Physics set #1

Total Flash Cards » 25
 
1. 

Your pet hamster sits on a record player whose angular speed is constant. If he moves to a point twice as far from the center, then his linear speed

 

DOUBLES

 
2. 

Which moves faster in m/s on a merry-go-around: a horse on the inside or a horse on the outside near the outer rail?

 

OUTSIDE HORSE

 
3. 

If a turntable rotational speed is doubled, then the linear speed of a pet hamster sitting on the edge of the record will

 

DOUBLE

 
4. 

Suppose the circumference of a bicycle wheel is 2 meters. If it rotates at 1 revolution per second when you are riding the bicycle, then your speed will be

 

2 M/S

 
5. 

An industrial flywheel has a greater rotational inertia when most of its mass is

 

NEAREST THE RIM

 
6. 

A coin and a ring of equal masses and equal diameters roll down an incline, starting from rest at the same time. The one to reach the bottom first will be

 

COIN

 
7. 

A torque acting on an object tends to produce

 

ROTATION

 
8. 

On a balanced seesaw, a boy three times as heavy as his partner sits:

 

1/3 THE DISTANCE FROM THE FULCRUM

 
9. 

Put a pipe over the end of a wrench when trying to turn a stubborn nut on a bolt, to effectively make the wrench handle twice as long, you will multiply the torque by

 

TWO

 
10. 

A leaning tower of Pisa doesn't topple over because its center of gravity is

 

ABOVE THE PLACE OF SUPPORT

 
11. 

A chef at a pizzeria tosses a spinning disk of unbaked pizza dough into the air. The disk dismeter increases during the flight, while its rotational speed

 

DECREASES

 
12. 

Centrifugal forces are an apparent reality to observers in a reference frame that is

 

ROTATING

 
13. 

A person weighs less at the equator than at the poles. The main reason for this has to do with

 

THE SPIN OF THE EARTH

 
14. 

When a twirling ice skater brings her arms inward, her rotational speed

 

INCREASES

 
15. 

Consider a rotating donut-shaped space habitat, where living quarters are on the inside surface fartherst from the axis of rotation. If the rotational speed of the habitat increases, the apparent weight of people inside

 

INCREASES

 
16. 

The center of gravity of a circular disk of sheet metal is located

 

AT THE CENTER OF THE DISK

 
17. 

A carnival has a Ferris wheel where the seats are located halfway between the center and the outside rim. If you were sitting not in a seat but on the outside rim, your angular speed while riding on this Ferris wheel would be

 

THE SAME AS WHEN YOU WERE RIDING IN THE SEAT

 
18. 

For a system in mechanical equilibrium, the resultant

 

TORQUE AND FORCE MUST BE ZERO

 
19. 

A ball rolls down a hill mainly because of

 

AN UNBALANCED TORQUE

 
20. 

A car travels in a circle at a constant speed. The net force on the car is

 

DIRECTED TOWARDS THE CENTER OF THE CAR

 
21. 

A huge rotating cloud of particles in space gravitate together to form an increasingly dense ball of particles. As the cloud shrinks in size, it

 

ROTATES FASTER

 
22. 

If the polar icecaps melted, the resulting water would spread over the entire Earth. This new mass distribution would tend to make the length of the day

 

LONGER

 
23. 

Suppose you are at the center of a large freely-rotating horizontal turntable in a carnival funhouse. As you crawl towards the edge, the angular momentum of you and the turntable

 

STAYS THE SAME

 
24. 

As a rotating ice skater stretches out his arms

 

HIS ROTATIONAL INERTIA INCREASES

 
25. 

Suppose you put very large-diameter tires on your car. Then, your speedometer will show a speed that is

 

LOWER THAN YOUR ACTUAL SPEED