Friction and Spring Force Concepts

The video tutorial explains Newton's laws and friction using a mass-spring system. It describes the setup, identifies forces acting on the mass, and explains static friction. The tutorial calculates the maximum friction force and determines the maximum extension before the mass starts sliding. Examples illustrate force calculations, emphasizing the reactionary nature of friction.

What is the spring constant of the spring attached to the mass?

• 800 N/m

• 600 N/m

• 400 N/m

• 1000 N/m

What is the coefficient of static friction between the mass and the surface?

• 0.3

• 0.9

• 0.5

• 0.7

Which force acts to prevent the mass from accelerating to the left?

• Tension force

• Normal force

• Frictional force

• Gravitational force

What condition must be met for the mass to remain stationary?

• Spring force must be greater than frictional force

• Spring force must be less than or equal to frictional force

• Normal force must be less than frictional force

• Gravitational force must be greater than normal force

What is the maximum frictional force that can act on the mass?

• 108 N

• 88 N

• 78 N

• 98 N

How far can the mass be pulled before it starts sliding back?

• 10.25 cm

• 11.25 cm

• 12.25 cm

• 13.25 cm

If the mass is pulled 5 cm, what is the force exerted by the spring?

• 20 N

• 30 N

• 40 N

• 50 N

At what spring force will the mass begin to slide?

• 98 N

• 88 N

• 118 N

• 108 N

What happens to the frictional force as the spring force increases?

• It remains constant

• It decreases

• It increases and matches the spring force

• It becomes zero

What is the reactionary nature of the frictional force?

• It acts independently of the applied force

• It always exceeds the applied force

• It matches the applied force until a maximum limit

• It is unaffected by the spring force