RESULTANT FORCES + WORK DONE:
What happens when a resultant force moves an object?
Work is done
RESULTANT FORCES + WORK DONE:
What happens when a force moves an object through a distance?
Energy is transferred an work is done on the object
RESULTANT FORCES + WORK DONE:
What has to happens to make something move (or keep it moving if there are frictional forces)?
a force must be applied
RESULTANT FORCES + WORK DONE:
What does something that is applying a force need?
a source of energy (like fuel or food)
RESULTANT FORCES + WORK DONE:What happens with energy and forces when an object is moved?
the force does work to move the object and energy is transferred from one store to another
RESULTANT FORCES + WORK DONE:
What is work done the same as?
energy transferred
RESULTANT FORCES + WORK DONE:
What are the two types of stores that energy can be transferred to?
- useful storesL energy is transferred usefully (e.g. lifting a load)
- unuseful stores: energy is wasted
you can still say work is done because energy is transferred
RESULTANT FORCES + WORK DONE:
What happens with forces and energy when you push something across a rough surface (like are carpet)?
- you are doing work against frictional forces
- energy is being transferred to the kinetic enrgy store of the object because it starts moving
- some is also transferred to thermal energy stores due to the friction
- this will cause the overall temerature of the object to increase (like rubbing your hands together to warm them up)
RESULTANT FORCES + WORK DONE:
What is the formula for work done?
W = Fs
work done = force * distance
RESULTANT FORCES + WORK DONE:
W = Fs
When working out work done, what units do you need for each value?
work done = joules, J
force = newtons, N
distance (moved along the line of action of the force) = meters, m
RESULTANT FORCES + WORK DONE:
What work is done when a force of 1N causes an object to move a distance of 1m?
1 joule
RESULTANT FORCES + WORK DONE:
You need to be able to convert joules and newton metres:
What is 1J in newton metres?
1Nm
RESULTANT FORCES + WORK DONE:
On earth, what is the weight of an 100g mass?
1N
RESULTANT FORCES + WORK DONE:
On earth, what is the weight of a 1kg mass?
10 N
CONTACT AND NON-CONTACT FORCES:
What type of quantity is a force?
a vector quantity
CONTACT AND NON-CONTACT FORCES:
What are the two types of quantities?
Vector and Scalar
CONTACT AND NON-CONTACT FORCES:
What is the difference between vector and scalar quantities?
Vector quantities have a magnitude and a direction
Scalar quantities only have a magnitude and no direction
CONTACT AND NON-CONTACT FORCES:
Name 5 physical quantities that are vector quantities?
- force
- velocity
- displacement
- acceleration
- momentum
CONTACT AND NON-CONTACT FORCES:
Name 5 physical quantities hat are scalar quantities?
- speed
- distance
- mass
- temperature
- time
CONTACT AND NON-CONTACT FORCES:
How are vector quantities represented?
- by an arrow
- the length of the arrow shows the magnitude
- direction of the arrow shows direction of the quantity
CONTACT AND NON-CONTACT FORCES:
TRUE OR FALSE: Force is a vector quantity?
TRUE
CONTACT AND NON-CONTACT FORCES:
What are the two different types of forces?
contact or non-contact
CONTACT AND NON-CONTACT FORCES:
What is a force?
a push or pull on an object that is caused by it interacting with something
CONTACT AND NON-CONTACT FORCES:
What is a contact force?
When two objects have to be touching for a force to act
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Topic 1 - Energy (1)34
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Topic 1 - Energy (2)31
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Topic 1 - Energy (3)80
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Topic 2-Electricity115
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Topic 4 - Atomic structure70
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Topic 5 - Forces (1)31
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Topic 5 - Forces (2)17
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Topic 5 - Forces (3)47
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Topic 5 - Forces (4)35
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Topic 5 - Forces (5)45
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Topic 5 - Forces (6)38
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Topic 6 - Waves (1)28
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Topic 6 - Waves (2)35
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Topic 6 - Waves (3)42
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Topic 6 - Waves (4)36
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Topic 6 - Waves (5)41
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Topic 7 - Magnetism and Electromagnetism34
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Topic 8 - Space Physics (1)29
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Topic 8 - Space Physics (2)9
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PAPER 1 - past paper mistakes21
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PAPER 2 - past paper errors15
