Gravity & SVA Review

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

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

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

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

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

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

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

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 1 2 3 Two Three All hit at the same time

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

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

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.

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.

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

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

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

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

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

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)

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)

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)

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)

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)

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)

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)

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)

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

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