Physics 9 Chapter 3 - Dynamics - 3

Physics 9 Chapter 3 - Dynamics - 3

1. The force which is resultant of all the forces acting on it is called?

a) Newton force
b) Negative force
c) Nill force
d) Net Force

2. If there is no force to oppose the motion of a body then the moving body would?

a) Will stop its self
b) Never stop

c) Gain speed

d) Become slow

3. ‘A body continues its state of rest or of uniform motion in a straight line provided no net force acts on it’, this is Newton’s ?

a) Second law

b) Third law

c) Fourth law
d) First law

4. The Newton’s first law of motion deals with which property of matter?

a) Inertial

b) Potential

c) Kinetic

d) Momentum

5. We have observed that the passenger standing in a bus fall forward when the driver applies brakes suddenly , this is due to ?

a) Inertia

b) Potential

c) Kinetic energy
d) Momentum

6. When the net force is acting on a body than which law of Newton deals with the situation?

a) Third law
b) First law

c) All laws

d) Second law

7. In second law of motion the magnitude of body acceleration is directly propotional to?

a) Magnitude of a body

b) Mass of a body
c) Inertia of a body
d) Net force acting on body

8. In second law of motion the magnitude of body acceleration is inversely propotional to?

a) Magnitude of a body

b) Inertia of a body
c) Mass of a body

d) Net Force acting on a body

9. In Newton’s second law the acceleration is directly propotion to?

a) Mass

b) Force

c) Magnitude

d) Inertia

10. From newton’s second law we can say that the force is equal to?

a) F=ms
b) F=mv

c) F=ma

d) F=mu

11. The SI unit of force is ?

a) ms
b) m/s

c) newton(N)

d) N/s

12. According to which law of motion; the one Newton(1N) is the force that produces an acceleration of 1m/s in a body of mass of 1 kg?

a) Second law
b) All laws
c) First law
d) Third law

13. What will be the acceleration tht produced by a 20 N force in a mass of 8kg?

a) 2.5ms
b) 2.0ms-2
c) 2.5ms-2
d) 2.0m/s

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