(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Physics

Complete the following:

1 N = ............kgf (approx)

Complete the following

Newton is the unit of .................

Which of the following is not the force at a distance:

(a) electrostatic force

(b) gravitational force

(c) frictional force.

(d) magnetic force.

Newton's second law of motion applicable in all condition is:

(a) `F = (Δp)/(Δt)`

(b) F = ma

(c) `F = M (Δv)/(Δt)`

(d) all three

A body of mass 1 kg is thrown vertically up with an initial speed of 5 m s^-1. What is the magnitude and direction of force due to gravity acting on the body when it is at its highest point? Take G = 9.8 n kg^-1

A body of mass 1.5 kg is dropped from a height of 12 m. What is the force acting on it during its fall? (g = 9.8 ms^-2)

Two balls of masses in ratio 1 : 2 are dropped from the same height find

a) the ratio between their velocities when they strike the ground and

b) the ration if the forces acting on them during motion.

How much acceleration will be produced in a body of mass 10 kg acted upon by a force of 2 kgf?(g = 9.8 ms^-2)

Two bodies have masses in the ratio 3 : 4 when a force is applied on the first body. it moves with an acceleration of 6 ms^-2 . How much acceleration will the same force produce in the other body? 

A cricket ball of mass 100 g strikes the hand of a player with a velocity of 20 ms^-1 and is brought to rest in 0.01 s calculate

1) the force applied by the hand of the player.

2) the acceleration of the ball

A lead bullet of mass 20g, travelling with a velocity of 350 ms^-1, comes to rest after penetrating 40 cm in a still target. Find:

1) the resistive force offered by the target and 

2) the retardation caused by it

A body of mass 50g is moving with the velocity of 10 ms^-1. It is brought to rest by a resistive force of 10 N Find.

1) the retardation and 

2) the distance that the body will travel after the resistive force is applied.

A uniform car of mass 500g travels with a uniform velocity of 25 ms^-1 for 5 s. The brakes are then applied and the car is uniformly retarded and comes to rest in further 10 s calculate 

1) the retardation

2) the distance which the car travels after the brakes are applied 

3) The force exerted by the brakes.

A truck of mass `5 xx 10^3` kg starting from rest travels a distance of 0.5 km in 10 s when a force is applied on its calculate:

1) the acceleration acquired by the truck and

2) the force applied

A force od 10 kgf is applied on a body of mass 100 g initially at rest for 0.1 s calculate:

a) the momentum acquired by the body

b) the distance travelled by the body in 0.1s. Take g = 10 N kg^-1

Why is it easier to open a door by applying the force at the free end of it?

The adjacent diagram shows a heavy roller, with its axle at O, which is to be raised on a pavement XY. If there is friction between the roller and pavement, show by an arrow on the diagram the point of application and the direction of force to be applied. If pivoted at O, now will it go up?

When is work said to be done by a force?

State four ways in which machines are useful to us.

Name a machine to multiply force ?