S3 PHY GRAVITATIONAL FIELD

What is the gravitational force between a 140 kg tree and a 798 kg Lotus Elise Sprint that are 15 m away?

• 6.6*10^-7 N

• 4.8*10⁴ N

• 3.3*10^-8 N

• 7.4*10¹² N

What would the gravitational force be between the Sun and Mars if they were 2.3*10¹¹ m apart? The masses for the Sun and Jupiter are 1.99*10³⁰ kg and 6.42*10²³kg, respectively.

• F_g = 3.8*10¹⁵ N

• F_g = 2.8*10^-42 N

• F_g = 1.6*10²¹ N

• F_g = 4.6*10^-75 N

Calculate the gravitational force between a 15-kg chinchilla and a 65-kg dog which are separated by 0.30 m.

• F_g = 3.7*10^-8 N

• F_g = 1.3*10¹² N

• F_g = 1.1*10⁵ N

• F_g = 7.2*10^-7 N

What is gravitational force?

• It makes objects at rest start moving.
• It makes objects that are moving stop.
• The force of attraction between two objects.
• It pulls you into space.

A student drops a bowling ball and an apple from a third-story window. Both objects hit the ground at the same time. From the experiment, the student should conclude that

• the apple weighs more than the bowling ball

• more air friction is acting on the apple than on the bowling ball

• gravity pulls on both objects, causing them to fall at the same time.

The gravitational force exerted by an object depends on its

• volume

• mass

• weight

Which is needed to determine the amount of gravitational force between two objects?

• distance and mass

• weight and time

• area and weight

A mass m is released just above the surface of a planet with mass M and radius R . Which expression gives its initial gravitational acceleration?

• GmM / R

• GmM / R³

• G M / R²

• GmM / 2 R

A body of mass 20 kg mass is placed 4 m

above the Earth's surface. The value of g

may be taken as lOms^-2 . What are the gravitational field strength and gravitational force acting on the body?

• A

• B

• C

• D

Two isolated masses m₁ and m₂ are separated by a distance r. Which expression gives the gravitational field strength caused by m₁ at m₂?

• G m1m2 / r

• G m1 m2 / r²

• G m1 / r²

• G m2 / r²