Movement in Space

What force keeps planets in orbit around the Sun?

• Magnetic force

• Gravitational force

• Nuclear force

• Electromagnetic force

Why do planets closer to the Sun orbit faster than those farther away?

• They have less mass

• The Sun's gravity is stronger closer to it

• They are smaller in size

• They have more moons

Which factor determines a planet's orbital speed?

• The planet's color

• The planet's atmosphere

• The planet's distance from the Sun

• The number of moons it has

Why don't objects in space slow down like they do on Earth?

• Because there's no friction in space

• Because they're moving too fast

• Because they're too heavy

• Because they're too light

What happens to a planet's speed as it gets closer to the Sun in its orbit?

• It stays the same

• It increases

• It decreases

• It stops completely

Which force causes objects to slow down on Earth but is absent in space?

• Magnetic force

• Electric force

• Friction

• Nuclear force

What shape are most planetary orbits?

• Perfectly circular

• Square

• Elliptical

• Triangular

According to Kepler's laws, what does a planet sweep out in equal times?

• Equal distances

• Equal areas

• Equal circles

• Equal speeds

What would happen to Earth's orbit if the Sun's gravity suddenly disappeared?

• Earth would move closer to the Sun

• Earth would continue orbiting as usual

• Earth would move in a straight line

• Earth would fall into the Sun

Which statement about orbital motion is correct?

• All planets orbit at the same speed

• Outer planets complete their orbits faster

• Inner planets complete their orbits faster

• Planet size determines orbital speed