PS: Section 1 and Newton's First Law Pop Quiz

Which of the following is a unit of mass?

• kilogram
• liter
• meter
• pound

The mass of an object ___________________________.

• changes, depending on where it is located
• changes randomly
• changes, depending on temperature
• does not change

Suppose an astronaut were to visit a planet where the gravity is half that of Earth.  His MASS on that planet would be ______________.

• half his Earth mass
• the same as his Earth mass
• twice his Earth mass
• zero

______ is explained as a push or pull motion

• Force

• Friction

• Gravity

• Weight

______ is the attractive force between any two objects that depends on the objects mass and distance to each other.

• Weight

• Gravity

• Net Force

• Rolling Friction

______ is the gravitational force exerted on an object

• Mass

• Gravity

• Force

• Weight

What are the units for Weight?

• Kg

• N

• N/kg

• Joules

What is the weight of a 0.456 kg object?

• 456g

• 0.456kg

• 4.56N

• 456N

Find the mass of a 5kg rock on Mercury with a gravitational pull of 3.59m/s/s.

• 5kg

• 17.95N

• 1.39N

• 0.718N

What is inertia?

• Objects changing their motion on their own.

• Objects moving in a straight line.

• Objects staying still when they are acted on by a force.

• Objects not changing motion unless acted on by an unbalanced force.

Answer explanation

"Inertia" is the tendency of objects to follow Newton's first law: Objects in motion remain in motion and objects at rest remain at rest unless acted on by an unbalanced force.