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Questions and Answers
What is a free-body diagram primarily used for?
What is a free-body diagram primarily used for?
- To predict future positions of an object
- To illustrate the movement of an object
- To show the external forces acting on an object (correct)
- To represent the speed of an object
If a box is accelerating to the left, which of the following situations matches the free-body diagram showing this situation?
If a box is accelerating to the left, which of the following situations matches the free-body diagram showing this situation?
- A football flies through the air towards its peak after being punted.
- An acorn falling from an oak tree.
- A skater coasts to a stop in the rightward direction. (correct)
- A book at rest on a tabletop.
Which of the following illustrates a free-body diagram for a monkey hanging motionless from a tree branch?
Which of the following illustrates a free-body diagram for a monkey hanging motionless from a tree branch?
- Multiple forces acting at different angles.
- Unequal forces with a greater upward force.
- Only gravitational force acting downwards.
- Equal downward force of gravity and upward tension. (correct)
In a free-body diagram where a sled is being dragged to the right and accelerating, which force is likely represented?
In a free-body diagram where a sled is being dragged to the right and accelerating, which force is likely represented?
When a rock is free-falling after being dropped from a cliff, what does its free-body diagram depict?
When a rock is free-falling after being dropped from a cliff, what does its free-body diagram depict?
What characteristic distinguishes contact forces from field forces?
What characteristic distinguishes contact forces from field forces?
For which scenario would you observe a free-body diagram showing a net force acting upwards?
For which scenario would you observe a free-body diagram showing a net force acting upwards?
If a hockey puck glides to the left and slows down, what does its free-body diagram primarily depict?
If a hockey puck glides to the left and slows down, what does its free-body diagram primarily depict?
Flashcards
What is a free-body diagram?
What is a free-body diagram?
A diagram that shows all the forces acting on an object using vectors. It only shows the forces acting directly on the object, not forces that the object exerts on other objects.
What is the force of gravity?
What is the force of gravity?
The force due to gravity acting on an object's mass. It always acts downwards towards the center of the Earth.
What is friction?
What is friction?
The force that opposes the motion of an object in contact with a surface. It acts parallel to the surface and in the opposite direction to the motion.
What is the normal force?
What is the normal force?
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What is applied force?
What is applied force?
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What is a field force?
What is a field force?
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What is a contact force?
What is a contact force?
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What is a force vector?
What is a force vector?
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Study Notes
Types of Forces
- Forces are pushes or pulls that can change the motion of an object.
- Forces can be categorized into contact forces and field forces.
- Contact forces require objects to touch each other, like friction, applied force, normal force and tension force, drag force.
- Field forces act on objects from a distance, like gravity, electric force, and magnetic force.
- Examples of contact forces include:
- Friction: A force that opposes motion between surfaces in contact.
- Applied force: A force applied to an object by a person or another object.
- Normal force: A force that supports an object resting on a surface.
- Tension force: A force transmitted through a string, rope, or cable.
- Drag force: A force that opposes the motion of an object through a fluid (like air or water).
- Examples of field forces include:
- Gravity: A force of attraction between any two objects with mass.
- Electric force: A force between charged objects.
- Magnetic force: A force between magnetic objects.
- Buoyant force: An upward force exerted by a fluid that opposes the weight of an immersed object.
- Spring force: A force exerted by a compressed or stretched spring.
- Air resistance: A type of frictional force that opposes the motion of objects moving through air.
Force Vectors
- A force vector is a quantity that has both magnitude (strength) and direction.
- Representing forces with vectors is crucial in physics.
- Force vectors are represented by arrows, with the length of the arrow representing the force's magnitude, and the arrow's direction representing the force's direction.
Free-Body Diagrams
- Free-body diagrams are diagrams that represent all the forces acting on an object.
- They help to visualize the forces acting on an object.
- A free-body diagram only shows the external forces on an object; it does not show forces the object exerts on other objects.
- The object being analyzed is isolated from its surroundings, and only forces acting on it are shown.
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