#### Laws of Motion Five Marks Questions

11th Standard

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Physics

Time : 00:45:00 Hrs
Total Marks : 30
10 x 3 = 30
1. What are inertial frames?

2. Under what condition will a car skid on a leveled circular road?

3. Apply Newton's second law for an object at rest on Earth and analyse the result.

4. A force of 10 N changes velocity of a body from 20 ms-1 to 40 ms-1 in 8 seconds. How much force is required to bring about the same change in 4s.

5. A lift is moving down with an acceleration 5.0 ms-2. Calculate the percentage change in the weight of a person in the lift

6. A body of 3.5 kg in acted upon by two forces of magnitudes 3N and 5N making an angle of 90° with each other. Calculate the magnitude if net acceleration experience by the body is?

7. What are the steps which have to be followed before applying Newton's laws?

8. The Two masses m1=m2 =0.5kg are connected by a string which passes over a smooth frictionless pulley. What is the, acceleration of the masses

9. A car of mass 1000 kg moving with a speed of 10 kmh-1 comes to rest in 0.01s. Find the impulse.

10. A 40 gm of bullet moving at 250 ms-1 stops after penetrating 20 cm of wood. Calculate the average force exerted by the bullet.