A 10 N horizontal force is applied to a 2 kg block that pushes a 3 kg block in contact with it on a frictionless surface. The contact force between the two blocks is:
A10 N
B2 N
C4 N
D6 N
Answer & Solution
Correct answer: D. 6 N
Both blocks accelerate together: a = 10/(2+3) = 2 m s⁻². The contact force is the net force needed to accelerate the rear 3 kg block alone = 3×2 = 6 N.
Related questions
A constant force of 6 N acts for 4 s on a 2 kg body initially at rest. The kinetic energy A stone of mass 0.5 kg is whirled in a horizontal circle of radius 1 m at constant angularA car of mass 1000 kg accelerates from rest to 20 m s⁻¹ in 5 s on a level road. The net hoA man weighing 50 kg jumps off a stationary boat of mass 250 kg into water with a horizontNewton's third law states that 'action and reaction are equal and opposite'. The most accuTwo identical billiard balls strike a smooth rigid wall with equal speeds u. Ball A strikeA force F acts on a particle making an angle θ with its instantaneous velocity. The componA cricketer draws his hands back while catching a fast ball. The physical reason is that: