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Forces - Forces and Energy
The units used for power are watts.

Forces - Forces and Energy

This GCSE Physics quiz takes a look at forces and energy. From the largest structures in the universe to the microscopic world of the atom, forces play a part in every interaction. Sometimes the forces are very obvious and you can feel their effects, for example gravity or the wind blowing. Other times these forces are less obvious like the forces that hold chemical elements together to form compounds or the reaction force that a table exerts on a book that is placed on it.

When a force is applied to an object and causes it to move, energy is transferred to the object and work is done. In everyday language, work means a lot of different things but in physics it means only one thing - a force has made something move.

What is transferred when work is done?
The joule denotes a unit of energy and is used to describe various types of energy-related values including work done
What is work done?
The amount of energy transferred to an object that is being moved
The amount of energy transferred to an object at rest
The force needed to move an object
The distance an object can be moved
The definition of work in physics is very specific
What is the formula for work done?
W = dF
W = Fd
F = W x d
W = F x d
If a force does not move, then no work is done
What is the gravitational potential energy of a ball of mass 100 g which is at a height of 1 m above the Earth? (Note: The gravitational strength of the Earth is 9.81 N/Kg.)
1000 J
1 J
0.1 J
1 N
Remember mass is measured in kg and so you need to convert the 100 g into 0.1 kg before you multiply by g and h
What is the time taken to move an object if the total power used is 100 W and the energy transferred by a force to the object is 1,000 J?
10 seconds
100 seconds
1,000 seconds
0.1 seconds
Make sure that you are able to rearrange equations
What are the units used for work done?
When the force is measured in newtons and the distance in metres, the work done will be calculated in joules
What is the formula for power?
P = Wt
P = tW
P = W x t
W = Pt
Since power is the rate of transfer of energy, you can eliminate two of the options immediately
What is gravitational potential energy?
The energy an object has due to its position within a gravitational field
The strength of the gravitational field at the centre
The speed of an object due to the force of gravity
The energy an object radiates to other objects within a gravitational field
The amount of gravitational potential energy depends on the position of the object and its mass in a given strength of gravitational field
What are the units used for power?
The watt is names after James Watt, a Scottish inventor who invented an efficient type of steam engine
What is the formula for gravitational potential energy?
GPE = m x hg
GPE = h x mg
GPE = g x hm
GPE = m x g x h
The gravitational potential energy of an object is related to its mass, the strength of the gravitational field and the object's distance from the centre of the gravitational field. In practical terms, on Earth, h is measured from the ground and often at GCSE level, this equation is used to calculate energy changes due to changes in height
You can find more about this topic by visiting BBC Bitesize - Work and energy

Author:  Martin Moore

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