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

A \(5\,\mathrm{kg}\) mass is in a \(10\,\mathrm{N/kg}\) field. What is its weight?
  1. \(50\,\mathrm{N}\)
  2. \(0.5\,\mathrm{N}\)
  3. \(15\,\mathrm{N}\)
  4. \(500\,\mathrm{N}\)

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. Newton's first law
  3. Newton's third law
  4. Hooke'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

Which force opposes motion between surfaces?
  1. Friction
  2. Drag
  3. Upthrust
  4. Tension

Question 6

Area doubles while force stays constant. What happens to pressure?
  1. It halves
  2. It doubles
  3. It stays unchanged
  4. It quadruples

Question 7

What is true when forces are balanced?
  1. Resultant force is zero
  2. Velocity is zero
  3. Acceleration is non-zero
  4. Momentum is zero

Question 8

Which way does gravity accelerate an orbiting satellite?
  1. Towards the orbit's centre
  2. Along its tangent
  3. Away from its centre
  4. Opposite its motion

Question 9

A \(50\,\mathrm{N}\) force acts for \(0.2\,\mathrm{s}\). What impulse is delivered?
  1. \(10\,\mathrm{N\,s}\)
  2. \(250\,\mathrm{N\,s}\)
  3. \(50.2\,\mathrm{N\,s}\)
  4. \(0.004\,\mathrm{N\,s}\)

Question 10

At terminal velocity, how do weight and air resistance compare?
  1. They are equal
  2. Weight is greater
  3. Air resistance is greater
  4. Both are zero

Question 11

Forces of \(50\,\mathrm{N}\) right and \(10\,\mathrm{N}\) left act on an object. What is the resultant?
  1. \(40\,\mathrm{N}\) right
  2. \(60\,\mathrm{N}\) right
  3. \(40\,\mathrm{N}\) left
  4. \(5\,\mathrm{N}\) right

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

Question 14

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

Question 15

Why does greater mass increase braking distance at the same speed?
  1. More kinetic energy must be transferred
  2. The brakes exert less friction
  3. The driver's reaction time increases
  4. The road provides less grip

Question 16

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

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 does opening a parachute reduce downward acceleration?
  1. Air resistance increases
  2. Upthrust increases
  3. Weight decreases
  4. Momentum becomes zero

Question 19

Which is a Newton's third-law pair?
  1. Swimmer pushes water; water pushes swimmer
  2. Earth pulls ball; ball accelerates
  3. Table pushes book; Earth pulls book
  4. Magnet pulls iron; friction opposes motion

Question 20

What does the area under a force-extension graph give?
  1. Work done
  2. Spring constant
  3. Extension
  4. Limit of proportionality

Question 21

Acceleration is the rate of change of what?
  1. Velocity
  2. Distance
  3. Displacement
  4. Momentum

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

How does a stretching seatbelt reduce crash force?
  1. It increases stopping time
  2. It decreases stopping distance
  3. It reduces initial momentum
  4. It increases collision speed

Question 24

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

Question 25

Which change increases a driver's thinking distance?
  1. Higher speed
  2. Worn tyres
  3. Weaker brakes
  4. A wet road

Question 26

A \(20\,\mathrm{N}\) force acts \(0.5\,\mathrm{m}\) from a pivot. What moment does it produce?
  1. \(10\,\mathrm{N\,m}\)
  2. \(40\,\mathrm{N\,m}\)
  3. \(20.5\,\mathrm{N\,m}\)
  4. \(0.025\,\mathrm{N\,m}\)

Question 27

What is the unit of momentum?
  1. \(\mathrm{kg\,m\,s^{-1}}\)
  2. \(\mathrm{N\,kg^{-1}}\)
  3. \(\mathrm{J\,s^{-1}}\)
  4. \(\mathrm{kg\,m^{-3}}\)

Question 28

The same energy is transferred over twice the braking distance. What happens to average force?
  1. It halves
  2. It doubles
  3. It stays unchanged
  4. It quadruples

Question 29

Which equation gives elastic potential energy in a spring?
  1. \(E_e=\frac{1}{2}ke^2\)
  2. \(E_e=ke\)
  3. \(E_e=mgh\)
  4. \(E_e=\frac{1}{2}mv^2\)

Question 30

What is the condition for an object in equilibrium?
  1. Resultant force and resultant moment are both zero
  2. Resultant force is zero but moment is non-zero
  3. Resultant moment is zero but force is non-zero
  4. The object must be stationary

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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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