friction

1. A horizontal force 10N is applied to 6kg block which rest on horizontal surface , if coefficient of friction is 0.3 , Find the force of limiting friction.

• 8N
• 12N
• 16N
• 18N

Tags

NGSS.HS-PS2-1

2. Find the coefficient of static friction , if 10 N force acting horizontally on a block of mass 5 kg resting on a horizontal surface is needed to just start the block moving over the horizontal surface

• 0.1
• 0.2
• 0.3
• 0.4

Tags

NGSS.MS-PS2-2

3. A horizontal force of 30 N is applied to 20 kg block , if the coefficient of kinetic friction is 0.1 , find the acceleration of 20 kg block (g=10m/s 2 )

• 0.5 m/s 2
• 2 m/s 2
• 5m/s 2
• 10 m/s 2

Tags

NGSS.HS-PS2-1

4. Calculate Force Required to move a train of 2000quintals up on incline of 1 in 50 with an acceleration of 2m/s 2, the force of friction being 0.5N per quintal.

• 540200N
• 440200N
• 740200N
• 940200N

Tags

NGSS.HS-PS2-1

5. calculate power of engine which can pull a train of mass 25000 quintals up an incline of 1 in 100 at the rate of 10.8km/h ,Resistance due to friction is 2N per quintal,(take g=10m/s 2)

• 7 x10 4 watt
• 8.x10 3 watt
• 9x10 5 watt
• 10 x10 6 watt

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-1

6. An object is moving on a plane surface with uniform velocity 10m/s in presence of force 10N , The frictional force between the object and the surface is

• 1N
• 10N
• 15N
• 20N

Tags

NGSS.HS-PS2-1

7. Maximum value of static frictional force is equal to

• limiting friction
• rolling friction
• static friction
• none of these

8.Force of friction is caused due to

• Roughness of two surface
• weight of the body
• both a and b
• none of these

9. The unit of coefficient of friction?

• newton
• m/s
• m
• none of these

10. What is the relation between coefficient of friction and angle of repose

• μ=sinα
• μ=tanα
• f=tanμ-sinα
• none of these