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The triangular law of vector addition and triangular law of velocities are the same.

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Important Questions on Dynamics

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If two velocity vectors a and b with equal magnitude v and angle between them is 120° then resultant is velocity is

HARD

Complete the following concept map suitably.

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Write the equation to find the resultant velocity of two velocity vectors.
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A boat moves at a speed of 20 km h-1 due south across a river which has a current which flows 10 km h-1 in the east direction. What is the resultant velocity of the boat?
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A boat moves at a speed of 10 km h-1 due south across a river which has a current which flows 5 km h-1 in the east direction. What is the resultant velocity of the boat?
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Write the motion of different parts of a bicycle while it is motion

a) the wheel

b) the cycle chain

c) the pedal with its arm

d) the movement of the feet pedaling

e) the movement of the rider along with the bicycle.

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A body moves 60° due North-East with velocity 10 km h-1 and then due East with velocity 10 km h-1. Find the resultant velocity 

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Write down the different kinds of motion and give one example for each of them.
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A body moves due East with velocity 20 km h-1 and then due North with velocity 15 km h-1. Find the resultant velocity.

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The polygon law of velocities is just an extension of parallelogram law of velocities.
MEDIUM
Explain three types of motion by giving examples.
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The SI unit of resultant velocity is m s-2.
MEDIUM

The table on oscillation prepared by Likitha, Iqbal, and Sonu given below.

                    Likitha                    Iqbal          Sonu
The motion of the membrane across the drum head of a chenda, on beating it. The motion of the membrane across the drum head of a chenda, on beating it. The motion of an arrow, shot from a bow.
The motion of a swinging cot. The motion of a string while playing a veena. The motion of the prongs of excited tuning fork.
The motion of a giant wheel. The motion of the prongs of the excited tuning fork. The motion of a stretched metal wire on strumming it.

What is the main difference between vibration and oscillation?

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Explain the relation between polygon law of velocities and triangular law of velocities.
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What are the other types of motion that take place around you? Enlist.
MEDIUM

Give one example for each of the following.

  • Rotational motion
  • Circular motion
  • Compound motion.
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The resultant vector is at angle of 32° with respect to P if the vectors P=20 units, Q=30 units with an angle of 45°.