PS Unit 4B Review

Assume the distance between two objects remains the same. If the mass of one object increases, the force of gravity between the two objects will:

• increase.

• decrease.

• remain the same.

• it is impossible to determine.

Assume the masses of two objects remain the same. If the distance between the two objects increases, the force of gravity between the objects will

• increase.

• decrease.

• remain the same.

• it is impossible to determine.

Newton’s Law of Universal Gravitation can be used to determine the force of gravity between

• an apple and the earth

• the earth and the sun

• the moon and the earth

• any two objects

All objects near or on the earth are affected by

• Normal force

• Force of gravity

• Applied force

• Tension force

Kepler’s First Law of planetary motion states that all planets move in __________ orbits.

• hyperbolic

• elliptical

• circular

• spiral

Which of these satellites must have the greatest velocity in order to stay in orbit?

• TRMM

• Sentinel-2

• SeaStar (Orbview-2)

• JASON

Assume the distance between two objects remains the same. If the mass of one object doubles, the force of gravity between the two objects will

• decrease to half the amount.

• double.

• increase four times.

• decrease four times.

Assume the masses of two objects remain the same. If the distance between the two objects increases 3 times, the force of gravity between the objects will

• be nine times greater.

• be three times greater.

• be nine times less.

• be three times less.

The diagram below shows a planet orbiting around a star. Arrows representing the force of gravity acting on the planet would

• point down

• point along the path of orbit

• point toward the star

• point outward

An apple falling from a tree branch happens because of a gravitational force. Is this a contact force or a non-contact force?

• non-contact force

• contact force

• neither

• both