Define mechanical work done .

Work done is the product of the force applied to an object and the distance over which the force is applied, measured in joules (J).

True or False? Work is done when a force is applied to an object, regardless of whether the object moves or not.

False. Work is done when a force is applied to an object and results in the object's movement over a distance in the direction of the force.

True or False? Work can only be done mechanically.

False. Work can also be done electrically, by heating or by radiation.

True or False? The amount of energy transferred is equal to the work done.

True. The amount of energy transferred (in joules) is equal to the work done (in joules) when any mechanical work is done.

True or False? Work is done on a ball when it is lifted to a height.

True. Work is done on a ball when it is lifted to a height.

Define gravitational potential energy .

Gravitational potential energy is the energy transferred to an object due to its change in height in a gravitational field.

True or False? Energy is transferred away from an object's gravitational potential store when it is lifted.

False. Energy is transferred to an object's gravitational potential store when it is lifted.

True or False? Gravitational potential energy is measured in units of newtons per kilogram (N/kg).

False. Gravitational potential energy is measured in units of joules (J).

True or False? Energy is transferred to an object's gravitational potential store when it falls.

False. Energy is transferred away from an object's gravitational potential store when it falls.

Define kinetic energy .

Kinetic energy is the amount of energy an object has as a result of its mass and speed.

True or False? Any object in motion has energy in its kinetic energy store.

True. Any object in motion possesses kinetic energy.

True or False? Kinetic energy is measured in units of joules per second.

False. Kinetic energy is measured in units of joules (J).

True or False? Energy transfers can be assumed to be perfect (100% efficient) if the wasted energy is negligible.

True. Energy transfers can be assumed to be perfect (100% efficient) if the wasted energy is negligible.

Power is the rate at which energy is transferred or work is done, measured in watts (W).

True or False? Power is the total amount of energy transferred.

False. Power refers to the rate at which energy is transferred or work is done, not the total amount of energy transferred.

True or False? A car has more power if it does the same amount of work in a longer amount of time.

False. A car has more power if it does the same amount of work in a shorter amount of time.

Define the rate of doing work .

The rate of doing work, or power, refers to the amount of work done or energy transferred per unit time. It is measured in watts (W).

True or False? Power and work done are the same quantities.

False. Power is the rate at which energy is transferred or work is done, work done is the total amount of energy transferred.

True or False? Power is often measured in joules (J).

False. Power is typically measured in watts (W), while energy is measured in joules (J).

IGCSEScienceEdexcelScience (Double Award)PhysicsFlashcards4. Energy Resources & Energy TransfersWork, Power & Energy Resources

Work, Power & Energy Resources (Edexcel IGCSE Science (Double Award): Physics): Flashcards

Exam code: 4SD0

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FrontWork Done
Define mechanical work done.
FrontWork Done
What is the formula for calculating work done?
BackWork Done
The formula for calculating work done is $W = F \times d$
Where:
$W$ = work done, measured in joules (J)
$F$ = force, measured in newtons (N)
$d$ = distance, measured in metres (m)

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Cards in this collection (30)

Define mechanical work done.
Work done is the product of the force applied to an object and the distance over which the force is applied, measured in joules (J).
True or False?
Work is done when a force is applied to an object, regardless of whether the object moves or not.
False.
Work is done when a force is applied to an object and results in the object's movement over a distance in the direction of the force.
What is the formula for calculating work done?
The formula for calculating work done is $W = F \times d$
Where:
- $W$ = work done, measured in joules (J)
- $F$ = force, measured in newtons (N)
- $d$ = distance, measured in metres (m)
True or False?
Work can only be done mechanically.
False.
Work can also be done electrically, by heating or by radiation.
True or False?
The amount of energy transferred is equal to the work done.
True.
The amount of energy transferred (in joules) is equal to the work done (in joules) when any mechanical work is done.
State the relationship between energy transferred and work done.
The relationship between energy transferred and work done is:
$energy transferred (J) = work done (J)$
True or False?
Work is done on a ball when it is lifted to a height.
True.
Work is done on a ball when it is lifted to a height.
Define gravitational potential energy.
Gravitational potential energy is the energy transferred to an object due to its change in height in a gravitational field.
True or False?
Energy is transferred away from an object's gravitational potential store when it is lifted.
False.
Energy is transferred to an object's gravitational potential store when it is lifted.
True or False?
Gravitational potential energy is measured in units of newtons per kilogram (N/kg).
False.
Gravitational potential energy is measured in units of joules (J).
What does the term $m$ represent in the gravitational potential energy equation?
In the gravitational potential energy equation, $m$ represents the mass of the object in kilograms (kg).
What is the equation for calculating gravitational potential energy?
The equation for calculating gravitational potential energy is $G P E = m g h$
Where:
- $G P E$ = change in gravitational potential energy
- $m$ = mass, measured in kilograms (kg)
- $g$ = gravitational field strength, measured in newtons per kilogram (N/kg)
- $h$ = height, measured in metres (m)
Define $g$ in terms of the gravitational potential energy equation.
In the gravitational potential energy equation, $g$ represents the gravitational field strength in newtons per kilogram (N/kg).
True or False?
Energy is transferred to an object's gravitational potential store when it falls.
False.
Energy is transferred away from an object's gravitational potential store when it falls.
Define kinetic energy.
Kinetic energy is the amount of energy an object has as a result of its mass and speed.
True or False?
Any object in motion has energy in its kinetic energy store.
True.
Any object in motion possesses kinetic energy.
What is the equation for calculating kinetic energy?
The equation for calculating kinetic energy is $K E = \frac{1}{2} m v^{2}$
Where:
- $K E$ = kinetic energy, measured in joules (J)
- $m$ = mass, measured in kilograms (kg)
- $v$ = velocity, measured in metres per second (m/s)
True or False?
Kinetic energy is measured in units of joules per second.
False.
Kinetic energy is measured in units of joules (J).
What does the term $v$ represent in the kinetic energy equation?
In the kinetic energy equation, $v$ represents the speed of the object in meters per second (m/s).
Define the term $m$ in the kinetic energy equation.
In the kinetic energy equation, $m$ represents the mass of the object in kilograms (kg).
An object has a mass of 2 kg and a velocity of 5 m/s. What is the kinetic energy of the object?
If an object has a mass of 2 kg and a velocity of 5 m/s, then it has 25 J of kinetic energy.
- $K E = \frac{1}{2} m v^{2}$
- $K E = \frac{1}{2} \times 2 \times 5^{2} = 25 J$
True or False?
Energy transfers can be assumed to be perfect (100% efficient) if the wasted energy is negligible.
True.
Energy transfers can be assumed to be perfect (100% efficient) if the wasted energy is negligible.
True or False?
The energy transfers in a pendulum can be equated as $K E_{t o t a l} = G P E_{t o t a l}$ .
True.
The energy transfers in a pendulum can be equated as $K E_{t o t a l} = G P E_{t o t a l}$ .
This kind of energy equivalence is used in lots of calculations involving kinetic and gravitational potential energy.
Define power.
Power is the rate at which energy is transferred or work is done, measured in watts (W).
True or False?
Power is the total amount of energy transferred.
False.
Power refers to the rate at which energy is transferred or work is done, not the total amount of energy transferred.
True or False?
A car has more power if it does the same amount of work in a longer amount of time.
False.
A car has more power if it does the same amount of work in a shorter amount of time.
What is the formula for calculating power?
The formula for calculating power is: $P = \frac{W}{t}$
Where:
- $P$ = power, measured in watts (W)
- $W$ = work done, measured in joules (J)
- $t$ = time, measured in seconds (s)
Define the rate of doing work.
The rate of doing work, or power, refers to the amount of work done or energy transferred per unit time. It is measured in watts (W).
True or False?
Power and work done are the same quantities.
False.
Power is the rate at which energy is transferred or work is done, work done is the total amount of energy transferred.
True or False?
Power is often measured in joules (J).
False.
Power is typically measured in watts (W), while energy is measured in joules (J).

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