Dynamics I: Mass and Weight

Which pair of forces are contact forces?

• gravitational force, air resistance

• magnetic force, air resistance

• normal force, friction

• tension, electrostatic force

Weight is .....................................

• acceleration due to free fall

• gravitational field strength

• gravitational force

• gravitational field

Which of the following statement about mass is correct?

• Mass is a scalar quantity and depends on location.

• Mass is a scalar quantity and does not depend on location.

• Mass is a vector quantity and depends on location.

• Mass is a vector quantity that does not depend on location.

The following table shows the masses and weights of objects P, Q, R and S on several planets.

Which two objects are likely to be on the same planet?

• P and Q

• P and S

• Q and R

• R and S

The weight of an object on Earth is 120 N. The gravitational field strength of Earth is six times the gravitational field strength on the moon.

What is the mass and weight of the objects on the moon?

• Option A

• Option B

• Option C

• Option D

The following shows a balance used to determine the mass of an object. Given that 150g of masses was used on the right pan to balance the object on Earth, determine the mass needed to balance the same object on the Moon (gravitational field strength on the Moon is smaller than that on Earth).

• Smaller than 150g

• 150g

• Larger than 150g

• Unable to determine based on information given