Physics Concepts Assessment

What is Hooke's Law and how is it applied in real life?

• Hooke's Law states that energy is conserved in all systems.

• Hooke's Law describes the motion of planets in space.

• Hooke's Law is only applicable to electrical circuits.

• Hooke's Law describes the relationship between force and displacement in springs, applied in devices like springs, shock absorbers, and scales.

Calculate the Young's Modulus for a material that stretches 2 mm under a load of 100 N if its original length is 1 m and its cross-sectional area is 0.01 m².

• 1000000 Pa

• 5000000 Pa

• 7500000 Pa

• 2000000 Pa

Provide an example of Archimedes' Principle in action.

• A balloon filled with air sinks in water.

• A boat floating on water displaces a volume of water equal to its weight.

• A rock sinking in water displaces no water.

• A fish swimming in the air displaces water.

Explain the conditions for equilibrium in a system of forces.

• The sum of forces must be equal to the sum of moments.

• Only the vertical forces need to be balanced.

• The system must be in motion for equilibrium to occur.

• The vector sum of forces must be zero and the sum of moments must be zero.

What is a couple in physics and how does it relate to torque?

• A couple consists of three forces that do not create torque.

• A couple in physics is two equal and opposite forces that create torque, which is the rotational effect produced by these forces.

• A couple is the distance between two points in a system.

• A couple is a single force acting on an object.

If a spring stretches 5 cm when a force of 20 N is applied, what is the spring constant?

• 50 N/m

• 200 N/m

• 400 N/m

• 100 N/m

How do you determine the Young's Modulus from a stress-strain graph?

• Young's Modulus is calculated by the area under the stress-strain curve.

• Young's Modulus is the maximum stress value on the graph.

• Young's Modulus is determined by the total strain at failure.

• Young's Modulus is determined by the slope of the linear region of the stress-strain graph.

Describe a scenario where Archimedes' Principle can be used to determine the density of an object.

• Density = Volume / Mass, where Mass is the weight of the object.

• Density cannot be determined using Archimedes' Principle.

• Density = Mass + Volume, where Volume is the weight of the object.

• Density = Mass / Volume, where Volume is the water displaced by the object.

What are the two types of equilibrium and how do they differ?

• Static balance and dynamic balance

• Static equilibrium and kinetic equilibrium

• Static equilibrium and dynamic equilibrium

• Static stability and dynamic stability

Calculate the torque produced by a force of 15 N applied 0.5 m from the pivot point.

• 10 N·m

• 5 N·m

• 12 N·m

• 7.5 N·m