22. When you paddle a canoe, you push back in the water with the paddle and move forward in the canoe. Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

Solve the following word problems. Don’t forget your units!!

23. A cheetah is running after its prey 23. A cheetah is running after its prey. It dashes for a meekrat that is 7 meters away. It reaches the meekrat in just 2 seconds. What is the cheetah’s average speed?

24. You are at one end of a solid metal pipe, and your friend is at the other end. Your friend hits the pipe. You hear the sound 1.5 seconds later. You both measure the pipe, and it is 7,500 meters. At what average speed did the sound your friend made travel through the pipe?

25. You are traveling with your family to Disney World from Atlanta, Georgia. Your father tells you that Disney World is 412 kilometers away. It will take you 5 hours to reach Disney World? What is your velocity?

26. During PE, you are racing against your classmates 26. During PE, you are racing against your classmates. Your beginning speed is 8 meters/second. The longer you run, the more tired you get and you slow down to 5 meters/second. Your teacher times your deceleration at 3 seconds. What is your acceleration?

Check your answers

1. An object’s distance from another object is changing. acceleration force inertia motion

2. A place or object used for comparison to determine if something is in motion Center of gravity Reference point Mass Inertia

3. Speed in a given direction A. Acceleration B. Velocity C. speed D. Momentum

4. A push or a pull on an object Mass Friction Force Momentum

5. When the overall force changes an object’s motion it is a(n) ____ Balanced force Unbalanced force

6. Equal forces acting on one object in opposite directions (the object won’t move) Balanced force Unbalanced force

7. Force that one substance exerts on another when the two rub against each other Mass Friction Air resistance Force

8. Rate at which velocity changes Acceleration Speed Velocity Momentum

9. Force that pulls objects toward each other Friction Gravity Free fall Momentum

10. A type of friction that occurs between objects and air Mass Friction Air resistance Force

11. The tendency of an object to resist changes in its motion Unbalanced force Inertia Friction Motion

12. What is the formula for calculating speed? S = D x T S = D  T S = T  D

13. What is the formula for calculating acceleration? A = I – F T b. A = F – I c. A = T – I F

14. Force = Mass x Acceleration This formula shows that both the size of the force and the mass of the object itself affect the object’s acceleration, or change in velocity (speed or direction). Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

15. For every action there is an equal and opposite reaction. Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

16. An object at rest will stay at rest & an object in motion will stay in motion until acted upon by a force. Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

17. If you set a book on the desk, the book will stay there. Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

18. You lift a heavy box of books with more force than a box of sweaters. Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

19. A rocket takes off Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

20. You push on a ball harder than your little brother does and your ball goes farther. Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

21. If you are riding in a car that suddenly stops, you surge forward until the seatbelt you are wearing stops you. Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

22. When you paddle a canoe, you push back in the water with the paddle and move forward in the canoe. Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitational Pull

23. A cheetah is running after its prey 23. A cheetah is running after its prey. It dashes for a meerkat that is 7 meters away. It reaches the meerkat in just 2 seconds. What is the cheetah’s average speed? S = D  T S = 7  2 = S = 3.5 meters/second

24. You are at one end of a solid metal pipe, and your friend is at the other end. Your friend hits the pipe. You hear the sound 1.5 seconds later. You both measure the pipe, and it is 7,500 meters. At what average speed did the sound your friend made travel through the pipe? S = D  T S = 7,500  1.5 = S = 5000 meters/second

25. You are traveling with your family to Disney World from Atlanta, Georgia. Your father tells you that Disney World is 412 kilometers away. It will take you 5 hours to reach Disney World? What is your velocity? S = D  T S = 412  5 S = 82.4 kilometers/hour V= 82.4 km/hour South

26. During PE, you are racing against your classmates 26. During PE, you are racing against your classmates. Your beginning speed is 8 meters/second. The longer you run, the more tired you get and you slow down to 5 meters/second. Your teacher times your deceleration at at 3 seconds. What is your acceleration? A = F – I T = 5 – 8 3 A = -1 m/s/s = -3