Home
Class 12
PHYSICS
A 20 N block is being pushed across a ho...

A 20 N block is being pushed across a horizontal table by an 18 N force. If the coefficient of kinetic friction between the block and the table is 0.4, find the acceleration of the block.

A

`0.5 m//s^(2)`

B

`1 m//s^(2)`

C

`5 m//s^(2)`

D

`7.5 m//s^(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
The net force on the block is `F-F_(f)=F-mu_(k)F_(N)=F-mu_(k)F_(w)=(18 N)-(0.4)(20 N)=10 N`. Since `F_("net")=ma=((F_(w))/(g))a`, we find that `10 N=[(20N)/(10 m//s^(2))]a`, which gives ` a= 5m//s^(2)`.
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

A block of mass 1 kg lies on a horizontal surface in a truck. The coefficient of static friction between the block and the surface is 0.6. If the acceleration of the truck is 5m//s^2 , the frictional force acting on the block is…………newtons.

A block of mass 1 kg lies on a horizontal surface in a truck. The coefficient of static friction between the block and the surface is 0.6. If the acceleration of the truck is 5m//s^2 , the frictional force acting on the block is…………newtons.

A block mass m = 2 kg is accelerating by a force F = 20 N applied on a smooth light pully as shown in fig 7.86 If the coefficient of kinetic friction between the block and the surface is mu = 0.3 find its acceleration

A 10 g block placed on a rough horizontal floor is being pulled by a constant force 50 N. Coefficient of kinetic friction between the block and the floor is 0.4. Find work done by each individual force acting on the block over displacement of 5 m.

A wooden block of mass M resting on a rough horizontal surface is pulled with a force T at an angle q to the horizontal. If m is coefficient of kinetic friction between the block and the surface, the acceleration of the block is

A block of mass 1 kg is pressed against a wall by applying a horizontal force of 10N on the block. If the coefficient of friction between the block and the wall is 0.5, magnitude of the frictional force acting on the block is

A 2kg block is placed over a 5kg block and both are placed on a smooth horizontal surface. The coefficient of friction between the blocks is 0.10. Find the acceleration of the two blocks if a horizontal force of 14N is applied to the upper block (g = 10ms^(-2) ).

A block of mass 0.1 kg is held against a wall applying a horizontal force of 5N on block. If the coefficient of friction between the block and the wall is 0.5, the magnitude of the frictional force acting on the block is:

A block of mass 0.1 is held against a wall applying a horizontal force of 5N on block. If the coefficient of friction between the block and the wall is 0.5, the magnitude of the frictional force acting on the block is:

A wooden block of mass m resting on a rough horizontal table is pulled by a force F as shown in the figure. If mu is the coefficient of friction between block and table, its acceleration will be