Work, Energy and Power

Question 1

Question

Stationary objects require [blank_start]energy[blank_end] to move, change shape or warm up.

Answer

power
energy
heat

Question 2

Question

What is the principle of conservation of energy?

Answer

Energy can be transformed into other forms of energy.
Energy must be conserved.
Energy cannot be created or destroyed.

Question 3

Question

Work Done on an object is equal to the Force multiplied by the Distance moved.

Answer

True
False

Question 4

Question

When work is done on an object, [blank_start]energy[blank_end] is transferred to it.

Answer

energy

Question 5

Question

Work Done has a unit of Joules (J), which is equal to which of the following base units?

Answer

kgm^2s^-2
Nm
kgms^-2
kgm^-3

Question 6

Question

The [blank_start]greater[blank_end] the force, or the [blank_start]further[blank_end] the distance, the greater the work done on an object.

Answer

greater
lesser
shorter
further

Question 7

Question

No work is done on an object when Force and Distance/Displacement are...

Answer

of equal size.
at an angle of 30 degrees.
at right angles to each other.

Question 8

Question

The area underneath a Force-Distance graph represents the acceleration of the object.

Answer

True
False

Question 9

Question

Which of the following apply for a string being stretched?

Answer

The distance moved by the spring is the extension.
Energy is lost during stretching.
Are under a Force-Distance graph for a stretched spring is equal to the energy stored in the spring.
Energy stored in a spring = Force x Distance.
Energy stored in a spring = 1/2 x Force x Extension/Change in length.
A stretched spring obeys Newton's 3rd Law.
A stretched spring obeys Hooke's Law, which states that Force is directly proportional to the extension of the spring.

Question 10

Question

Kinetic Energy = 1/2 x mass x velocity^2

Answer

True
False

Question 11

Question

The slower an object moves, the more kinetic energy it has.

Answer

True
False

Question 12

Question

Acceleration due to gravity is 10ms^-2.

Answer

True
False

Question 13

Question

Which of the following is true?

Answer

potential energy = mass x acceleration due to gravity
mgh = 1/2mv^2
Work done on an object decreases the gravitational potential energy of the object.

Question 14

Question

When considering a pendulum bob - is it true that the bob passes its equilibrium position with maximum speed, and then slows down when it reaches its maximum height. Meaning that the kinetic energy is equal to the loss of potential energy from its maximum height.

Answer

True
False

Question 15

Question

Power is the [blank_start]rate of transfer of energy[blank_end].

Answer

rate of transfer of energy
time per Joule
time work takes to be done

Question 16

Question

Energy can be transferred from one object to another by the means of: - work done -heat transfer -electricity -sound waves -electromagnetic radiation

Answer

True
False

Question 17

Question

Which of the following apply for engine power:

Answer

Power = Force x Velocity
Obeys Newton's 2nd Law.
Resistive forces are equal and opposite to the motive force.

Question 18

Question

Useful power output = Total power supplied/Useful power

Answer

True
False

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Work, Energy and Power

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Question 1

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	Created by Elliephant Brown almost 8 years ago