Gravitational Forces and Measurements

Mr. Andersen explains gravitational force, differentiating it from mass. He illustrates how weight is measured using scales, not balances, and how gravitational force is calculated by multiplying mass by gravitational field strength. The video covers the concept of free fall and how gravitational fields affect objects. Practical examples are provided to reinforce understanding.

What is the primary difference between a balance and a scale?

• A balance measures weight, while a scale measures mass.

• Both measure mass but in different units.

• A balance measures mass, while a scale measures weight.

• Both measure weight but in different units.

Why does a scale show a different weight for an object on the moon compared to Earth?

• The gravitational field strength is weaker on the moon.

• The object's mass changes on the moon.

• The object's volume changes on the moon.

• The scale is calibrated differently on the moon.

How is gravitational force calculated?

• By subtracting gravitational field strength from mass.

• By multiplying mass by gravitational field strength.

• By adding mass and gravitational field strength.

• By dividing mass by gravitational field strength.

What is the gravitational field strength on Earth?

• 9.8 meters per second squared

• 9.8 newtons per kilogram

• 9.8 kilograms per newton

• 9.8 meters per kilogram

What happens to an object in free fall in a gravitational field?

• It accelerates in the direction of the field.

• It remains stationary.

• It moves upwards.

• It decelerates in the direction of the field.

What is the relationship between gravitational field strength and acceleration due to gravity?

• They are inversely proportional.

• They are unrelated.

• They are the same in both value and units.

• They are numerically equal but have different units.

If an object has a mass of 250 kg, what is its weight on Earth?

• 2450 newtons

• 245 newtons

• 250 newtons

• 2500 newtons

What unit should be used to measure weight in a physics lab?

• Kilograms

• Pounds

• Grams

• Newtons

What does a gravitational field do to an object with mass?

• It has no effect on the object.

• It changes the object's mass.

• It exerts a force on the object.

• It changes the object's volume.

What is the effect of Earth's size on gravitational field vectors?

• They diverge from each other.

• They are perpendicular to each other.

• They converge towards each other.

• They are parallel to each other.