Dynamics and Forces Quiz

What happens now if the object is not in dynamic equilibrium?

• Velocity is not constant

• Acceleration greater than zero

• Since acceleration is > zero, the net Force Fnet is unbalanced

What does the relationship/equation tell us?

If mass is constant and acceleration is halved, what is the effect to force F?

If the mass remains constant and the force is doubled, how is acceleration affected?

If the force is decreased by four times and m is halved, the effect on acceleration a is?

What is the coefficient of static friction?

• μs = coefficient of static friction (object at rest)

• μk = coefficient of kinetic friction (object moving)

What are the advantages of friction?

• Walking, biking, and other modes of transportation are impossible without friction

• Writing on the board/paper will be harder without friction

• Generating heat and lighting up fire

• If friction is absent in the atmosphere, asteroids will not break into smaller bits and may potentially damage the Earth and its inhabitants.

What are the disadvantages of friction?

• Energy is wasted as a certain amount of energy is converted to heat energy, thus reducing the efficiency of the appliance or machine

• Road accidents will be frequent if friction is lesser than required

• Holding a thing in your hands is hard if friction is absent

• Increased wear and tear on machine parts if friction is frequently increased

• Wearing out of shoe soles and car tires