Drawing Vectors and Scale Importance in Physics
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Questions and Answers

What is the weight (𝑾) of a body defined as?

  • The mass of the body multiplied by acceleration due to gravity
  • The mass of the body divided by the acceleration due to gravity
  • The gravitational force acting on a body due to all other bodies in space (correct)
  • The distance the body travels in space
  • What is the unit of force in the metric system?

  • Poundal
  • Dyne
  • Slug
  • Newton (correct)
  • According to Newton's Third Law of Motion, what can be said about the two forces involved?

  • They are unequal in magnitude and opposite in direction
  • They are unequal in magnitude and direction
  • They are equal in magnitude and direction
  • They are equal in magnitude and opposite in direction (correct)
  • In the equation 𝑊 = 𝑚𝑔, what does 'm' represent?

    <p>Mass of the body</p> Signup and view all the answers

    What is the unit of acceleration in the imperial system?

    <p>Feet/square second</p> Signup and view all the answers

    How is weight (𝑾) mathematically calculated using mass (𝑚) and gravity (𝑔)?

    <p>$𝑊 = 𝑚𝑔$</p> Signup and view all the answers

    What type of collision is it when the final kinetic energy is less than the initial kinetic energy?

    <p>Completely inelastic</p> Signup and view all the answers

    In a perfectly inelastic collision, what happens to the two objects involved?

    <p>They stick together</p> Signup and view all the answers

    What is the total momentum of two bodies before and after a collision?

    <p>It remains the same</p> Signup and view all the answers

    What does the coefficient of restitution (e) measure in a collision?

    <p>Relative velocity of separation to approach</p> Signup and view all the answers

    In the equation 𝑚1𝑣1 − 𝑚2𝑣2 = 𝑚2𝑢2 − 𝑚1𝑢1, what does 𝑣1 represent?

    <p>Final velocity of body 1</p> Signup and view all the answers

    What was the initial speed of the ship towards the reef?

    <p>2.5 m/s</p> Signup and view all the answers

    What was the total constant force exerted by the wind towards the reef?

    <p>9.00 x 10^3 N</p> Signup and view all the answers

    What was the total force exerted by the frictional drag force of water on the propeller?

    <p>1.25 x 10^5 N</p> Signup and view all the answers

    What was the mass of the ship and its cargo?

    <p>5.50 x 10^7 kg</p> Signup and view all the answers

    What was the distance of the ship from the reef when the rudder jammed?

    <p>900 m</p> Signup and view all the answers

    What action did the captain claim to take when he lost control of the ship's direction?

    <p>Put engines in reverse at maximum power</p> Signup and view all the answers

    What is the purpose of using a scale when drawing vectors?

    <p>To ensure the vectors fit within the available space</p> Signup and view all the answers

    What is the resultant force in the x-direction (ΣFx) for a series of forces with values 100, -150, -200, and angles of 0°, 30°, 60°, respectively?

    <p>-129.90</p> Signup and view all the answers

    What is the resultant force in the y-direction (ΣFy) for a series of forces with values 100, -150, -200, and angles of 0°, 30°, 60°, respectively?

    <p>-201.79</p> Signup and view all the answers

    What is one application of kinematics on vertical motion of bodies?

    <p>Describing the motion of a ball thrown vertically upwards</p> Signup and view all the answers

    What is the main objective of the lesson 'Rectilinear Motion and Projectile'?

    <p>All of the above</p> Signup and view all the answers

    How can a passenger on a vehicle compute the distance between equally spaced electric posts?

    <p>By using a stopwatch to record the time elapsed at every post</p> Signup and view all the answers

    What total force must the ropes holding a swing be able to withstand if the horizontal speed at the lowest point is 3 m/s?

    <p>20 N</p> Signup and view all the answers

    What is the highest speed a 200-gram ball can have at the end of a 1000 cm long string if the string has a breaking point of 4 N?

    <p>2 m/s</p> Signup and view all the answers

    If a 1000-g ball is tied to a string and whirled in a vertical circle at 1 revolution per second, what is the speed of the body at the highest point if the tension at the highest point is zero?

    <p>4.4 m/s</p> Signup and view all the answers

    If a body is moving along a circular path with a centripetal force three times its weight, what is the period of motion if the radius of the circle is 2.86 m?

    <p>2.0 s</p> Signup and view all the answers

    Find the angle of banking for a curve along a highway designed for cars moving at 100 kilometers per hour, given that the radius of the curve is 200 m.

    <p>20°</p> Signup and view all the answers

    While working as a delivery person, what is the minimum angle of banking needed for your truck to safely navigate a curve with a radius of 50 meters while carrying a crate of eggs?

    <p>10°</p> Signup and view all the answers

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