Mass and weight

Mass is a measure of the quantity of matter in an object. The van has more mass than the toy car because the van contains a greater quantity of matter (more atoms and molecules) than the toy car.

Weight (W) = mass (m) × gravitational field strength (g)
W = 0.15 kg × 9.8 N/kg
W = 1.47 N

Weight is calculated by multiplying the mass of an object by the gravitational field strength.

Formula: Weight (W) = mass (m) x gravitational field strength (g)
Working: W = 2.0 kg x 9.8 N/kg = 19.6 N
Answer: The weight of the brick is 19.6 N. The weight is the force due to gravity acting on the mass.

Mass is compared using a balance. The masses on each side must be equal for the balance to be level.

Total mass on balancing side = 0.5 kg + 0.15 kg = 0.65 kg

Therefore, the unknown mass = 0.65 kg

Answer: 0.65 kg

A simple balance works on the principle of moments. Place one object on each side of the balance. If the balance is level, the moments on each side are equal, meaning the masses are equal. If one side is lower, its mass is greater. The greater the difference in height/angle, the greater the mass difference between the objects.

Weight (W) = mass (m) x gravitational field strength (g)
W = 0.75 kg x 9.8 N/kg
W = 7.35 N

Explanation: Weight is the force experienced by a mass due to gravity. It's calculated by multiplying the object's mass by the local gravitational field strength.

Weight is the force exerted on an object due to gravity. It is directly proportional to both the object's mass and the gravitational field strength at the object's location. A larger mass or a stronger gravitational field will result in a greater weight.