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Physics I - Friction, Work, and Energy

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Section 1

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What is the equation for work?

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Date created

Mar 1, 2020

Cards (25)

Section 1

(25 cards)

What is the equation for work?

Front

W=Fdsin(θ)

Back

T/F An increase of surface area will increase the kinetic friction value exerted upon an object

Front

F

Back

What is the work-energy theorem related to in the first law of thermodynamics?

Front

∆U = Q - W

Back

If the speed of an object doubles, how will the kinetic energy change?

Front

It will QUADRUPLE since there is a direct, squared relationship between the two variables.

Back

Differentiate between work and energy. What is the SI unit for work?

Front

Work is the application of MECHANICAL energy from one system to another The unit is the joule (J) Heat is the transfer of THERMAL energy

Back

Tripling the height of an object will cause the gravitational potential energy of an object to do what?

Front

Triple, as there is a direct relationship between these factors

Back

What is the SI unit for force? What are the fundamental units of this unit?

Front

The Newton (N) (kg * m)/s²

Back

If a crane must lift a block 3 m off the ground, how will two ropes holding the block in equilibrium shorten through the use of a pulley system?

Front

Both sides must shorten by 3 m, which is done through pulling 6 m of rope through the pulley.

Back

The elastic potential energy of a spring relies, primarily, on what two factors?

Front

The spring constant and the equilibrium length (distance pulled)

Back

Differentiate between conservative and non-conservative forces in dissipating and conserving mechanical energy.

Front

Conservative forces like gravitational and electrostatic will ALWAYS conserve mechanical energy (i.e., ∆E=0) while non-conservative such as friction will transform the energy into another form of energy such as heat.

Back

T/F A positive value for work means a system did work on another system.

Front

T

Back

Potential energy has the potential to do what?

Front

It has the potential to do work

Back

Differentiate between static and kinetic friction.

Front

Static friction is exerted upon an object when it is at rest while kinetic friction is exerted when an object is moving across a surface

Back

An ineffective simple machine should have a mechanical advantage of what?

Front

1

Back

When a gas expands, would work be positive or negative?

Front

It would be positive, as the gas would be doing work on another system (and thus non-spontaneous)

Back

What is power? What is the unit for power?

Front

Power is the rate at which energy is transferred from one system to another. The watt, which is J/s.

Back

What, in general, does the work-energy theorem state?

Front

This states that the net work done by the system and all forces acting upon the object will equal the change in kinetic energy of the system

Back

In order for simple machines to achieve a given value of work or energy transference, what occurs, in general?

Front

A reduction of necessary force at the COST of increased distance this force must be applied though!

Back

If the distance between two objects is reduced by 0.5, how will the gravitational force exerted between the two objects change?

Front

Since there is an inverse square relationship, the gravitational force will be quadrupled

Back

When a gas compresses, would work be positive or negative?

Front

It would be negative, as the gas would have work being done on it (and thus spontaneous).

Back

How do the values of kinetic and static friction differ?

Front

Kinetic is ALWAYS constant and is less than the value for static

Back

What are the fundamental units of a watt (W)?

Front

J/s = W

Back

T/F A simple machine decreases the net work produced upon an object.

Front

F A simple machine only decreases the amount of force needed while increasing the distance through which this force must be applied.

Back

What is the equation for weight of an object?

Front

F=m*g

Back

Total mechanical energy relies on what two variables?

Front

The total potential energy and the total kinetic energy

Back