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Physics > Exam 3/16/17 > Flashcards

Exam 3/16/17 Flashcards

1
Q

How many radians are in a circle?

A

2π

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2
Q

The symbol for the SI unit of angular speed is…

A

rad/second, or s-1.

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3
Q

What 2 factors does gravitational force depend?

A

Radius and mass

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4
Q

The symbol G in the formula for Newton’s law of gravitation is…

A

6.674 x 10⁻¹¹ and it is a universal constant.

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5
Q

What is the unit of work?

A

joule

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6
Q

The force exerted by a spring is called a(n) (Hint: Persons name)

A

Hooke’s law force

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7
Q

The SI unit of power is the…

A

watt

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8
Q

How much will the kinetic energy of a school bus increase if its velocity is doubled?

A

4 times

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9
Q

Provide 2 examples of conservative forces.

A

1) Gravity
2) Central forces
3) Hookes Law forces
4) Electric force.

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10
Q

Provide 2 examples of non-conservative forces.

A

1) Friction

2) Air resistance

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11
Q

The formula Ug = |mg| h is used to determine

A

gravitational potential energy.

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12
Q

mechanical energy that objects possess because of position or condition

A

potential energy

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13
Q

the SI unit of energy and work

A

joule

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14
Q

the rest position of a system (the state of 2 forces balancing out)

A

equilibrium

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15
Q

a value used in Hooke’s Law with the units N/m. (represented by k).

A

Spring constant

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16
Q

the energy transferred to or from a system as a force acts on it through a displacement

A

Work

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17
Q

SI unit of power

A

Watt

18
Q

a scientific law that states that within the elastic limit of a material, the restoring force is directly proportional to the displacement of the system from its equilibrium position

A

Hooke’s Law

19
Q

the property of a system that gives it the ability to do work

A

Energy

20
Q

a force that can convert kinetic energy to potential energy and vice versa without loss

A

Conservative Force

21
Q

the sum of the potential energy and kinetic energy of a system

A

total mechanical energy

22
Q

the time-rate at which work is performed.

A

power

23
Q

a lever in which the load is between the fulcrum and the effort force

A

second-class lever

24
Q

the ratio of the output force of a machine to its input when friction is not present

A

ideal mechanical advantage

25
Q

a lever in which the fulcrum is between the resistance load and the effort force

A

first-class lever

26
Q

the ratio of useful work output to work input for a machine

A

efficiency

27
Q

the ratio of a machine’s output force to its input force

A

actual mechanical advantage

28
Q

a raised surface. (A ramp)

A

inclined plane

29
Q

a lever in which the effort force is applied between the fulcrum and the load

A

third-class lever

30
Q

what is an example of a third-class lever?

A

broom

tweezers

31
Q

what is an example of a second-class lever?

A

nutcracker

wheelbarrow

32
Q

what is an example of a first-class lever?

A

seesaw

33
Q

The maximum speed that a falling object can attain is called its ____.

A

Terminal velocity

34
Q 
Which of the following does not belong with the others?
A) IMA
B) Fout/Fin
C) Wout/Win
D) din/dout
A

C

35
Q

In most cases we want the IMA to be…

A

Greater than 1

36
Q 
Which is not an example of a lever?
A) Pulley
B) Seesaw
C) Wheelbarrow
D) Wedge
E) Broom
A

D

37
Q

For which type of lever is the IMA always less than one?

A

Third class

38
Q

In a simple, frictionless machine…

A

Mechanical efficiency is 100%

39
Q

A device that changes the magnitude or direction of the force or both

A

Machine

40
Q

A system of fixed and movable pulleys

A

Block and tackle system

41
Q

A device that could pivot about a fulcrum

A

Lever

Physics (2 decks)

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