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2014 WAEC Physics Theory (a) Give two examples each of: (i) rotational motion; (ii) linear motion. (b) Describe a...

Physics
WAEC 2014

(a) Give two examples each of:

(i) rotational motion;

(ii) linear motion.

(b) Describe a laboratory experiment to determine the density of an irregularly shaped solid.

(c) State Newton's second law of motion

(d) Explain the term inertia.

(e)

The diagram above illustrates a body of mass 5.0 kg being pulled by a horizontal force F. If the body accelerates at 2.0 ms\(^{-2}\) and experiences a frictional force of 5 N, calculate the:

(i) net force on it;

(ii) magnitude of F;

(iii) coefficient of kinetic friction. [ g = 10 ms\(^{-2}\)]

 

 

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Explanation

(a)(i) Rotational Motion; Examples:

(1) Motion of a wind mill.

(2) Motion of a turntable or disc.

(3) Rotation of the earth about its axis.

(4) Movement of the blade of an electric fan, etc.

 

(ii) Linear Motion; Examples are:

(1) An athlete running on a straight track.

(2) A car moving on a straight road.

(3)A ball rolling on a level ground, etc.

 

(b) In the laboratory, the mass(m) of an irregular shaped solid can be determined using a chemical or beam balance using a graduated measuring cylinder fill it partially with water and the initial volume V\(_2\) recorded, then completely immersed the irregular solid shape in the water and the final volume V recorded. Volume of the solid = V\(_2\) - V\(_{1}\)

But density =  \(\frac{Mass}{ Volume}\)

= \(\frac{M}{V_2 - V_1}\)

(c) Newton's second law of motion states that the time rate of change of momentum of a body is directly propotional to the applied force acting on it and takes place in the direction of the force.

(d) Inertia is the reluctance of a body to move if it is at rest or to stop if it is already in motion. The more the mass of a body, the greater is its inertia.

(e)(i) Net force = F - F\(_1\) = Ma

5.0 x 2.0 = 10N

(ii) F = Ma + F\(_1\) = 10 + 5 = 15.0N

(iii) µ = \(\frac{F}{R} = \frac{F}{mg} = \frac{15}{5 \times 10}\) 

= 0.3


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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789