Chapter 6

Question 1

motion of an object in a circular path at constant speed

Answer 1

uniform circular motion

Question 2

centrifuge optimized for spinning a rotor at a very high speeds

Answer 2

ultracentrifuge

Question 3

ratio of the arc length to the radius of a curvature on a circular path: Δθ = Δs/r

Answer 3

rotation angle

Question 4

radius of a circular path

Answer 4

radius of curvature

Question 5

unit of angle measurement

Answer 5

radian

Question 6

tiny indentation on the spiral track moulded into the top of the polycarbonate layer of CD

Answer 6

pit

Question 7

accelerated frame of reference

Answer 7

non-inertial frame of reference

Question 8

every particle in the universe attracts every other particle with a force along a line joining them

Answer 8

Newton’s universal law of gravitation

Question 9

force is directly proportional to the product of their masses and inversely proportional to the square of the distance between them

Answer 9

Newton’s universal law of gravitation

Question 10

Environment in which the apparent net acceleration of a body is small compared with that produced by earth at its surface

Answer 10

Microgravity

Question 11

Maximum safe speed at which a vehicle can turn on a curve without the aid of friction between the tire and the road

Answer 11

Ideal speed

Question 12

Net external force on vehicle equals the horizontal centripetal force in the absence of friction

Answer 12

Ideal banking

Question 13

Sloping of a curve in a road, where the angle of the slope allows the vehicle to negotiate the curve at a certain speed without the aid of friction between the tires and the road

Answer 13

Ideal banking

Question 14

Angle at which the car can turn safely on a steep curve, which is in proportion to the ideal speed

Answer 14

Ideal angle

Question 15

Proportional factor used in the equation for newton’s universal law of gravitation

Answer 15

Gravitational constant, G

Question 16

A universal constant - that is, it is thought to be the same everywhere in the universe

Answer 16

Gravitational constant, G

Question 17

Force having no physical origin

Answer 17

Fictitious force

Question 18

Fictitious force causing the apparent deflection of moving objects when viewed in a rotating frame of reference

Answer 18

Coriolis force

Question 19

Net force causing uniform circular motion

Answer 19

Centripetal force

Question 20

Acceleration of an object moving in a circle, directed toward the center

Answer 20

Centripetal acceleration

Question 21

Fictitious force that tends to throw an object off when the object is rotating in a non-inertial frame of reference

Answer 21

Centrifugal force

Question 22

Point where the entire mass of an object or of a system of objects can be thought to be concentrated

Answer 22

Center of mass

Question 23

Curve in a road that is sloping in a manner that helps vehicle negotiate the curve

Answer 23

Banked curve

Question 24

Δs, the distance traveled by an object along a circular path

Answer 24

Arc length

Question 25

rate of change of the angle with which an object moves on a circular path

Answer 25

Angular velocity