Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
37 Cards in this Set
- Front
- Back
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)
|
6.
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? |
29.
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.
|