| Free Fall | Air resistance | Problems | ||
| 10 | 10 | 10 | 10 | 10 |
| 20 | 20 | 20 | 20 | 20 |
| 30 | 30 | 30 | 30 | 30 |
| 40 | 40 | 40 | 40 | 40 |
| 50 | 50 | 50 | 50 | 50 |
| Final Question | ||||
What is the acceleration of an object in free fall near Earth's surface?
What is the acceleration of an object in free fall near Earth's surface?
9.8 m/s^2
Is an object in free fall effected by air resistance?
Is an object in free fall effected by air resistance?
No.
If a hammer and a feather are dropped at the same time on the moon where there is no air resistance, which will hit the ground first?
If a hammer and a feather are dropped at the same time on the moon where there is no air resistance, which will hit the ground first?
They hit at the same time.
A ball is thrown vertically upward. What is happening to the balls velocity as it moves upward?
A ball is thrown vertically upward. What is happening to the balls velocity as it moves upward?
It is slowing down at a rate of 9.8 m/s^2
When an object is thrown upward into the air, what is true about the velocity at the maximum height?
When an object is thrown upward into the air, what is true about the velocity at the maximum height?
The velocity is zero at the maximum height.
Is an object that is experiencing air resistance in free fall?
Is an object that is experiencing air resistance in free fall?
No.
Does the strength of the air resistance increase or decrease as an object moves faster?
Does the strength of the air resistance increase or decrease as an object moves faster?
The strength increases.
Ball A and ball B of the same size and shape are dropped on the Earth and are effected by air resistance. If ball A is heavier than ball B, which will hit the ground first?
Ball A and ball B of the same size and shape are dropped on the Earth and are effected by air resistance. If ball A is heavier than ball B, which will hit the ground first?
Ball A.
A penny is thrown off a very tall building and begins accelerating toward the surface of the Earth. As it falls it speeds up and the air resistance increases. What is it called when the air resistance cancels out the acceleration due to gravity and therefore the object stops accelerating?
A penny is thrown off a very tall building and begins accelerating toward the surface of the Earth. As it falls it speeds up and the air resistance increases. What is it called when the air resistance cancels out the acceleration due to gravity and therefore the object stops accelerating?
Terminal velocity.
Seagulls are often observed dropping clams and other shellfish from a height to the rocks below, as a means of opening the shells. If a seagull drops a shell from rest at a height of 21 m, how fast is the shell moving when it hits the rocks?
Seagulls are often observed dropping clams and other shellfish from a height to the rocks below, as a means of opening the shells. If a seagull drops a shell from rest at a height of 21 m, how fast is the shell moving when it hits the rocks?
20.3 m/s
To celebrate a victory, a pitcher throws her glove straight upward with an initial speed of 5.7 m/s. How long does it take for the glove to return to the pitcher?
To celebrate a victory, a pitcher throws her glove straight upward with an initial speed of 5.7 m/s. How long does it take for the glove to return to the pitcher?
1.16 s
A volcano ejects a lava bomb straight upward with an initial speed of 54.2 m/s. Taking upward to be the positive direction, find velocity of the lava bomb 2.8 seconds later.
A volcano ejects a lava bomb straight upward with an initial speed of 54.2 m/s. Taking upward to be the positive direction, find velocity of the lava bomb 2.8 seconds later.
26.8 m/s
A batter pops a ball straight up. If the ball returns to the height from which it was hit 1.98 s later, what was its initial speed?
A batter pops a ball straight up. If the ball returns to the height from which it was hit 1.98 s later, what was its initial speed?
9.7 m/s
Wrongly called for a foul, an angry basketball player throws the ball straight down to the floor. If the ball bounces straight up and returns to the floor 1.2 s after first striking it, what was the ball’s greatest height above the floor?
Wrongly called for a foul, an angry basketball player throws the ball straight down to the floor. If the ball bounces straight up and returns to the floor 1.2 s after first striking it, what was the ball’s greatest height above the floor?
1.76 m
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