Forces & Motion Quiz

1. Newton's First Law of Motion states that:

1. An object remains at rest or in uniform motion unless acted upon by a net external force
2. Every action has an equal and opposite reaction
3. Force = mass × acceleration
4. Objects fall at the same rate regardless of mass

2. Newton's Second Law states F = ma. What does each letter represent?

1. Force, mass, acceleration
2. Force, momentum, area
3. Frequency, mass, amplitude
4. Friction, momentum, acceleration

3. Newton's Third Law states:

1. Acceleration is proportional to force
2. Every action has an equal and opposite reaction
3. Objects fall at the same rate
4. Velocity increases proportionally with time

4. What is the unit of force in the SI system?

1. Joule
2. Newton
3. Pascal
4. Watt

5. What is 'inertia'?

1. The acceleration of a falling object
2. The force of gravity on an object
3. The friction between two surfaces
4. The tendency of an object to resist changes in its state of motion

6. What is the difference between speed and velocity?

1. Speed is faster; velocity is slower
2. Speed is how fast (scalar); velocity includes direction (vector)
3. They are the same thing
4. Velocity uses km/h; speed uses m/s

7. What is 'momentum'?

1. Energy of motion
2. Force × time
3. Mass × acceleration
4. Mass × velocity

8. What is friction?

1. A force that opposes relative motion between surfaces in contact
2. The force that keeps planets in orbit
3. The force that makes magnets attract
4. The force that pulls objects toward Earth

9. What is the acceleration due to gravity on Earth's surface?

1. 10.2 m/s²
2. 11.0 m/s²
3. 8.9 m/s²
4. 9.8 m/s²

10. What happens to an object in free fall (ignoring air resistance)?

1. Heavier objects fall faster
2. It accelerates at 9.8 m/s² regardless of mass
3. It decelerates as it falls
4. It falls at constant speed

11. What is 'terminal velocity'?

1. The constant speed reached when air resistance equals the force of gravity
2. The final speed of a rocket
3. The maximum speed of light
4. The speed at which an object stops accelerating due to engine limits

12. What is the difference between mass and weight?

1. Mass is measured in Newtons; weight in kilograms
2. Mass is the amount of matter (kg); weight is the force of gravity acting on that mass (N)
3. They are the same thing
4. Weight is constant; mass changes with location

13. What is 'work' in the physics sense?

1. Any physical effort
2. Energy stored in an object
3. Force × distance (in the direction of force)
4. Mass × velocity

14. What is the unit of energy?

1. Joule
2. Newton
3. Pascal
4. Watt

15. What is 'potential energy'?

1. Energy of motion
2. Energy released by burning fuel
3. Energy stored in an object due to its position or state
4. The energy equivalent of mass

16. What is the Law of Conservation of Energy?

1. Energy always increases in a closed system
2. Energy can be created from nothing
3. Energy can be destroyed but not created
4. Energy cannot be created or destroyed — only converted between forms

17. A car accelerates from 0 to 30 m/s in 10 seconds. What is its acceleration?

1. 10 m/s²
2. 3 m/s²
3. 30 m/s²
4. 300 m/s²

18. What force keeps planets in orbit around the Sun?

1. Electromagnetic force
2. Gravitational force
3. Magnetic force
4. Nuclear force

19. What is 'elastic potential energy'?

1. Energy in elastic bands only
2. Energy stored in a stretched or compressed elastic material
3. Energy that can stretch to fill a container
4. Kinetic energy of an elastic collision

20. What is 'centripetal force'?

1. A force that pushes objects outward in a circle
2. Gravity at the centre of the Earth
3. The force that acts outward on a spinning object
4. The inward force required to keep an object moving in a circular path