Circular Motion and Kepler's Laws

Question 1

Car moves around the below path. When the car is at the top, what is the direction of ac?

Accepted Answer

Down

Question 2

Two objects are attracted to each other with a force F.If the distance between them reduced to a third, the new force is

Accepted Answer

9 F

Question 3

What is the variable for tension?

Accepted Answer

FT

Question 4

An object makes five complete revolutions in 20 s. What is the period?

Accepted Answer

4 s

Question 5

Which of the following cannot be centripetal forces?

Accepted Answer

all of these can be centripetal forces

Question 6

A tetherball spins in a circle at the end of a rope. If the rope snaps, the ball will

Accepted Answer

move in a straight line with a constant speed tangent to the line

Question 7

A pilot flies in a vertical circle. Which is true about the pilot's apparent weight?

Accepted Answer

It is highest at the bottom of the circle

Question 8

What is the unit for period?

Accepted Answer

s

Question 9

When in its orbit is the gravitational force the weakest

Accepted Answer

When it is furthest from the sun

Question 10

A boy stands at the edge of a rotating table. Which force prevents him from sliding off?

Accepted Answer

static friction

Question 11

A car moves around the below path. When the car is at the top, what is the direction of its velocity

Accepted Answer

Left

Question 12

Why do you move toward the left door of a car making a right turn?

Accepted Answer

inertia

Question 13

A car moves around a circular path of constant radius at constant speed. Which is true?

Accepted Answer

The car's acceleration is directed toward the center

Question 14

What is the variable for period?

Accepted Answer

T

Question 15

What does G represent?

Accepted Answer

The gravitational constant 6.67x10-11

Question 16

Can an object have a constant speed but still accelerate?

Accepted Answer

Yes, if the direction is changing, so is the velocity

Question 17

When in its orbit is a planet moving fastest

Accepted Answer

When it is closest to the sun

Question 18

Two objects are attracted to each other with a force F. If one mass is tripled and one is halved, the new force is

Accepted Answer

3/2 F

Questions 18