Questions and Answers
What forces are acting on a sled being pulled to the right with increasing speed?
Applied force, friction, and tension.
Which of the following are examples of contact forces? (Select all that apply)
What forces are acting on a toy car being pushed across a table at constant speed?
Applied force and friction.
What is an applied force?
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What forces are acting on a girl being pulled in a basket by her brother with increasing speed?
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How does friction behave in terms of movement?
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What forces act on a gymnast hanging from a bar attached to the ceiling?
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What is air resistance?
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What forces are acting on a tire swing hanging from a tree branch?
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What is tension?
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What forces act on an apple attached to the ceiling by a string while being pulled down?
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What is normal force?
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What forces are acting on a box being pulled to the left across a table at constant speed?
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What are free body diagrams?
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What forces act on a book at rest on top of a table?
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What is net force?
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What forces act on an acorn falling towards the ground at increasing speed?
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What forces act on a tennis ball falling towards the ground?
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What forces act on a pet rock being pulled to the left with increasing speed?
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What is the SI unit for force or weight?
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Study Notes
Forces and Free Body Diagrams
- A sled being pulled with increasing speed experiences various forces that can be depicted in a free-body diagram.
- Free-body diagrams illustrate forces acting on an object with arrows indicating direction and magnitude.
Contact Forces
- Types of contact forces include:
- Applied force: Direct push or pull on an object.
- Friction: Opposes motion between surfaces in contact.
- Air resistance: Force opposing the motion of objects through air.
- Tension: Force transmitted through a rope or cable.
- Normal force: Perpendicular force exerted by a surface counteracting gravity.
Scenarios for Free-Body Diagrams
- A toy car pushed across a table at constant speed shows balanced forces: applied force equals friction.
- A girl in a basket being pulled indicates increasing speed, suggesting the applied force exceeds resistance forces.
- A gymnast hanging on a bar experiences gravitational force downward and tension force from the ropes upward.
Forces in Specific Situations
- Air resistance acts upward against the downward force of gravity, impacting falling objects.
- An apple attached to a ceiling by a string has gravitational force downward and applied force when pulled.
- A box being pulled at constant speed indicates net forces are balanced, and friction opposes the applied force.
Understanding Forces
- The net force is the sum of all forces acting on an object, determining its acceleration.
- SI unit for force is the newton (N), linking force to mass and acceleration (F=ma).
Examples of Motion
- An acorn falling shows increasing speed due to gravity, with air resistance affecting the net force.
- A tennis ball falling without air resistance demonstrates free-fall, solely governed by gravitational force.
- A pet rock pulled to the left with increasing speed illustrates unbalanced forces, resulting in acceleration.
Visualization Tools
- Simplified diagrams, known as free body diagrams, assist in visualizing forces, allowing easier analysis of motion-related problems.
Studying That Suits You
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Description
Enhance your understanding of forces and free body diagrams with this interactive practice flashcard quiz. Each card presents a scenario involving forces, helping you diagram and analyze the various forces acting on an object. Perfect for students learning physics concepts related to forces.
