Gravity (Centripetal Force)

Any force that causes an object to move in a circle is called a(n)

• balanced force

• gravitational force.

• unbalanced force

• centripetal force

A skydiver with a mass of 70 kg accelerates to Earth at a rate of 9.8 m/s2 due to gravity. What is the force on the skydiver?

• 79.8 Newtons

• 7.14 Newtons

• 0.14 Newtons

• 68.60 Newtons

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The law of universal gravitation states that any two objects in the uni-verse that have mass, without exception,

• attract each other.

• repel each other.

• combine to provide a balanced force.

• create friction

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The force of gravity is responsible for continuously changing the ____________________ in which a satellite moves.

• direction

• orbit

• centripetal force

• gravitation

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A force of attraction between objects because of their mass is ____________.

• acceleration

• weight

• friction

• gravity

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On earth, 9.8 m/s2 is the rate of _________________.

• gravity

• mass

• magnetism

• none of these

The force of gravity depends on _________ and _________.

• water and heat

• mass and distance

• mass and weight

• weight and distance

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An object is in ______ _____ when no other forces are acting on it.

• amazing grace

• free time

• free fall

• fall time

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Acceleration in a circular motion is

• acceleration squared

• centripetal acceleration

• forced acceleration

• gravitational acceleration

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What is the role of centripetal force in circular motion?

• It keeps an object moving in a straight line.

• It causes an object to move in a circular path.

• It increases the speed of an object.

• It decreases the mass of an object.