Show:
Free Fall
Gravitational Force
Speed/Velocity
Acceleration
100

What is special about free fall?

Only considers gravitational force and ignores the others.

100
What is always an opposing force of gravity?
Air Resistance
100
What is the velocity of a car when it remains at rest?
Zero Velocity
100
What is the acceleration of gravity?
9.81 m/s^2 downward
200
Which object will hit the ground first in free fall if it was dropped at the same height? A leaf or an elephant?
Both at the same time.
200
Where does the gravitational force of Earth pull toward?
At the center of the Earth.
200
What is the difference between speed and velocity?
Speed has only magnitude, but velocity has both magnitude and direction.
200
What is acceleration?
Change in velocity
300
Does how heavy an object is affect the acceleration during free fall?
No, it does not affect acceleration. Acceleration will always be the same during free fall.
300
Is gravitational force of everyone the same?
No, gravitational force(weight) of everyone is different. It depends on your mass.
300
You throw a ball up. When does a ball have a velocity of zero?
At the highest point where the object stops going up.
300
If the speed of the car is NOT zero, can the acceleration be zero?
Yes, it means the car will be moving at a constant speed and there is no change in its speed.
400
During a game in volleyball, you slam the ball with your hand towards the opposing team. Does the motion of the ball will be considered as free fall?
No, you exerted force on the ball.
400
What is another way to say "the strength of gravitational force acting on you"?
Weight
400
What does speedometer in the car measures? Speed or Velocity?
Speed, it only tells you how fast you are going, not the direction.
400
When is the acceleration at the highest during free fall?
The acceleration is always the same at any point during free fall.
500

During free fall, the amount of air resistance is dependent upon the ________ of the falling object and the ___________ of the falling object.

speed, surface area

500

True or False. When dropped from a cliff, an elephant and a feather will both experience the same gravitational force, yet the feather experiences a greater air resistance.

False, the gravitational force is dependent on (mass x acceleration due to gravity, mg). Gravitational force is not the same as gravitational acceleration.

500

True or False. When dropped from a cliff, a feather experiences more air resistance than the elephant and thus reaches a smaller terminal velocity. 

False

500

The acceleration of a football traveling through the air decreases as the object reaches its highest point. True or False

False, the acceleration remains constant through the entire trajectory of the ball.