Physics
Force and Motion
Page 6 of 11
#41 When two bodies collide elastically they interchange their velocity when their
A) Masses are equal
B) Velocity are equal
C) Accelerations are equal
D) None
#42 A person travels a distance x=30t+4AT2 where A is constant. The acceleration of a person is
A) 8Am/s2
B) A/8m/s2
C) A/4m/s2
D) 8m/s2
#43 When a force of 4N acts on a body of mass 2kg for 2 second) The rate of change of momentum is SL units:
A) 1
B) 2
C) +
D) 2
#44 Lift coefficient increases with
A) small angle of attack
B) zero velocity
C) density decrease
D) stall beyond critical angle
#45 For creeping flow, drag varies as
A) v^2
B) v
C) vv
D) 1/v
#46 Continuity for branching pipe Qin=Q1+Q2 expresses
A) momentum balance
B) mass conservation
C) energy loss
D) pressure rise
#47 Hydraulic machines use fluid dynamics primarily to
A) store potential energy only
B) convert energy forms
C) measure temperature
D) create mass
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