Forces and Structures

What are the four subtopics related to forces?

• Newton's Laws of Motion, Friction, Gravity, Elasticity

• Reflection, Refraction, Diffraction, Interference

• Temperature, Pressure, Volume, Density

• Magnetism, Inertia, Velocity, Acceleration

Which force is responsible for stretching or pulling an object?

• compression

• friction

• tension

• gravity

Which force is responsible for squeezing or pushing an object?

• tension force

• friction force

• compression force

• gravitational force

Which force acts parallel to the surface of an object?

• gravity

• tension

• normal force

• friction

Which force causes an object to bend or flex?

• stretching force

• bending force

• compressing force

• twisting force

What are the effects of forces on objects?

• Forces can cause objects to move, change direction, accelerate, decelerate, or deform.

• Forces can make objects disappear

• Forces can only change the color of objects

• Forces have no effect on objects

How do you calculate the force acting on an object?

• F = m / a

• F = m + a

• F = m * a

• F = m^a

What is the condition for equilibrium of forces?

• The vector sum of all the forces acting on an object must be zero.

• The condition for equilibrium of forces is that the net force acting on an object must be equal to its acceleration.

• The vector sum of all the forces acting on an object must be non-zero.

• The condition for equilibrium of forces is that the net force acting on an object must be equal to its mass.

Give an example of an application of forces in everyday life.

• Turning on a light switch

• Lifting a heavy object

• Pulling a door

• Pushing a door

What are the different types of forces acting in structures?

• pressure, temperature, velocity, acceleration, and density

• gravity, friction, magnetism, electricity, and heat

• compression, tension, shear, bending, and torsion

• attraction, repulsion, expansion, contraction, and vibration