Forces questions

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Forces question collection

Review Forces questions for Physics, with correct answers shown and coverage across resultant forces; weight and mass; work done and springs.

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Question 1

Which equation defines weight?
  1. \(W = mg\)
  2. \(W = m / g\)
  3. \(W = m + g\)
  4. \(W = mg^2\)

Question 2

A \(10\,\mathrm{kg}\) object experiences a \(20\,\mathrm{N}\) resultant force. What is its acceleration?
  1. \(2\,\mathrm{m/s^2}\)
  2. \(0.5\,\mathrm{m/s^2}\)
  3. \(200\,\mathrm{m/s^2}\)
  4. \(10\,\mathrm{m/s^2}\)

Question 3

Which law links resultant force, mass and acceleration?
  1. Newton’s second law
  2. Hooke’s law
  3. Boyle’s law
  4. Snell’s law

Question 4

Momentum is calculated with which equation?
  1. \(p = mv\)
  2. \(p = m / v\)
  3. \(p = mv^2\)
  4. \(p = m + v\)

Question 5

What opposes motion between surfaces?
  1. Friction
  2. Gravity
  3. Speed
  4. Pressure

Question 6

If area doubles while force stays constant, what happens to the pressure?
  1. Halves the pressure
  2. Doubles the pressure
  3. Has no effect
  4. Triples the pressure

Question 7

Which statement best describes balanced forces?
  1. Resultant force is zero and motion does not change
  2. They always produce acceleration
  3. They only act in fluids
  4. They never coexist with friction

Question 8

Which force provides the centripetal pull keeping a satellite in orbit?
  1. Gravity
  2. Friction
  3. Thrust
  4. Magnetic attraction

Question 9

If a car brakes, the decrease in momentum is linked to stopping force and time by which concept?
  1. Impulse FΔt
  2. Elastic potential energy
  3. Power
  4. Pressure

Question 10

When an object falls, why does it eventually reach terminal velocity?
  1. Air resistance equals weight, so resultant force zero
  2. Gravity stops acting
  3. Mass decreases
  4. Speed becomes constant because of temperature

Question 11

A \(50\,\mathrm{N}\) force pushes a \(5\,\mathrm{kg}\) mass. What is the acceleration if there is also \(10\,\mathrm{N}\) friction opposing motion?
  1. \(8\,\mathrm{m/s^2}\)
  2. \(10\,\mathrm{m/s^2}\)
  3. \(5\,\mathrm{m/s^2}\)
  4. \(0\,\mathrm{m/s^2}\)

Question 12

Which equation links work done, force and distance for a constant force?
  1. \(W = Fd\)
  2. \(W = F / d\)
  3. \(W = F + d\)
  4. \(W = Fd^2\)

Question 13

If the velocity of an object increases in the same direction as the force, what is the force doing?
  1. Doing positive work
  2. Doing negative work
  3. Not doing work
  4. Acting perpendicular only

Question 14

Which quantity is scalar rather than vector?
  1. Speed
  2. Force
  3. Velocity
  4. Acceleration

Question 15

Why does mass affect the stopping distance when braking?
  1. More mass means more momentum to remove
  2. It changes the type of force
  3. Heavier objects always stop instantly
  4. Mass changes the braking friction only

Question 16

Which quantity is conserved in collisions if no external force acts?
  1. Momentum
  2. Speed
  3. Displacement
  4. Energy only

Question 17

Which equation links pressure P, force F and area A?
  1. \(P = F / A\)
  2. \(P = FA\)
  3. \(P = A / F\)
  4. \(P = F + A\)

Question 18

Why do parachutes create less acceleration when deployed?
  1. They increase air resistance and reduce resultant force
  2. They decrease gravity
  3. They add mass
  4. They turn off the engine

Question 19

Which pair best illustrates action and reaction forces?
  1. A swimmer pushes water backwards and water pushes swimmer forwards
  2. A magnet attracts iron at rest
  3. An object weighing on a table
  4. A car and its shadow

Question 20

Why is a strong nuclear force needed inside a nucleus?
  1. To overcome the electrostatic repulsion between protons
  2. To push electrons away
  3. To create gravitational attraction
  4. To produce magnetic fields

Question 21

Which vector represents acceleration?
  1. Change in velocity per unit time
  2. Velocity only
  3. Mass times time
  4. Distance moved

Question 22

Which Newton law says every action has an equal and opposite reaction?
  1. Third law
  2. First law
  3. Second law
  4. Power law

Question 23

Why does a seatbelt stretch during a crash?
  1. It increases the stopping time to reduce force
  2. It provides no protection
  3. It stores electricity
  4. It creates momentum

Question 24

Which unit gives pressure?
  1. Newton per square metre
  2. Watt
  3. Joule
  4. Second

Question 25

Why does a car's braking distance increase with mass?
  1. More mass means more momentum to remove
  2. Mass reduces friction
  3. Mass lowers gravity
  4. Mass changes the braking friction only

Question 26

A \(1500\,\mathrm{kg}\) car speeds up from \(12\,\mathrm{m/s}\) to \(20\,\mathrm{m/s}\) in \(4\,\mathrm{s}\). What is the resultant force?
  1. \(3000\,\mathrm{N}\)
  2. \(1200\,\mathrm{N}\)
  3. \(6000\,\mathrm{N}\)
  4. \(2000\,\mathrm{N}\)

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Review Forces questions for Physics, with correct answers shown and coverage across resultant forces; weight and mass; work done and springs.

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