Mass and Weight

Write the unit of mass

• Newtons (N)

• ounces (oz)

• milligrams (mg)

• kilograms (kg)

Write the unit of weight

• newtons (N)
• kilograms (kg)
• pounds (lb)
• grams (g)

Mass and weight have different units. Write down one other difference between mass and weight.

• Mass is constant regardless of location, while weight varies with the strength of the gravitational field.
• Weight is a measure of volume, while mass is a measure of density.
• Mass can change based on speed, while weight remains the same.
• Mass is measured in kilograms, while weight is measured in grams.

What is the mass of the object on planet Y?

• 15
• 25
• 30
• 20

The force of gravity on planet Z is half the force of gravity on planet W. What is the weight of the object on planet Z?

• 100 N
• 150 N
• 200 N
• 50 N

Which of the following statements is true about weight?

• Weight is a scalar quantity only.

• Weight is measured in liters.

• Weight is affected by the mass of an object and the gravitational pull.

• Weight is the same on the Moon and Earth.

How does the mass of an object affect its gravitational force?

• Gravitational force is only dependent on distance.

• Greater mass results in a stronger gravitational force.

• Greater mass results in a weaker gravitational force.

• Mass has no effect on gravitational force.

The weight of the spacecraft on the moon is different from its weight on the Earth. Explain why.

• The weight of the spacecraft is the same on both the Moon and Earth.
• The spacecraft weighs more on the Moon due to its smaller size.
• The weight difference is caused by the spacecraft's fuel consumption.
• The weight of the spacecraft on the Moon is less than its weight on Earth because the Moon's gravity is weaker.

Explain why the spacecraft leaving the moon moves upwards faster than when it leaves the Earth. Use the force diagram to give two reasons.

• 1. 1. The arrows are the same

  2. 2. The arrows point at direction

• 1. 1. There's more weight on earth

  2. 2. There's air resistance on earth

• 1. 1. They both have weight

  2. 2. Only the earth has air resistance

• 1. 1. Thrust is longer than weight

  2. 2. Weight has the same length with the thrust.