P11101-E134 Lecture Exam 1a: Theory & facts part (30%) Spriag, 1018 NAM This res

Question

P11101-E134 Lecture Exam 1a: Theory & facts part (30%) Spriag, 1018 NAM This rest alilowed. Na boaks or nodes are allowed credits totaling 25 points Calculalors are A1 F 1) The first scientist to introduce the concept of inertia was A) Aristotle. Gai leo discover tt and de ,and Galileo C) Newton D) Inertia is defined as a force property of matter C) change in motion. D) none of the above 3) If no external forces act on an object that was initially moving, it wil continue moving at the same velocity. B) move slower and slower until it finally stops C) come to an abrupt halt. D) none of the ahove 4) The equilibrium rule, Fn F-sum of forcess-0, applies to A) objects or systems at rest. B) objects or systems in uniform (constant speed) motion in a straight line Oboth of these D) neither of these 5) The two measurements necessary for calculating average speed are A) acceleration and time velocity and time. )distance and time. ->D) distance and acceleration. E) velocity and distance. 6) An object undergoes acceleration (in other words, a A) gains speed. B) loses speed. C) changes its direction of motion. 0) when it all of the above -

Explanation / Answer

2) inertia is the mass of object.

Ans: (B) Propert of matter.

3) F_net = m a = 0

a = 0 then it will move with constant velocity.

Ans:(A)

4) if system is continously at rest then a = 0

if moving with constant speed in straight line(constant direction)then velocity constant.

so a = 0

F_net = m a = 0

ANs(C)

5) average speed= distance travelled / time taken

Ans(C)

6) a is nonzero means velocity changes.

velocity changes if speed changed (slow down Or speed up)

Or change in direction. (velocity is vector quantity have both magitude(speed) and direction)

Ans(D)

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