Podcast
Questions and Answers
What are the forces acting on a girl suspended motionless from the ceiling by two ropes?
What are the forces acting on a girl suspended motionless from the ceiling by two ropes?
- Only the upward tension forces in the ropes
- The downward force of gravity and the upward tension forces (correct)
- Only the downward force of gravity
- A net upward force resulting from the tension exceeding gravity
Which forces are acting on an egg that is free-falling from a tree?
Which forces are acting on an egg that is free-falling from a tree?
- The downward force of gravity, without any opposing forces (correct)
- The downward force of gravity and an upward force from the nest
- Only the upward force of air resistance
- A constant force push adding to the falling motion
What forces act upon a skydiver descending with constant velocity?
What forces act upon a skydiver descending with constant velocity?
- Only the downward force of gravity
- A net upward force causing upward acceleration
- An upward force of air resistance equal to the force of gravity (correct)
- An unbalanced force pushing the skydiver downward
When a rightward force is applied to a book moving across a desk at constant velocity, what forces are at play?
When a rightward force is applied to a book moving across a desk at constant velocity, what forces are at play?
What forces are acting on a car coasting to the right and slowing down?
What forces are acting on a car coasting to the right and slowing down?
Flashcards
Forces on a resting book
Forces on a resting book
The forces acting on a book at rest on a table are balanced. Gravity pulls down, and the table pushes up with an equal and opposite force. No net force.
Forces on a suspended girl
Forces on a suspended girl
Two ropes pull upward on a girl suspended motionless. The ropes' upward forces balance the girl's weight, preventing acceleration.
Forces on a falling egg
Forces on a falling egg
Only gravity is acting on a falling egg. Air resistance is neglected.
Forces on a gliding squirrel
Forces on a gliding squirrel
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Forces on accelerating book
Forces on accelerating book
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Study Notes
Forces on Objects
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Book on Tabletop: Forces include normal force (perpendicular to the surface) and gravitational force (downward).
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Girl on Bar: Forces include gravitational force (downward) and two tension forces (upward, from the ropes).
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Free-Falling Egg: Forces include gravitational force (downward).
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Flying Squirrel: Forces include gravitational force (downward) and air resistance (opposite direction of motion).
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Book with Rightward Force: Forces include normal force, frictional force (opposite direction of motion), applied force (rightward), and gravitational force (downward).
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Physics Student's Backpack: Forces include gravitational force (downward) and tension force (upward, from the strap).
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Skydiver: Forces include gravitational force (downward) and air resistance (opposite direction of motion). The object is falling at a constant velocity.
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Sled: Forces include gravitational force (downward), normal force, applied force (rightward), and frictional force (opposite direction of motion). The object is accelerating to the right.
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Football: Forces include gravitational force (downward) and as it rises, there is a force of air resistance (opposite direction of motion).
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Coasting Car: Forces include gravitational force (downward), normal force, frictional force which opposes the motion (leftward if the car is going to the right), as it slows down.
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