Forces and Laws of Motion Test

Result

Forces and Laws of Motion Test - 11

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Question 1
1 / -0

Which physical quantity is responsible for the change in speed or direction of a moving body?

A
Force

B
Inertia

C
Energy

D
Velocity

Solution

Force is the physical quantity that causes acceleration in a body. It causes the body to gain speed or direction.

The correct answer is A.

Why alternative B is wrong:Inertia is the property of an object that allows it to remain constantly in velocity unless it is acted upon by an outside force. Hence, this alternative is incorrect.

Why alternative C is wrong:Energy is the universal attribute of any type of physical system that is measurable and expressible as a real number. Hence, this alternative is incorrect.

Why alternative D is wrong:Velocity is the speed of an object in a particular direction. It cannot influence speed or direction of the object. Hence, this alternative is incorrect.
Question 2
1 / -0

The force on an object is directly proportional to the

A
sum of its mass and acceleration

B
product of its mass and acceleration

C
ratio between its mass and acceleration

D
difference between its mass and acceleration

Solution

Newton’s second law of motion states that the force on an object is directly proportional to the product of its mass and the acceleration produced by the force. This can be mathematically represented as F = m × a.

The correct answer is B.
Question 3
1 / -0

A body with a mass two kilograms will accelerate by 6 m/s²when it is subject to a force of magnitude

A
2 N

B
6 N

C
12 N

D
15 N

Solution

The force on the body is given as,

F = m × a

Where, m = Mass of the body = 2 kg

a = Acceleration of the body = 6 m/s²

∴ F = 2 kg × 6 m/s² = 12 N

The correct answer is C.