1. Gravity & SVA Review

2. The measure of gravity acting on mass is_________.
pressure
weight
volume
amplitude

3. Mars has 1/3 the gravity of Earth
Mars has 1/3 the gravity of Earth. On Mars you would expect your mass___________ but your weight to be __________ compared to Earth.
To increase by 3 times … the same
To decrease by 1/3 … more
To be the same … 1/3 as much
To be the same … the same

4. An object accelerates when it falls because of_____________.
Balanced forces
Four different forces
Air resistance
Unbalanced forces

5. Which pair of objects has the greatest gravitational force between them? Assume all mass is equal.D

6. Which pair of objects has the least gravitational force between them
Which pair of objects has the least gravitational force between them? Assume all distance is equal. A B C D

7. Air resistance will have a greater effect on an object that __________.
Has a large flat surface area
Is torpedo shaped
Is sphere shaped
Has a small round surface area

8. Assuming no air resistance; if a rock falls for 2
Assuming no air resistance; if a rock falls for 2.5 seconds what is its velocity?
9.8 m/s down
29.4 m/s down
19.6 m/s down
24.5 m/s down

9. Which of the three objects shown below will hit the ground first if dropped at the same time from the same height? (assume no air resistance and size indicates mass.)
One
Two
Three
All hit at the same time

10. If Earths mass suddenly decreased by half, your weight would …
Increase because gravity decreased
Increase because gravity increases
Decrease because gravity decreases
Decrease because gravity increases

11. All objects in the universe have mass so they must all exert a _______ force.
centripetal
gravitational
magnetic
Electrical

12. As astronauts travel to the moon, what happens to their weight?
Their weight increases as they lift away from Earth and decreases as they approach the moon.
Their weight decreases as they lift away from Earth and increases as they approach the moon.
Their weight increases as they lift away from Earth and increases as they approach the moon.
Their weight remains the same throughout the trip.

13. As astronauts travel to the moon, what happens to their mass?
Their mass increases as they lift away from Earth and decreases as they approach the moon.
Their mass decreases as they lift away from Earth and increases as they approach the moon.
Their mass increases as they lift away from Earth and increases as they approach the moon.
Their mass remains the same throughout the trip.

14. Sally traveled 25 km in 20 minutes, stopped for 5 minutes, and traveled another 10 km in 20 minutes. What was her average speed?
0.67 km/min
1 km/min
1.5 km/min
No enough information

15. Flying from Atlanta to Birmingham (120 miles) took 1 hour
Flying from Atlanta to Birmingham (120 miles) took 1 hour. What was the plane’s average velocity?
120 mi/hr
1 hr/120 mi
120 mi/hr west
1 hr/120 mi west

16. Casey is riding on a merry-go-round at the playground, traveling at 2m/s. Describe Casey’s motion.
accelerating
not accelerating
free fall
constant velocity

17. Francis is walking forward at 6m/s westward on a moving sidewalk at the airport. The walkway is moving at 5m/s. What is Francis’ resultant velocity?
1 m/s
11 m/s
6 m/s westward
11 m/s westward

18. Francis is walking at 6m/s eastward on a moving sidewalk at the airport. The walkway is moving at 5m/s westward. What is Francis’ resultant velocity?
1 m/s
1 m/s eastward
1 m/s westward

19. Describe the motion of the object based on the graph.
accelerating
decelerating
constant speed
No motion
Distance (m)
Increasing speed at a constant rate (think cruise control). NOT accelerating
Time (s)

20. Describe the motion of the object based on the graph.
accelerating
decelerating
constant speed
No motion
Velocity (m/s)
Car is accelerating at a constant rate (speeding up as time goes on). Any point on the graph would have the same acceleration (ex. 4 m/s/s)
Time (s)

21. Describe the motion of the object based on the graph.
Which line represents the slowest motion?
1. Red line:
2. Yellow line:
3. Green line:
Distance (m)
Red object moving fastest, green moving slowest
Time (s)

22. Describe the motion of the object based on the graph.
Accelerate then stop
Constant speed then stop
Accelerate then constant speed
Constant speed then slow
Distance (m)
Increasing speed then stops
Time (s)

23. Describe the motion of the object based on the graph.
Accelerate then stop
Constant speed then stop
Accelerate then constant speed
Constant speed then slow
Velocity (m/s)
Object is accelerating then traveling at a constant speed
Time (s)

24. Describe the motion of the object based on the graph.
Accelerate then stop
Constant speed then stop
Constant speed away then returning
Constant speed away then slowing down
Distance (m)
Increasing speed at a constant rate then returning to start
Time (s)

25. Describe the motion of the object based on the graph.
Accelerate then slow to stop
Constant speed then stop
Constant speed away then returning
Constant speed away then slowing down
Velocity (m/s)
Car is accelerating (positive acceleration) then decelerating (slowing down) both at constant rate (is this possible?)
Time (s)

26. Describe the motion of the object based on the graph.
Accelerate
Decelerate
Constant speed
Projectile motion
Distance (m)
Object is accelerating positively (speeding up)
Time (s)

27. Describe the motion of the object based on the graph.
Accelerate
Decelerate
Constant speed
Projectile motion
Distance (m)
Object is slowing down
Time (s)

28. Graph Interpretation D C B A
Calculate the average speed at each point:
_________ D C B
Did the car accelerate or stay at a constant speed?
A. 2 m/min B. 2 m/min C. 2 m/min D. 2 m/min Constant speed (cruise control) A