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

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

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

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

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

What is the force that opposes motion?

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

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

<p>It decelerates (C)</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 (D)</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 (D)</p> Signup and view all the answers

What is required to maintain a steady speed?

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

What is the result of friction between solid surfaces?

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

How can friction between solid surfaces be reduced?

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

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

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

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

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

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

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

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

<p>A parachute (C)</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 (A)</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 (B)</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 (B)</p> Signup and view all the answers

What is the result of high drag on an object?

<p>Lower top speed (D)</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 (C)</p> Signup and view all the answers

What is the purpose of deflectors on lorries and caravans?

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

What is an example of an object with high drag?

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

What happens to the surfaces in contact when friction occurs?

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

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