Force and Pressure Test

Result

Force and Pressure Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

A spring scale reads 20 newtons as it pulls a 1 kg mass across a table. What is the magnitude of the force exerted by the mass on the spring scale?

A
49 N

B
20 N

C
15 N

D
4 N

Solution

According to Newton's 3^rd law of motion, to every action, there is an equal and opposite reaction. So, magnitude of the force exerted by the mass on the spring scale is 20 N.
Question 2
1 / -0

A force acts for 5 s on a stationary body of mass 200 kg after which the force ceases to act. The body moves through a distance of 20 m in the next 2 s. What is the magnitude of force applied?

A
800 N

B
200 N

C
100 N

D
400 N

Solution

t = 5 sec
m = 200 kg
Since the body moves 20 m in 2 sec after the application of force, distance of 10 m is covered in 1 sec. So, the object moves with the velocity of 10 m/s.
F = 200 x 10/5 = 400 N
Question 3
1 / -0

An object of mass 300 g is resting on a frictionless table. Calculate the acceleration of the object when it is acted upon by a force of 0.03 N.

A
1 ms^–2

B
10 ms^–2

C
3 ms^–2

D
0.1 ms^–2

Solution

F = m*a
a = F/m = 0.03/0.3
= 0.1 m/s^-2
Question 4
1 / -0

A force of 20 N acts on a body of mass 4 kg for 6 s initially at rest. What is the velocity acquired by the body and the change in momentum of the body?

A
15 m/s, 30 kg m/s

B
15 m/s, 60 kg m/s

C
30 m/s, 120 kg m/s

D
30 m/s, 80 kg m/s

Solution

F = m.a
F = m(v-u)/t
v = (20*6)/4 = 30m/s
Change in momentum = m* (v-u) = 4* 30 = 120 kg m/s