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37 Cards in this Set

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1. You are in Maypearl. You decide to head south to Austin. In 2 hours, you travel 120 km. What is your velocity?
(Hint: Velocity is just speed with a direction added. How do you calculate speed?)
1. 60 km/hr South
2. What law did we learn about in this chapter that was discovered by Sir Isaac Newton?
2. The Law of universal gravitation (Law of gravity)
3. If you are riding your bike and you come to hill and slow down, what type of acceleration are you demonstrating?
3. Negative acceleration (deceleration)
4. If acceleration changes, what could be changing? (Hint: Look at your definition.)
4. Speed, velocity, or direction
5. How does the distance between two objects affect the gravity between them? (Short Answer)
5. The closer the objects are, the greater the gravitational pull will be. The further apart the objects are, the less the gravitational pull will be.
6. Name two ways in which friction can be increased. (Short Answer)
1. Increase the mass
2. Make one of the surface more rough
7. What is the rate an object moves that does not include direction called?
7. Speed
8. If a balanced force is applied to an object, will it cause an object to move?
8. No.
9. What is the net force any time a balanced force is applied to an object?
9. Zero.
10. What is the formula to calculate speed?

Write it in a sentence.
10. Speed is the distance traveled divided by the time it takes to travel that distance.
11. Define force.
11. A push or a pull.
12. What are the 3 things that the law of universal gravitation talks about?
12. Force, mass, and distance
19. A car traveling 35 m/s South turns and enters a highway going 35m/s East. How has its motion changed?
19. It has changed its velocity.
20. What is the unit used to express force?
20. Newton
21. What is the net force when you combine a force of 15N North with 6N South?
9N North
30. When does an object's velocity remain constant (does not change)?
30. When its speed or direction do not change.
22. If the Earth's mass doubled, what would happen to your weight?
22. Increase because gravity increased.
29. For motion to occur, what must happen to the forces?

Does acceleration have to take place?
1. The net force must be greater than zero
2. Unbalanced forces must be exerted
3. Acceleration does take place
23. Venus and the Earth have about the same mass but Venus is closer to the Sun. What does this tell you about the gravitational pull between Venus and the Sun?
23. It is greater because it is closer.
28. Is the amount of gravity between 20Kg of lead and the Earth the same as the amount of gravity between 20Kg of marshmellows and the Earth?
28. Since they have the same mass, the gravitational pull on them is the same.
31. What is one way to increase friction between a car and the road on an icy day?
31. Put sand on the road
25. Draw a graph showing the deceleration of a car using the following data: 150 m/s at 0 seconds, 100 m/s at 1 second, 50 m/s at 2 seconds, 25 m/s at 3 seconds, 10 m/s at 4 seconds, and 0 m/s at 5 seconds.
25. Draw.
18. Does friction increase OR decrease an object's speed?
18. Decreases
26. What must you know to determine the gravitational force between 2 objects? (Short Answer)
26. The masses of the objects and the distance between them.
32. You are on a picnic and a wind blows your napkin away. What type of force has been applied to your napkin?
32. An unbalanced force
27. What does a graph that shows positive acceleration look like? (Short Answer)
27. It will show speed increasing as time increases.
17. Does friction still exist when an object is very smooth?
17. Yes. It's not as much as it is on a rough surface but it still has some friction.
33. What is the difference between speed and velocity? (Short Answer)
33. Speed is the distance traveled divided by the time it took to travel the distance. Velocity is speed plus direction.
16. Does friction increase OR decrease when you add mass to an object?
16. It increases.
34. If you run the 400 meter relay in 40 seconds, what is your speed?
34. 10 m/s
15. What type of motion are the blades of a windmill an example of?
15. Centripetal Motion
35. You help Mr. Mooney move a piano. You exert 35N of force pushing one end of the piano while Mr. Mooney exerts 25N of force pulling the other end. What is the net force on the piano?
35. 60N
14. The 6th grade is going to have a tug of war with the 7th grade. What type of force must we have to win?
14. We must have a greater net force in the opposite direction from the 7th grade!
36. If a car traveling 50 m/s North increases its speed to 70m/s, what has changed?
Speed Velocity Acceleration
36. All three
13. What is the definition of an unbalanced force?
13. When the net force on an object is not zero.
37. Gravitational force ______________ as mass increases.
37. Increases
24. Are the planets held in their orbits by a balanced force or an unbalanced force?
24. Unbalanced force --They are moving.