physic year 11

What is the definition of equilibrium of forces?

• Equilibrium of forces is when an object is in motion.

• Equilibrium of forces occurs when the net force is at its maximum.

• Equilibrium of forces means all forces are acting in the same direction.

• Equilibrium of forces is the state where the sum of all forces acting on an object is zero.

List the conditions necessary for an object to be in equilibrium.

• The object must have a net force acting on it.

• The net force and net torque acting on the object must both be zero.

• The object must be at a specific temperature.

• The object must be in motion.

What are the two main types of equilibrium?

• Thermal equilibrium and mechanical equilibrium

• Static equilibrium and dynamic equilibrium

• Static balance and kinetic balance

• Equilibrium and instability

Explain the difference between stable and unstable equilibrium.

• Stable equilibrium returns to the original position; unstable equilibrium moves away from it.

• Stable equilibrium is a type of unstable equilibrium.

• Unstable equilibrium always returns to the original position.

• Stable equilibrium is always unstable.

Define the moment of a force and its formula.

• Moment of a force = Force / Distance (M = F / d)

• Moment of a force (Torque) = Force × Distance from pivot (M = F × d)

• Moment of a force = Mass × Acceleration (M = m × a)

• Moment of a force = Force + Distance (M = F + d)

How does the principle of moments apply to equilibrium?

• The principle of moments applies only to static objects and not to dynamic systems.

• Equilibrium is achieved when the total weight of an object is zero, regardless of moments.

• The principle of moments states that only clockwise moments are considered for equilibrium.

• The principle of moments ensures that the sum of clockwise moments equals the sum of counterclockwise moments for equilibrium.

What is simple harmonic motion (SHM)?

• Motion that occurs in a straight line only

• A type of motion with no restoring force

• Any motion that is not periodic

• Simple harmonic motion (SHM) is periodic motion where the restoring force is proportional to the displacement from equilibrium.

Identify the characteristics of simple harmonic motion.

• Characteristics of simple harmonic motion include periodicity, a restoring force proportional to displacement, sinusoidal motion, constant frequency, and energy conservation.

• Restoring force inversely proportional to displacement

• Non-periodic motion

• Motion with constant acceleration

What is the relationship between displacement and acceleration in SHM?

• Acceleration is constant regardless of displacement in SHM.

• Acceleration is inversely proportional to displacement in SHM.

• Acceleration is directly proportional to displacement and directed towards the equilibrium position in SHM.

• Displacement has no effect on acceleration in SHM.

Write the equation for the displacement of an object in SHM.

• x(t) = A e^(ωt)

• x(t) = A cos(ωt + φ)

• x(t) = A tan(ωt + φ)

• x(t) = A sin(ωt + φ)