U2L4 Review Quizizz (Gravity)

Which of the following describes gravitational force?

• contact, repulsive

• contact, attractive

• noncontact, attractive

• noncontact, repulsive

Which of the following describes the cause and effect relationship between gravity and falling objects?

• Gravity causes objects to fall toward the center of Earth.

• Gravity causes objects to repel from the center of Earth.

• Gravity is caused by objects’ attraction to the center of Earth.

• An object’s force is caused by gravity’s attraction to the center of Earth.

The strength of gravitational forces on an object near Earth’s surface depends on

• Earth’s mass.

• the object’s mass.

• the object’s speed.

• whether the object is falling.

What is likely to happen to the way an object moves if gravitational forces on the object do not change?

• The object will move in predictable ways.

• The object will move in unpredictable ways.

• The object will be pushed slightly away from Earth.

• The object will be pulled closer to the center of Earth.

Which object has greater acceleration when acted on by gravitational forces? A 2 kg apple, a 7 kg bowling ball, or a 20 kg rock?

• the 2 kg apple

• the 7 kg bowling ball

• the 20 kg rock

• They all have the same acceleration when acted on by gravitational forces.

Which of the following is the acceleration caused by Earth’s gravity?

• 5 m/s2

• 9.8 m/s2

• 15.2 m/s2

• 20 m/s2

Why doesn’t a feather fall at the same rate as an apple?

• Feathers are too light to be affected by gravitational forces.

• Gravitational forces affect different objects in different ways.

• Air resistance reduces an object’s downward acceleration and affects objects differently.

• Air resistance increases an object’s downward acceleration and affects objects differently.

An orbit is a path that

• an object follows as gravitational forces act on it.

• an object in space follows around another object due to gravitational forces.

• an object that is changing acceleration follows as it changes speed or direction.

• connects two objects that are being affected by the same gravitational forces.

What is the cause and effect relationship between orbits and gravity?

• Gravity causes the effect of moving in an orbit.

• Moving in an orbit causes the effect of gravity.

• Gravity and orbits cause the shape of Earth’s curve.

• Gravity and orbits cause the effect of an object’s acceleration.

Why is the moon never pulled into the Earth despite gravitational forces that pull it toward Earth?

• The moon has enough of its own gravity to avoid being pulled to Earth.

• The moon is so large that gravity repels it from Earth rather than pulls it.

• The moon is pulled toward the sun with a force equal to Earth’s pull on it.

• The moon moves forward fast enough so that it is never pulled into Earth.