Physics Chapter 9: Gravity and Circular Motion

If a satellite moves with a constant speed in a perfectly circular orbit around the Earth, what is the direction of the force of the satellite?

• in the forward direction

• the acceleration is zero because the speed in constant

• inward toward the Earth

• outward away from the Earth

An object moves in a circular path at a constant speed.

Compare the direction of the object's Force and acceleration vectors.

• The vectors point in opposite directions

• the acceleration is zero but the velocity is constant

• both vectors point in the same direction

• the vectors are perpendicular to each other

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The Mood is accelerated towards Earth, so it is gradually getting closer to the Earth

• True

• False

You are making a circular turn in your car on a horizontal road when you hit a big patch of ice, causing the force of friction between the tires and the road to become zero. While the car is on the ice, it____.

• moves along a path that is neither straight nor circular

• moves along a straight-line path in its original direction

• moves along a straight-line path toward the center of the circle

• moves along a straight-line path in its original direction

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A car goes around a circular curve on a horizontal road at a constant speed. What is the direction of the friction force on the car due to the road?

• perpendicular to the curve inward

• perpendicular to the curve outward

• tangent to the curve in the forward direction

• tangent to the curve opposite of the direction of the car's motion

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As an astronaut approaches the Earth from Mars, what can be said about the force of gravity experienced between the Astronaut and the Earth only?

• the force of gravity from earth is stronger the closer the astronaut is to earth

• the force of gravity from earth is stronger as the astronaut is closer to mars

• the force of gravity from earth is non-existent as the astronaut is closer to mars

• the force of gravity from mars is weaker the further the astronaut is to mars

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How far are two cars in a showroom if they experience a gravitational force of 3.6x10^-5 N and have a mass of 4,300 kg and 3,200 kg respectively?

• 4.84 x 10^-5 meters

• 5.02 meters

• 5.1 meters

• 1.5 meters

What is the mass of a box that is experiencing a gravitational force of 2.7x10^-8 N from a person whose mass is 65 kg and is separated from the box by 0.46 meters?

• 1.9 x 10^-10

• 3.8 kg

• 13.2 kg

• 1.3 kg

The further away an object is from another object (in other words: as distance increases between those two objects) what happens to the force of gravity?

• force of gravity increases

• force of gravity decreases

• force of gravity remains the same

• force of gravity eventually stops applying

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What is the difference between g and G?

• g is the acceleration due to the gravity measured in m/s². G is the universal gravitational constant measured in Nm²/kg²

• the are the same thing but one is lowercase and one is uppercase

• g is the universal gravitational constant. G is the acceleration due to the gravity.