Uniform Circular Motion & Universal Gravitation

Gravitational Force

100

Newton Discovered

What is that gravity is universal? 

200

Everything is attracted to everything else.

What is the law of Universal Gravitation. 

300

If the mass of one object is doubled the gravitational force will 

What is double. 

400

If the distance between two masses is tripled, the gravitational force between them will ________ by ______. 

Will reduce by 1/9.

500

6.67 x 10^-11 Nm²/kg²

What is the gravitational constant? 

Gravitational Field

100

Field that surrounds earth where a mass will experience a gravitational force. 

What is the gravitational field? 

200

As you move further away from the surface of Earth, the gravitational field ________

What is decreases? 

300

zero

What is the gravitational field at the center of a planet? 

400

Towards the center

What is the direction of the gravitational field? 

500

Your weight is zero inside the cavity of earth because

What is you are being pulled by gravity equally in all directions. 

Orbital Motion

100

A projectile moving fast enough to fall continually around Earth rather than into it.

What is Earth's satellite? 

200

8,000 m/s or 8 km/s

What is the orbital speed for close orbit around Earth? 

300

Oval shaped path

What is an ellipse? 

400

Foci

What are the two fixed points of an ellipse? 

500

In elliptical orbits the speed of satellites _____

What is varies? 

Rotation & Revolution

100

When an object revolves around an internal axis.

What is rotation?

200

When an object moves around and external axis.

What is a revolution?

300

The closer an object is to the center of a rotating object the ________ the linear velocity will be.

What is smaller?

400

The planets movement around the sun is an example of

What is a revolution?

500

Horses that move with the fastest angular speed on a merry-go-round are located

What is anywhere because they all move at the same speed.

Kepler's Laws

100

Each planet moves so that an imaginary line drawn from the sun to any planet sweeps out equal areas of space in equal time intervals.

What is Kepler's second law? 

200

The closer a planet is to the sun, the _______ the period of its motion.

What is shorter? 

300

The path of each planet around the sun is an ellipse with the sun at on focus.

What is Kepler's first law? 

400

Which planet, Jupiter or Saturn, has the longer period? 

What is Saturn? 

500

The square of the orbital period of a planet is directly proportional to the cube of the average distance of the planet from the sun. 

What is Kepler's third law? 

Uniform Circular Motion

100

_________ is the time it take to make one revolution, but ___________ is how often an object completes a revolution.

What is period & frequency?

200

When an object experiences uniform circular motion, the direction of the net force is 

What is towards the center of the circular path.

300

Consider a particle moving with constant speed such that its acceleration of constant magnitude is always perpendicular to its velocity. Describe this particles motion.

What is moving in a circle?

400

A car goes around a curve of radius r and at a constant speed v. Then it goes around the same curve at half the original speed. What is the centripetal force on the car as it goes around the curve for the second time, compared to the first time? 

What is 1/4 as big.

500

As you go over a hill in your car, your apparent weight will be

What is be less than than your normal weight.