1. i). Mechanical energy is the sum of potential energy andkinetic energy in an object that is used to do work.

ii). The principle of the conservation of mechanical energystates that the mechanical energy in a system remains constant aslong as the only forces acting are conservative.

iii). Frictional force is a non-conservative force.

Which of the following statement below is false?

a) For the motion of a cart on a frictionless incline plane, themagnitude of the change in kinetic energy equals the magnitude ofthe change in gravitational potential energy

b) For the motion of a cart on an incline plane having acoefficient of kinetic friction of 0.5, the magnitude of the changein kinetic energy equals the magnitude of the change ingravitational potential energy

c) Assuming a constant gravitational potential energy for acart, the work-done by a net force on the cart equals the change inits kinetic energy

d) In an ideal free fall, the magnitude of the change ingravitational potential energy equals the magnitude of the changein gravitational potential energy

2. In the motion of an object on an inclined plane, the initialposition of the object has a height yi and the final position ofthe cart has a height yf. The initial velocity of the object is viand the final velocity is vf. Assuming no friction, which of thestatement or relation below is false?

a) vf = 0 if and only if vi = 0

b) The mechanical energy at t=0 (initial) is 1/2mvi2 + mgyi

c) If vf = 0, then mgyf = 1/2mvi2 + mgyi

d) 1/2 mvi2 – LaTeX: frac{1}{2} 1 2 mvf2 = mgyf – mgyi 3.

3. How much work is required to stop a 1500 kg car moving at aspeed of 20 m/s?

a) -25,000 J

b) Infinite

c) -600, 000 J

d) None listed

e) -300,000 J

4. Based on details in the lab manual regarding procedures forthe lab, the part II: Work-Kinetic Energy Theorem. Page 73.

Which of the statement is false?

a) The unit of work is Joules (j). If we use SI base unit, thenthe unit of work is Kg.m2s-2

b) The workdone by external net force can be represented by thearea under the speed/displacement curve

c) We will zero the force sensor on the cart before hooking onany string

d) The workdone by external net force can be represented by thearea under force/displacement