Physics 10th Class: Forces and Motion

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Questions and Answers

What is the resultant force when all acting forces on an object are balanced?

  • The resultant force is zero. (correct)
  • The resultant force equals the largest acting force.
  • The resultant force is equal to the sum of all forces.
  • The resultant force is infinite.

Which type of friction is responsible for preventing an object from moving completely until a sufficient force is applied?

  • Static friction (correct)
  • Fluid friction
  • Rolling friction
  • Sliding friction

Which statement concerning friction is accurate?

  • Friction opposes the motion between two surfaces in contact. (correct)
  • Friction can only act when surfaces are in motion.
  • Friction always acts in the same direction as the object's motion.
  • Rough surfaces produce less friction compared to smooth surfaces.

In which scenario would sliding friction be greater than rolling friction?

<p>A box sliding on a flat table. (D)</p> Signup and view all the answers

What happens to an object's motion when unbalanced forces act on it?

<p>The object's speed may change or it may change direction. (A)</p> Signup and view all the answers

Which type of friction acts on objects moving through a fluid such as air or water?

<p>Fluid friction (C)</p> Signup and view all the answers

Which condition is most likely to increase the amount of friction between two surfaces?

<p>Increasing the roughness of the surfaces. (B)</p> Signup and view all the answers

Which of the following statements is true regarding static and sliding friction?

<p>Static friction prevents movement until overcome. (A)</p> Signup and view all the answers

What effect does increasing the force pressing two surfaces together have on friction?

<p>It increases friction. (B)</p> Signup and view all the answers

Lubricants increase friction between surfaces.

<p>False (B)</p> Signup and view all the answers

Explain how wheels help to reduce friction.

<p>Wheels change sliding motion to rolling motion, which reduces friction.</p> Signup and view all the answers

An object at rest will stay at rest unless acted upon by a net _____ force.

<p>unbalanced</p> Signup and view all the answers

Match the following types of friction with their descriptions:

<p>Static Friction = Friction that prevents motion until a certain force is applied Sliding Friction = Friction that occurs when two surfaces slide past each other Rolling Friction = Friction that occurs when an object rolls over a surface Fluid Friction = Friction that acts on objects moving through a fluid medium</p> Signup and view all the answers

What unit is used to measure force?

<p>Newtons (D)</p> Signup and view all the answers

Static friction allows an object to move when a sufficient force is applied.

<p>False (B)</p> Signup and view all the answers

What is the formula used to calculate force?

<p>Force = mass x acceleration</p> Signup and view all the answers

The force that opposes motion between two surfaces in contact is called __________.

<p>friction</p> Signup and view all the answers

Which type of friction is typically less than sliding friction?

<p>Rolling Friction (C)</p> Signup and view all the answers

Match the following types of friction to their correct description:

<p>Static Friction = Prevents an object from moving Sliding Friction = Acts between sliding surfaces Rolling Friction = Acts on rolling objects Fluid Friction = Acts on objects moving through a fluid</p> Signup and view all the answers

A resultant force of zero means the object will change its motion.

<p>False (B)</p> Signup and view all the answers

What happens when unbalanced forces act on an object?

<p>The object accelerates in the direction of the greater force.</p> Signup and view all the answers

Flashcards

Force

A push or a pull that can change the motion of an object.

Resultant Force

The single force that has the same effect as all the forces acting together.

Balanced Forces

Forces that result in a zero resultant force, causing no change in motion.

Unbalanced Forces

Forces that result in a non-zero resultant force, causing a change in motion.

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Friction

A force that opposes motion between two surfaces in contact.

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Static Friction

Friction that prevents an object from moving when a force is applied.

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Sliding Friction

Friction that opposes the motion of a sliding object.

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Fluid Friction

Friction that opposes the motion of an object moving through a liquid or gas.

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What is Force?

A push or pull that can change an object's motion or shape.

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How is force measured?

Force is measured in Newtons (N).

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Force Formula

Force = Mass x Acceleration.

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What is Friction?

A force that opposes motion between surfaces in contact.

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Types of Friction

There are different types of friction including static, sliding, rolling, and fluid friction.

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Force Pressing Surfaces

The harder two surfaces are pressed together, the greater the friction. This is due to increased contact points, leading to higher friction.

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Friction Uses

Friction is crucial for daily life. It helps us walk, stop cars from skidding, and keeps objects stable. Without friction, things would slide everywhere.

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Reducing Friction

Lubricants (like oil) and wheels reduce friction. Lubricants create a layer between surfaces, reducing contact and minimizing friction. Wheels change sliding to rolling, making movement easier.

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Newton's First Law

An object at rest stays at rest, and an object in motion stays in motion at constant speed and direction unless acted upon by a force. This means objects don't change their motion without a push or pull.

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Study Notes

Force and Resultant Forces

  • A force is a push or a pull that can change the motion of an object.
  • Forces are measured in Newtons (N).
  • Several forces can act on an object at the same time.
  • The resultant force is the single force that has the same effect as all the forces acting together.
  • If the forces are balanced, the resultant force is zero, and the object will either stay still or continue moving at a constant speed in a straight line.
  • If the forces are unbalanced, the resultant force is not zero, and the object's motion will change. This change could be a change in speed or direction.

Friction

  • Friction is a force that opposes motion between two surfaces that are in contact.
  • Friction always acts in the opposite direction to the motion.
  • Friction is a necessary force in many situations. For example, it allows us to walk without slipping, and it slows down cars when the brakes are applied.
  • The amount of friction depends on the nature of the surfaces in contact and the force pressing them together.
  • Rough surfaces generally produce more friction than smooth surfaces.
  • A larger force pressing the surfaces together usually produces more friction.

Types of Friction

  • Static friction: This is the force that prevents an object from moving when a force is applied to it. To start moving an object, you must apply a force strong enough to overcome static friction.
  • Sliding friction: This is the force that opposes the motion of an object sliding over a surface. Sliding friction tends to be less than static friction between the same surfaces.
  • Rolling friction: This is the force that opposes the motion of a rolling object. Rolling friction is generally much smaller than sliding friction between the same surfaces. Rolling on wheels helps reduce friction significantly compared to sliding or dragging.
  • Fluid friction: This is the force that opposes the motion of an object moving through a liquid or a gas. Examples include air resistance (a type of fluid friction) and water resistance. The faster an object moves through a fluid, the greater the fluid friction. Air resistance increases as the speed of the object increases.

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