Review of Mechanical Energy and Momentum Equations and When To Use Them!

The video tutorial reviews momentum and mechanical energy equations, emphasizing when to use each. It highlights the importance of identifying initial and final points in mechanical energy equations and clarifies common misconceptions about momentum and impulse. The tutorial also distinguishes between conservation of energy and momentum, explaining the conditions under which each holds true.

Under what condition can the conservation of mechanical energy be applied?

• When the work done by friction is zero

• When the work done by friction is not zero

• When the work done by gravity is zero

• When the work done by any force is zero

Which equation is always true regardless of the forces involved?

• Conservation of momentum

• Impulse equals impact force

• Net work equals change in kinetic energy

• Work done by friction equals change in kinetic energy

What must be identified before using mechanical energy equations?

• The velocity of the objects

• The mass of the objects

• The initial and final points, and the horizontal zero line

• The type of forces involved

When is conservation of momentum applicable?

• When all forces are external

• During all collisions and explosions

• When the initial and final points are identified

• When the work done by friction is zero

What is a common misconception about impulse and impact force?

• They are the same because they start with the same letter

• Impulse is always greater than impact force

• Impact force is always greater than impulse

• They are unrelated concepts