Show:
Centripetal Force
Basics
Centripetal Acceleration
Fn and Roller Coasters
Tension & Friction
Newton's Universal Law of Gravitation
100

Centripetal force is the net force causing the centripetal ________ of an object in circular motion.

acceleration

100

A car is moving around a circular track at a constant speed. Explain if it is accelerating. 

yes, accelerating because changing direction

100
What will happen if the velocity is too low and Fn < 0 on a upside down loop de loop coaster?

What is the person will fall out!

100

What type of force can provide centripetal force in the case of a car turning on a flat road?

friction

100

Newton's law of gravitation states that every particle attracts every other particle with a force that is ________ proportional to the product of their masses.

directly

200

Centripetal force is necessary for an object to follow a ________ path.

circular

200

The formula for centripetal acceleration is ________.

ac = v2 / r

200

For a passenger to truly be weightless, the normal force must be ____________. 

What is Zero?

200

A ball is twirled in a horizontal circle on a string. At the instant the string is cut, the ball will travel in this direction.

straight line tangent to the circle

200

The gravitational force between two masses is ________ proportional to the square of the distance between them.

inversely

300

Centripetal force acts in what direction? 

towards the center of a circle

300

Knowing the radius and time for an object to swing around a circle, what equation is used to calculate the speed? 

VC = (2*pi*r)/t

300

At what point in a loop de loop does a passenger feel closest to weightlessness?

What is at the top of the circle?

300

These factors affect how fast a car can travel around a curve in the road. 

coefficient of friction and radius of the circle

300

The gravitational constant G is approximately equal to ________.

6.67 × 10-11 N⋅m2/kg2

400

These forces and their direction are acting on the side of an object being swung around a circle on a string. 

Tension into the circle, Fg straight down

400

A student swings a ball on a string in a horizontal circle. If the ball's speed is doubled while the radius stays the same, the centripetal acceleration will _____________. 

What is quadruple (increase by a factor of 4)?

400

What does a passenger feel at the bottom of an loop de loop of a Roller Coaster?

What is feels heavier or being pushed down in your seat

400

With what maximum speed can a 2000 kg car turning around a 30 meter radius curve on a flat, horizontal road with a coefficient of friction 0.67 travel to avoid getting into an accident?

14.03 m/s

400

The Earth is considerably more massive than the moon. How does the force between the Earth and moon compare to the force between the moon and Earth?

equal and opposite

500

If a circular road was banked, rather than flat horizontal, how would the maximum velocity change?

the banked road decreases Fn, decreases Ff, decreases Fc, decreases velocity

500
The centripetal acceleration of an object taking 1.38 seconds to travel around a circle with a radius of 1.2 meters is _______________. 

What is 5.46 m/s2?

500

The Normal Force acting on a 400 kg Roller Coaster traveling 15 m/s at the bottom of a 20 meter loop is _____________. 

8420 Newtons

500

What is the Tension of a 0.8 kg ball traveling at 3 m/s at the top of a 0.4 meter circle?

10.16 Newtons

500

If an astronaut weighs 900 N on Earth, what is her weight at a distance 3x further away?

100 Newtons