Gravity and Forces Quiz

Grade 5 · Science · Quiz

Test your understanding of forces, gravity, mass, weight, and how they affect the motion of objects.

Questions

  1. A book is sitting still on a table. Which statement best describes the forces acting on it?

    1. No forces act on the book
    2. Only gravity acts on the book pulling it down
    3. Gravity pulls down and the normal force pushes up; forces are balanced
    4. Friction acts upward to hold the book in place
    Show answer

    Answer: Gravity pulls down and the normal force pushes up; forces are balanced

    Both gravity (downward) and the normal force (upward) act on the book. Because the book is not accelerating, these forces are balanced — equal and opposite.

  2. Two equally sized objects are dropped from the same height. One is made of lead, one of wood. Ignoring air resistance, which hits the ground first?

    1. The lead object, because it is heavier
    2. The wooden object, because it is lighter
    3. They hit at the same time
    4. The lead object, because gravity pulls heavier objects harder
    Show answer

    Answer: They hit at the same time

    Gravity accelerates all objects at the same rate (9.8 m/s²) regardless of mass. Without air resistance, both objects fall at identical rates and hit at the same time.

  3. What unit is used to measure force?

    1. Kilogram
    2. Meter
    3. Newton
    4. Joule
    Show answer

    Answer: Newton

    Force is measured in Newtons (N), named after Sir Isaac Newton. Kilograms measure mass, meters measure distance, and joules measure energy.

  4. Friction always acts in the same direction as the motion of an object.

    Show answer

    Answer: False

    Friction always acts OPPOSITE to the direction of motion. If an object moves right, friction acts to the left, resisting and slowing the motion.

  5. A person weighs 600 Newtons on Earth. On the Moon, where gravity is about 1/6 of Earth's, what is their approximate weight?

    1. 600 N
    2. 100 N
    3. 3,600 N
    4. 60 N
    Show answer

    Answer: 100 N

    Weight = mass × gravity. Since Moon's gravity is 1/6 of Earth's, the person's weight is 600 ÷ 6 = 100 N. Their mass (amount of matter) remains unchanged.

  6. What does the term 'net force' mean?

    1. The largest individual force acting on an object
    2. The combined result of all forces acting on an object
    3. The force of gravity only
    4. The force of friction only
    Show answer

    Answer: The combined result of all forces acting on an object

    Net force is the vector sum of all forces acting on an object. If all forces cancel out, net force is zero and the object does not accelerate.

  7. The gravitational pull between two objects increases as their ________ increases.

    Show answer

    Answer: mass

    According to Newton's law of universal gravitation, gravitational force increases with the mass of both objects. Greater mass = greater gravitational attraction.

  8. A skydiver jumping from a plane eventually reaches 'terminal velocity' where they stop accelerating. What best explains this?

    1. Gravity stops pulling the skydiver downward
    2. Air resistance increases until it equals gravity, making forces balanced
    3. The skydiver runs out of momentum
    4. Friction from the parachute overcomes gravity
    Show answer

    Answer: Air resistance increases until it equals gravity, making forces balanced

    As a skydiver falls faster, air resistance grows. Terminal velocity is reached when air resistance equals gravitational force — net force is zero, so acceleration stops.

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