Forces and Free Body Diagrams Practice

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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)

Magnetic force

Friction (correct)

Air resistance (correct)

Gravitational force

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?

A literal push or pull exerted on an object. Signup and view all the answers

What forces are acting on a girl being pulled in a basket by her brother with increasing speed?

Applied force and tension. Signup and view all the answers

How does friction behave in terms of movement?

Friction always acts in the opposite direction of movement. Signup and view all the answers

What forces act on a gymnast hanging from a bar attached to the ceiling?

Tension and gravitational force. Signup and view all the answers

What is air resistance?

An upward force that resists the downward force of gravity. Signup and view all the answers

What forces are acting on a tire swing hanging from a tree branch?

Tension and gravitational force. Signup and view all the answers

What is tension?

A pulling force caused by objects connected by a rope or cable. Signup and view all the answers

What forces act on an apple attached to the ceiling by a string while being pulled down?

Tension and gravitational force. Signup and view all the answers

What is normal force?

The upward force exerted by a surface that supports the weight of an object resting on it. Signup and view all the answers

What forces are acting on a box being pulled to the left across a table at constant speed?

Applied force and friction. Signup and view all the answers

What are free body diagrams?

Simplified diagrams that show the magnitude and direction of forces acting on an object. Signup and view all the answers

What forces act on a book at rest on top of a table?

Normal force and gravitational force. Signup and view all the answers

What is net force?

The sum of all forces acting on an object. Signup and view all the answers

What forces act on an acorn falling towards the ground at increasing speed?

Gravitational force and air resistance. Signup and view all the answers

What forces act on a tennis ball falling towards the ground?

Gravitational force. Signup and view all the answers

What forces act on a pet rock being pulled to the left with increasing speed?

Applied force and friction. Signup and view all the answers

What is the SI unit for force or weight?

Newton (N). Signup and view all the answers

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.

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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.