page 4 physics text book
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Questions and Answers

What is a force?

  • A type of energy
  • A type of motion
  • A push or a pull (correct)
  • A type of speed

    • What type of force acts perpendicular to a surface and away from it?

  • Thrust
  • Gravity
  • Reaction force (correct)
  • Electrostatic force

    • What is the force that slows down an object?

  • Drag or air resistance (correct)
  • Tension
  • Thrust
  • Lift

    • What type of force is responsible for the upward motion of an aeroplane?

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

    What type of force is responsible for the motion of a rocket?

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

    What is the force that holds a rope or cable taut?

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

    What is the force that opposes motion?

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

    What happens to an object with no force propelling it along?

    <p>It decelerates</p> Signup and view all the answers

    Why do objects with weight not fall through the surface they're on?

    <p>Because of a reaction force</p> Signup and view all the answers

    What is the force that acts in the opposite direction to an object's motion in a fluid?

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

    What is required to maintain a steady speed?

    <p>A driving force</p> Signup and view all the answers

    Why does an object slow down and stop if it has no force propelling it?

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

    What is the purpose of a driving force when an object travels at a steady speed?

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

    What is the result of friction between solid surfaces?

    <p>Wear of the surfaces in contact</p> Signup and view all the answers

    How can friction between solid surfaces be reduced?

    <p>By using a lubricant</p> Signup and view all the answers

    What is the most important factor in reducing drag in fluids?

    <p>The shape of the object</p> Signup and view all the answers

    What type of friction occurs when an object moves in a fluid?

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

    What is the main purpose of deflectors on lorries and caravans?

    <p>To reduce drag and make the vehicle more streamlined</p> Signup and view all the answers

    What happens to friction in a fluid as the speed increases?

    <p>It increases</p> Signup and view all the answers

    What is the opposite extreme to a sports car in terms of drag?

    <p>A parachute</p> Signup and view all the answers

    What is the purpose of a lubricant like oil or grease between two solid surfaces?

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

    What is the main way to reduce drag in fluids?

    <p>By keeping the shape of the object streamlined</p> Signup and view all the answers

    What is the effect of a roof box on a car?

    <p>It decreases the car's speed</p> Signup and view all the answers

    What is the result of high drag on an object?

    <p>Lower top speed</p> Signup and view all the answers

    What is the relationship between drag and top speed for a given thrust?

    <p>Higher drag results in lower top speed</p> Signup and view all the answers

    What is the purpose of deflectors on lorries and caravans?

    <p>To reduce drag</p> Signup and view all the answers

    What is an example of an object with high drag?

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

    What happens to the surfaces in contact when friction occurs?

    <p>They wear out</p> Signup and view all the answers

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