Friction is the result of
gravitational acceleration
molecular interaction
magnetic interaction
nuclear interaction
A person swimming in a fresh water pool obeys
Newton's second law
Gravitational law
Newton's third law
Newton's first law
A body is at rest on the surface of the earth. Which of the following statement is correct?
No free is acting on the body
Only weight of the body acts on it.
Net downward force is equal to the net upward force.
None of the above statement is correct
An army vehicle of mass 1000 kg is moving with a velocity of 10 m/s and is acted upon by a forward force of 1000 N due to engine and a retarding force of 500 N due to friction.What will be its velocity after 10 sec ?
5 m/s
10 m/s
15 m/s
20 m/s
A body of mass 2 kg ,moving on a horizontal surface with an initial velocity of 4 m/s , comes to rest after 2 s.If one wants to keep this moving on the same surface with a velocity of 4 m/s,the force required is
2 N
4 N
6 N
10 N
A block of mass 10 kg is placed on a rough horizontal surface whose coeffecient of friction is 0.5.If a horizontal force of 100 N is applied on it,then acceleration of block will be :
10 m/s2
5 m/s2
15 m/s2
0.5 m/s2
A force of 100 N need to be applied parallel to a smooth inclined plane just to hold a body on it. The angle of inclination of the inclined plane is 300. How much horizontal force need to be applied to do the same?
50 N
87 N
100 N
115 N
A certain force applied to a mass m1 gives it an acceleration of 15 m/s2 .The same force applied to a mass m2 gives it an accelerationof 10 m/sec2 .If the two masses are fixed together and the same force is applied to the combination ,find the acceleration.
6 ms-2
0.6 ms-2
4 ms-2
none of these
A body of mass 0.1 kg attains a velocity of 10 m/s in 0.1s.The force acting on them is:
0.001 N
0.01 N
1000 N
An air craft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15° .What is the radius of the loop?
13 x 103 m
15.2 x 103 m
13.6 x 103 m
None of these
