Forces and Friction in Physics

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Questions and Answers

What is the net force acting on an object when static friction prevents it from moving?

  • The net force is equal to the force of friction.
  • The net force is equal to the mass of the object.
  • The net force is equal to zero. (correct)
  • The net force is equal to the applied force.

Which of the following forces is an example of a non-contact force?

  • The force of a book resting on a table
  • The force of a hammer hitting a nail.
  • The force of a person pushing a shopping cart
  • The force of a magnet attracting a paperclip (correct)

What is the relationship between the mass of an object and the gravitational force it experiences?

  • The more massive an object is, the less gravitational force it experiences.
  • The more massive an object is, the more gravitational force it experiences. (correct)
  • The mass of an object has no effect on the gravitational force it experiences.
  • The relationship between mass and gravitational force is unpredictable.

How does distance affect the gravitational force between two objects?

<p>The farther apart the objects are, the weaker the gravitational force. (D)</p> Signup and view all the answers

What type of friction occurs when a car's brakes are applied?

<p>Sliding friction (A)</p> Signup and view all the answers

What is the difference between weight and mass?

<p>Weight is a force and mass is the amount of matter in an object. (B)</p> Signup and view all the answers

Which of the following is NOT an example of fluid friction?

<p>A ball rolling down a hill (D)</p> Signup and view all the answers

Which of the following is an example of static friction?

<p>A person walking on a sidewalk (D)</p> Signup and view all the answers

How can friction be reduced?

<p>By decreasing the surface area of contact. (B)</p> Signup and view all the answers

What happens to the motion of an object when a force is applied to it?

<p>The object's motion will change, either by speeding up, slowing down, or changing direction. (C)</p> Signup and view all the answers

Flashcards

Force

A push or a pull on an object, measured in newtons (N).

Contact Force

A push or pull on one object by another that is touching it.

Non-Contact Force

A push or pull on one object by another without touching.

Friction

A force that resists the motion of two objects that are touching.

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Static Friction

A type of friction that prevents objects from sliding past each other.

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Sliding Friction

Friction that opposes the motion of objects sliding past each other.

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Fluid Friction

Friction between a surface and a fluid such as water or air.

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Gravity

An attractive force that exists between all objects that have mass.

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Weight

The amount of gravitational force exerted on an object, measured in newtons (N).

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Law of Universal Gravitation

States that the gravitational force increases with mass and decreases with distance.

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Study Notes

Forces

  • Forces are pushes or pulls on objects
  • Forces are measured in newtons (N)
  • Two types of forces: contact and non-contact.

Contact Forces

  • Example: pushing a container, pressing computer keys or friction.

Non-Contact Forces

  • Example: gravity, magnetic, and electric forces.

Types of Friction

  • Friction: a force that resists motion of two objects touching.
  • Static friction: prevents objects from sliding past each other
  • Sliding friction: opposes the motion of objects sliding past each other
  • Fluid friction: friction between a surface and a fluid such as water or air (air resistance)

Static Friction vs. Sliding Friction

  • Static friction: prevents motion between two objects, Net Force = 0 N.
  • Sliding friction: opposes motion that is already happening, Net Force >/= 0 N.

Gravity

  • Gravity: an attractive force between all objects with mass.
  • Mass: the amount of matter in an object.
  • The more mass, the more gravitational pull.
  • The greater the distance, the less gravitational pull.

Weight vs. Mass

  • Weight: the amount of gravitational force exerted on an object (measured in Newtons).
  • Weight depends on gravity and Mass.
  • Mass does not change, weight changes with depending on location (gravity).

Electric Force

  • Static charge: unbalanced positive or negative charge on an object.
  • Opposite charges attract, and the same charges repel.
  • Strength of electric forces depends on amount of charge and the distance between the objects.

Magnetic Force

  • Magnet: object that attracts iron.
  • Magnetic poles: the place on a magnet with the strongest force.
  • Opposite poles attract, and the same poles repel.
  • Magnet strength is influenced by magnet size and distance, farther away the magnets are the weaker the magnetic force becomes.

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Forces Teacher Notes PDF

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