Laws of Motion Test

Result

Laws of Motion Test - 37

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Question 1
4 / -1

According to newton's second law of motion, F = ma, where F is the force required to produce an acceleration a in a body of mass m. If a = 0 than F = 0. If a force acts on a body for t seconds, the effect of the force is given by impulse = F × t = change in linear momentum of the body.
A cricket ball of mass 150 g. is moving with a velocity of 12 m/s and is hit by a bat so that the ball is turned back with a velocity of 20 m/s. If duration of contact between the ball and the bat is 0.01 sec. The impulse of the force is

A
7.4 NS

B
4.8 NS

C
1.2 NS

D
4.7 NS
Question 2
4 / -1

According to newton's second law of motion, F = ma, where F is the force required to produce an acceleration a in a body of mass m. If a = 0 than F = 0. If a force acts on a body for t seconds, the effect of the force is given by impulse = F × t = change in linear momentum of the body.
Average force exerted by the bat is

A
480 N

B
120 N

C
1200 N

D
840 N
Question 3
4 / -1

According to newton's second law of motion, F = ma, where F is the force required to produce an acceleration a in a body of mass m. If a = 0 than F = 0. If a force acts on a body for t seconds, the effect of the force is given by impulse = F × t = change in linear momentum of the body.
The force acting on a body whose linear momentum changes by 20 kgms^–1 in 10 sec is

A
2 N

B
20 N

C
200 N

D
0.2 N
Question 4
4 / -1

According to newton's second law of motion, F = ma, where F is the force required to produce an acceleration a in a body of mass m. If a = 0 than F = 0. If a force acts on a body for t seconds, the effect of the force is given by impulse = F × t = change in linear momentum of the body.
An impulsive force of 100 N acts on a body for 1 sec What is the change in its linear momentum ?

A
10 N–S

B
100 N–S

C
1000 N–S

D
1 N–S
Question 5
4 / -1

A
a–s, b–p, c–q, d–r

B
a–p, b–q, c–r, d–s

C
a–s, b–r, c–q, d–p

D
a–r, b–q, c–p, d–s
Question 6
4 / -1

A block B, placed on a horizontal surface is pulled with initial velocity V. If the coefficient of kinetic friction between surface and block is μ, than after how much time, block will come to rest ?

A

B

C

D

Solution
Question 7
4 / -1

As shown in figure a block of mass m is attached with a cart. If the coefficient of static friction between the surface of cart and block is μ than what would be acceleration α of cart to prevent the falling of block ?

A

B

C

D

Solution
Question 8
4 / -1

A

B

C

D

Solution
Question 9
4 / -1

A force of 98 N is required to just start moving a body of mass 100 kg over ice. The coefficient of static friction is

A
0.6

B
0.4

C
0.2

D
0.1

Solution
Question 10
4 / -1

Two balls of masses m₁ and m₂ are separated from each other by a powder charge placed between them. The whole system is at rest on the ground. Suddenly the powder charge explodes and masses are pushed apart. The mass m₁ travels a distance s₁ and stops. If the coefficients of friction between the balls and ground are same, the mass m₂ stops after travelling the distance

A

B

C

D

Solution