Physics Test1

Front 1

When cutting cardboard with scissors, why is it a good idea to move the cardboard as close as possible to the scissors' pivot point? (Consider the torque about the pivot.)

Back 1

There is a constant torque, so a small lever arm gives a large force

Front 2

Which is not an example of something with potential energy?

A wound clock spring
A stick of dynamite
A moving car
A ball at the top of a hill

Back 2

moving car

Front 3

A car skids to a stop. What happens to its kinetic energy?

Back 3

turns into thermal energy

Front 4

Impulse is

Back 4

how momentum is transfered

Front 5

work is

Back 5

how energy is transfered

Front 6

spinning carousel is

Back 6

angular momentum

Front 7

When a modern car crashes into a tree and comes to an abrupt stop, the driver's face and chest collide with an air bag rather than with the steering wheel. The driver's chances of serious injury are reduced by hitting the air bag rather than the steering wheel because the driver transfers

Back 7

the same amount of momentum to the air bag as he would to the steering wheel, but he does it with smaller force due to the air bag.

Front 8

A skater who pulls in her arms speeds up because

Back 8

she makes the moment of inertia smaller

Front 9

impulse is

Back 9

force times time

Front 10

Which is bigger, static or sliding friction?

Back 10

static

Front 11

power is

Back 11

work per time

Front 12

push or pull

Back 12

force

Front 13

mass

Back 13

measure of inertia

Front 14

that object thats attracted directly toward the center of the earth with a force we call objects

Back 14

weight

Front 15

lose weight by

Back 15

reducing mass or going some place like small planet where gravity is weeker

Front 16

components

Back 16

the portions of a vector quantity that lie along particular directions

Front 17

trajectory

Back 17

the path taken by an object as it moves

Front 18

support force

Back 18

a force that is exerted when two objects come into contact. each object exerts a force on the other object to keep the two from passing through one another. support forces are always normal, or perpendicular, to the surfaces of objects

Front 19

conserved quantity

Back 19

characteristic of energy. cant be created nor destroyed but can be transferred between objects or, in the case of energy, converted from one form to another

Front 20

energy

Back 20

capacity to do work

Front 21

mechanical advantage

Back 21

the process whereby a mechanical device redistributes the amounts of force and distance that go into performing a particular amount of mechanical work

Front 22

translational motion

Back 22

overall movement of an object from one place to another

Front 23

rotational motion

Back 23

motion around a fixed point