Podcast
Questions and Answers
What are the forces acting on the crate pushed to the right at a constant speed?
What are the forces acting on the crate pushed to the right at a constant speed?
- Down- Gravity (correct)
- Right- Applied (correct)
- Left- Friction (correct)
- Up- Normal (correct)
What are the forces acting on the dresser being accelerated to the right?
What are the forces acting on the dresser being accelerated to the right?
- Up- Normal (correct)
- Down- Gravity (correct)
- Left- Friction (correct)
- Right- Applied + Extended (correct)
What forces are present when a rightward-moving car is skidding to a stop?
What forces are present when a rightward-moving car is skidding to a stop?
- Down- Gravity (correct)
- Left- Friction (correct)
- Up- Normal (correct)
What force is acting on a football moving upward and rightward?
What force is acting on a football moving upward and rightward?
What are the forces acting on a small freight elevator moving upward?
What are the forces acting on a small freight elevator moving upward?
What forces act on a skydiver falling downward at a constant speed?
What forces act on a skydiver falling downward at a constant speed?
What forces are present when a hockey puck glides to the right at constant speed?
What forces are present when a hockey puck glides to the right at constant speed?
What forces act on a sledder coasting down a hill and slowing down?
What forces act on a sledder coasting down a hill and slowing down?
What force acts on a football at the peak of its trajectory?
What force acts on a football at the peak of its trajectory?
What forces are acting on a skydiver who has just opened a parachute?
What forces are acting on a skydiver who has just opened a parachute?
What forces act on a small freight elevator that is moving upward while slowing down?
What forces act on a small freight elevator that is moving upward while slowing down?
What forces act on a softball player diving head-first across the field?
What forces act on a softball player diving head-first across the field?
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Study Notes
Free Body Diagrams of Various Scenarios
-
Rightward Force on Crate:
- Forces: Up (Normal), Left (Friction), Down (Gravity), Right (Applied).
- Conditions: Constant speed applied force, air resistance ignored.
-
Rightward Force on Dresser:
- Forces: Up (Normal), Left (Friction), Down (Gravity), Right (Applied + Extended).
- Conditions: Acceleration to the right, air resistance ignored.
-
Skidding Car:
- Forces: Up (Normal), Left (Friction), Down (Gravity).
- Conditions: Rightward motion with locked wheels, air resistance ignored.
-
Football Trajectory:
- Forces: Down (Gravity).
- Conditions: Moving upward and rightward towards peak, air resistance ignored.
-
Elevator Cabin:
- Forces: Up (Tension), Down (Gravity).
- Conditions: Moving upward at constant speed, no contact with shaft, air resistance ignored.
-
Skydiver at Constant Speed:
- Forces: Up (Air Resistance), Down (Gravity).
- Conditions: Downward descent with no speed change.
-
Hockey Puck on Ice:
- Forces: Up (Normal), Down (Gravity).
- Conditions: Gliding to the right at constant speed, air resistance ignored.
-
Sledder on Hill:
- Forces: Up (Normal), Left (Friction), Down (Gravity).
- Conditions: Coasting to the right while slowing down after hill descent, air resistance ignored.
-
Football at Peak of Trajectory:
- Forces: Down (Gravity).
- Conditions: Initially kicked at a 40-degree angle, air resistance ignored.
-
Skydiver with Open Parachute:
- Forces: Up (Air Resistance + Extended), Down (Gravity).
- Conditions: Slowing down after parachute deployment.
-
Elevator Cabin Slowing Down:
- Forces: Up (Tension), Down (Gravity + Extend).
- Conditions: Moving upward while decelerating, no contact with shaft, air resistance ignored.
-
Softball Player Diving:
- Forces: Up (Normal), Left (Friction), Down (Gravity).
- Conditions: Head-first slide to the right, air resistance ignored.
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