Explanation

• A pair of unlike parallel forces (forces that act in opposite directions) with different lines of force produce a couple.
• It is also known as a moment or torque.
• This is a rotational force that tends to cause rotation around a pivot point or axis.

Last verified on 26-10-2026

Explanation

• Newton's second law states that the rate of change of momentum is directly proportional to the applied net force and occurs in the direction of that force.
• The mathematical form is F = Δp / Δt, where p represents momentum.
• For constant mass, the law is commonly written as F = ma.

Last verified on 26-10-2026

Explanation

Explanation

• Einstein's mass-energy equation is E = mc^2.
• In this equation, E represents energy, m represents mass, and c represents the speed of light in a vacuum.
• The speed of light in a vacuum is approximately 3 x 10^8 metres per second.
• The equation shows that mass can be converted into energy and energy into mass.

Last verified on 26-10-2026

Explanation

• Water has maximum density at 4°C.
• When Water is in its Solid form (Ice) below 0°C.

Last verified on 27-10-2026

Explanation

Explanation

• The minimum number of forces required to use the head-to-tail rule for vector addition is two.
• In this method, the tail of the second force vector is placed at the head of the first force vector.
• The resultant force is drawn from the tail of the first vector to the head of the last vector.
• This rule can also be used to add three or more forces.

Last verified on 26-10-2026

Explanation

• Tactile means related to the sense of touch.
• Visible means able to be seen by the sense of sight.
• Both pairs connect a sensory-related word with the sense it is associated with.

Last verified on 26-10-2026

Explanation

Torque is the turning effect of a force around a pivot.

Distance = 10 cm = 0.1 m.

Torque = 100 × 0.1 = 10 Nm.

Last verified on 26-10-2026

Explanation

Potential energy depends on mass, gravitational acceleration, and height.

PE = 50 × 10 × 3 = 1,500 J.

Last verified on 26-10-2026