Part-3 Newton's law of motion easy

Welcome to your Part-3 Newton's law of motion easy

A body of mass 2 kg is moving with a velocity 8 m/s on a smooth surface. If it is to be brought to rest in 4 seconds, then the force to be applied

8 N

4 N

2 N

1 N

The apparent weight of the body, when it is travelling upwards with an acceleration of 2 m/s² and mass is 10 kg, will be

198 N

164 N

140 N

118 N

A 30 gm bullet initially travelling at 120 m/s penetrates 12 cm into a wooden block. The average resistance exerted by the wooden block is

2850N

2200 N

2000N

1800 N

A force of 10 Newton acts on a body of mass 20kg for 10 seconds. Change in its momentum is

5 kg m/s

100 kg m/s

200 kg m/s

1000 kg m/s

A body of mass 1.0kg is falling with an acceleration of 10 m/sec² . Its apparent weight will be (g=10m/sec²)

1.0 kg wt

2.0 kg wt

0.5 kg wt

Zero

A player caught a cricket ball of mass 150 gm moving at the rate of 20 m/sec. if the catching process be completed in 0.1 sec the force of the blow exerted by the ball on the hands of player is

0.3 N (b) (c) 300 N (d)

30 N

300 N

3000 N

If rope of lift breaks suddenly, the tension exerted by the surface of lift (a = acceleration of lift)

mg

m(g+a)

m(g-a)

0

A boy whose mass is 50kg stands on a spring balance inside a lift. The lift starts to ascent with an acceleration of 2ms‾² The reading of the machine or balance (g=10ms‾²) is

50 kg

Zero

49 kg

60 kg

A rocket is ejecting 50g of gases per sec at a speed of 500m/s The accelerating force on the rocket will be

125 N

25 N

5 N

Zero

A block of mass 5kg is moving horizontally at a speed of 1.5 m/s. A perpendicular force of 5N acts on it for 4 sec. What will be the distance of the block from the point where the force started acting

10 m

8 m

6 m

2 m

A lift of mass 1000 kg is moving with an acceleration of 1 m/s² in upward direction. Tension developed in the string, which is connected to the lift, is

9,800 N

10,000 N

10,800 N

11,000 N

A lift is moving down with acceleration a. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively

g,g

g-a,g-a

g-a,g

a,g

A man weighs 80 kg. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5m/s² What would be the reading on the scale. (g=10m/s²)

400 N

800 N

1200 N

Zero

A monkey of mass 20kg is holding a vertical rope. The rope will not break when a mass of 25 kg is suspended from it but will break if the mass exceeds 25 kg. What is the maximum acceleration with which the monkey can climb up along the rope (g=10m/s²)

10 m/s²

25 m/s²

2.5 m/s²

5 m/s²

A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N, when the lift is stationary. If the lift moves downward with an acceleration of 5 m/s² the reading of the spring balance will be

49 N

24 N

74 N

15 N

A plumb line is suspended from a ceiling of a car moving with horizontal acceleration of a. What will be the angle of inclination with vertical

tan‾¹(a/g)

tan‾¹(g/a)

cos‾¹(a/g)

cos‾¹(g/a)

Mass of a person sitting in a lift is 50 kg. If lift is coming down with a constant acceleration of 10m/s² Then the reading of spring balance will be (g=10m/s²)

0

1000N

100 N

10 N

A body of mass 2 kg has an initial velocity of 3 meters per second along OE and it is subjected to a force of 4 N in a direction perpendicular to OE. The distance of the body from O after 4 seconds will be

12 m

20 m

8 m

48 m

A block of mass m is placed on a smooth wedge of inclination θ. The whole system is accelerated horizontally so that the block does not slip on the wedge. The force exerted by the wedge on the block (g is acceleration due to gravity) will be

mg cosθ

mg sinθ

mg

mg/cosθ

A machine gun fires a bullet of mass 40 g with a velocity 1200ms‾¹ The man holding it can exert a maximum force of 144 N on the gun. How many bullets can he fire per second at the most

One

Four

Two

Three

An automobile travelling with a speed of 60 km/h can brake to stop within a distance of 20 m. If the car is going twice as fast, e. 120 km/h, the stopping distance will be

20 m

40 m

60 m

80 m

A man of weight 75 kg is standing in an elevator which is moving with an acceleration of 5m/s² in upward direction the apparent weight of the man will be (g=10m/s²)

1425 N

1375 N

1250 N

1125 N

The linear momentum p of a body moving in one dimension varies with time according to the equation p=a+bt² where a and b are positive constants. The net force acting on the body is

A constant

Proportional to t²

Inversely proportional to t

Proportional to t

The spring balance inside a lift suspends an object. As the lift begins to ascent, the reading indicated by the spring balance will

Increase

Decrease

Remain unchanged

Depend on the speed of ascend

There is a simple pendulum hanging from the ceiling of a lift. When the lift is stand still, the time period of the pendulum is T. If the resultant acceleration becomes g/4 then the new time period of the pendulum is

0.8 T

0.25 T

2 T

4 T

Part-3 Newton's law of motion easy

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