Structure test n°3

What is the equation for Hooke's Law?

• F = ma

• F = kx

• F = -kx

• F = -ma

Hooke's Law states that the force exerted by a spring is directly proportional to what?

• The displacement of the spring from its rest position

• The mass of the object attached to the spring

• The velocity of the object attached to the spring

• The acceleration of the object attached to the spring

An object with a mass of 5 kg is attached to a spring with a spring constant of 100 N/m. How much force is exerted on the object when it is displaced by 0.1 m from its rest position?

• 0.5 N

• 5 N

• 50 N

• 500 N

Hooke's law is only valid for small displacement.

• True

• False

A spring with a spring constant of 50 N/m is stretched 0.2 m from its rest position. How much work is done to stretch the spring?

• 5 J

• 10 J

• 20 J

• 100 J

What is the difference between elastic and plastic deformation?

• Elastic deformation is permanent, while plastic deformation is temporary

• Elastic deformation is reversible, while plastic deformation is irreversible

• Elastic deformation is irreversible, while plastic deformation is reversible

• Elastic deformation is temporary, while plastic deformation is permanent

What is the yield strength of a material?

• The maximum strain a material can undergo before breaking

• The amount of deformation a material can undergo before breaking

• The minimum stress a material can withstand without permanent deformation

• The maximum stress a material can withstand without permanent deformation

What is the modulus of elasticity?

• The ratio of stress to strain in a material

• The ratio of strain to stress in a material

• The ratio of force to area in a material

• The ratio of area to force in a material

How does temperature affect the modulus of elasticity?

• It increases as temperature increases

• It remains constant with changes in temperature

• It decreases as temperature increases

• It is inversely proportional to temperature

How does the modulus of elasticity relate to a material's stiffness?

• The modulus of elasticity is equal to the stiffness

• There is no correlation between modulus of elasticity and stiffness

• The lower the modulus of elasticity, the stiffer the material

• The higher the modulus of elasticity, the stiffer the material