Types of Forces

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Questions and Answers

What type of force helps a moving object to stop?

  • Magnetic force
  • Gravity
  • Friction (correct)
  • Applied force

Which force helps a stationary object to move?

  • Friction
  • Gravity
  • Magnetic force
  • Applied force (correct)

What type of force is demonstrated when rubbing hands together?

  • Gravity
  • Friction (correct)
  • Magnetic force
  • Applied force

Which force helps change the shape of an object?

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

Which simple machine involves a bar turning around a point called the fulcrum?

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

When is work considered done on an object?

<p>When an object moves due to applied force (B)</p> Signup and view all the answers

What is force according to the text?

<p>A push or pull on an object (B)</p> Signup and view all the answers

How is force useful to us based on the text?

<p>Force changes the direction of objects (C)</p> Signup and view all the answers

What causes a moving object to stop or change direction according to the text?

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

What type of force helps make things go faster or slower?

<p>Applied force (A)</p> Signup and view all the answers

Which action requires force according to the text?

<p>Pushing a shopping cart (D)</p> Signup and view all the answers

Which scenario illustrates the use of force changing the shape of an object?

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

What is the force that pulls everything towards the center of the Earth?

<p>Gravitational force (A)</p> Signup and view all the answers

Why does a ball fall to the ground when thrown up in the air?

<p>Due to gravitational force (C)</p> Signup and view all the answers

What is the force that acts between two objects to slow down or stop one of them?

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

What is the role of friction in helping you hold a pencil?

<p>To enhance grip (D)</p> Signup and view all the answers

Why does a ball rolling on the ground eventually slow down and stop?

<p>Due to frictional force (B)</p> Signup and view all the answers

Why does the force of gravity become weaker as something moves farther away from the Earth?

<p>Due to reduced gravitational pull (D)</p> Signup and view all the answers

Flashcards

What is Friction?

A force that opposes motion, causing moving objects to slow down and stop.

What is Applied Force?

A force exerted on an object to cause it to move from a resting position.

What is a Lever?

A simple machine consisting of a bar that pivots around a fixed point (fulcrum) to multiply force.

What is Work?

Work is done when a force causes an object to move a certain distance.

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What is Force?

A push or pull exerted on an object that can change its motion or shape.

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How is Force Useful?

Force can alter the direction of an object's movement.

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What is Friction's Effect?

A force that resists motion when two surfaces are in contact.

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What Does Applied Force Do?

A force that increases or decreases the speed of an object.

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What Requires Force?

A force used, for example, to move or control an object.

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Force and Shape Change

Force applied to an object to change its form or shape.

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What is Gravitational Force?

The force that attracts objects with mass towards each other.

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What is Frictional Force?

A force that slows down or stops moving objects due to surface interactions.

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Friction and Grip

Friction provides the necessary grip to hold objects.

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Gravity and Distance

As distance increases, the gravitational force weakens.

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Study Notes

Types of Forces

  • There are two main types of forces: Gravitational force (Gravity) and Frictional force (Friction)

Gravitational Force (Gravity)

  • Gravity is the force that pulls everything towards the center of the Earth
  • It is what keeps us on the ground and prevents us from floating away
  • Gravity gets weaker as the distance from the Earth increases
  • Astronauts float in space because of the weaker gravity
  • Gravity is a pulling force

Frictional Force (Friction)

  • Friction is the force that acts between two objects to slow down or stop one of them
  • Friction occurs when two surfaces are in contact with each other
  • Friction helps us hold objects, like a pencil, without them slipping away
  • Friction is necessary, but too much friction can be bad

Work

  • Work is done when a force is applied to an object and the object moves
  • If the force is applied but the object does not move, work is not done
  • Work is done when the force is applied in the direction of the object's movement

Simple Machines

  • Simple machines are tools that help us do work easier and faster
  • Examples of simple machines include: lever, inclined plane, pulley, wheel-and-axle, screw, and wedge
  • A lever is a simple machine that helps us lift, pull, or push things

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