Forces
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Questions and Answers

What primarily determines the amount of friction between two surfaces?

  • The presence of moisture on the surfaces
  • The speed at which the surfaces move
  • The types of surfaces in contact (correct)
  • The temperature of the surfaces

Which of the following is NOT a disadvantage of friction?

  • Causes wear and tear
  • Produces unwanted heat
  • Slows down motion unnecessarily
  • Provides grip on objects (correct)

Which method does NOT reduce friction?

  • Increasing surface roughness (correct)
  • Using ball bearings
  • Adding rollers or wheels
  • Applying lubricating oil

What is the effect of friction on a moving object?

<p>It causes the object to slow down or stop (B)</p> Signup and view all the answers

Air resistance and water resistance are examples of what type of force?

<p>Frictional forces (A)</p> Signup and view all the answers

What effect can forces have on an object?

<p>Change the shape of an object (B)</p> Signup and view all the answers

What defines the weight of an object?

<p>The gravitational force acting on the object (D)</p> Signup and view all the answers

How does the weight of an object change when it is moved from Earth to the Moon?

<p>It decreases significantly (C)</p> Signup and view all the answers

What is the relationship between mass and gravitational force?

<p>Greater mass results in greater gravitational force (A)</p> Signup and view all the answers

Which unit is used to measure weight?

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

What happens to a spring when a force is applied to stretch it?

<p>It exerts elastic spring force. (B)</p> Signup and view all the answers

How does the weight of an object affect the extension of a spring?

<p>Greater weight results in longer extension of the spring. (A)</p> Signup and view all the answers

What type of interaction occurs between two like poles of magnets?

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

In what situation would a spring be used as a balance?

<p>To measure the weight of an object hung on it. (B)</p> Signup and view all the answers

What occurs when opposite poles of two magnets are brought close together?

<p>They attract each other. (B)</p> Signup and view all the answers

What is the main purpose of rough strips placed on the edges of stairs?

<p>To increase friction and prevent slipping (C)</p> Signup and view all the answers

How does chalk help athletes in sports like gymnastics or rock climbing?

<p>It absorbs moisture to increase friction for better grip (B)</p> Signup and view all the answers

Why are wheelchair ramps designed with textured surfaces?

<p>To increase friction and prevent slipping (D)</p> Signup and view all the answers

What is the purpose of using snow chains on car tires?

<p>To enhance friction and improve grip on icy surfaces (A)</p> Signup and view all the answers

What is a potential consequence of worn strips on stairs?

<p>They will become smoother, reducing friction (A)</p> Signup and view all the answers

Flashcards

Gravitational force

The force that pulls objects towards the Earth.

Weight

The amount of gravitational force acting on an object.

Mass

The amount of matter in an object.

Weight unit

Newton (N).

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Mass unit

Kilogram (kg) or Gram (g).

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Friction

A force that opposes motion between surfaces in contact.

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Amount of Friction

Determined by the roughness of surfaces. Rougher surfaces create more friction.

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Air Resistance

A type of friction caused by air interacting with a moving object.

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Friction's Effect on Motion

Friction slows down or stops objects in motion.

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Reducing Friction

Using lubricants, rollers, or ball bearings to decrease friction.

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Elastic Material

A material that can change shape when a force is applied and return to its original shape when the force is removed.

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Elastic Spring Force

The force exerted by a spring when it is stretched or compressed.

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What happens when a spring is stretched?

The longer a spring is stretched, the larger the force it exerts.

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Magnet Interaction

Magnets attract or repel each other depending on their poles.

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Magnetic Force

The force exerted by magnets that can attract or repel objects at a distance.

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Rough Staircase Strips

Rough strips are placed on stairs to create more friction between the soles of shoes and the stairs, preventing slipping and falling.

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Chalk in Sports

Athletes use chalk to increase friction between their hands and equipment like gymnastic bars or climbing walls, improving grip.

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Textured Wheelchair Ramps

Wheelchair ramps have textured surfaces to increase friction between the wheelchair's wheels and the ramp, preventing sliding and making it easier for the wheelchair to ascend the ramp.

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Snow Chains on Tires

Snow chains are used on car tires in icy conditions to increase friction between the tires and the road, reducing the risk of skidding.

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Friction and Wear and Tear

Over time, friction can cause surfaces to wear down and become smoother, reducing the amount of friction.

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