Question

Two Mark Questions

1.  Define the term displacement. Is it a vector quantity or a scalar quantity?

2.  What is circular motion? Is circular motion an acceleration motion?

3.  Derive mathematically the first equation of motion V=u + at?

Three Mark Questions

4.  A boy runs for 20 min. at a uniform speed of 18km/h. At what speed should he run for the next 40 min. so that the average speed comes 24km/hr.

5.  A train accelerated from 10km/hr to 40km/hr in 2 minutes. How much distance does it cover in this period? Assume that the tracks are straight?

6.  A train starts from rest and accelerate uniformly at the rate of 5 m/s2 for 5 sec. Calculate the velocity of train in 5 sec.

7.  A bullet leaves a rifle with a muzzle velocity of 1042 m/s. While accelerating through the barrel of the rifle, the bullet moves a distance of 1.680 m. Determine the acceleration of the bullet (assume a uniform acceleration)

8.  A bike riding at 22.4 m/s skids to come to a halt in 2.55 s. Conclude the skidding distance of the bike.

9.  A race scooter is seen accelerating uniformly from 18.5 m/s to 46.1 m/s in 2.47 seconds. Determine the acceleration of the scooter and the distance travelled.

10.  A car is travelling with a speed of 36 km/h. The driver applied the brakes and retards the car uniformly. The car is stopped in 5 sec. Find (i) The acceleration of car and (ii) Distance before it stops after Appling breaks?

11.  Can displacement be zero? If yes, give two examples of such situations.

Five Mark Questions

12.  Prove that S=ut+1/2at2 graphically.

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Answer 1

Answer:

1.displacement is the difference between initial position to the final postion. it is the vector quantity not the scalar quantity.

2.circular motion is a movement of a object along thr circumference of a circle or rotation along a circular path.since the object velocity vector is a constantly changing direction the moving object is undergoing acceleration by a centripetal force in the direction of the centre of rotation.

Answer 2

Explanation:

3). V= u+at

This equation is comes from acceleration.

Acceleration= change in velocity/ time

a= v-u/t

a×t = v-u

v-u = a×t

v= a×t +u

v= u+at