Forces Flashcards
What are forces measured in?
Newtons (N)
What is a force?
Anything that causes an object to change it’s soeed or direction
Name 6 examples of force
push, pull, friction, magnetic, gravity, weight
How are forces measured?
using a spring balance
Draw a diagram of a spring balance.
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when does friction occur?
when two surfaces rub together
Name a function of friction
to slow down moving objects, cause wear and tear of materials and cause things to use more energy to move.
What affects how much friction there is?
how rough the surfaces are
how can friction be reduced?
by adding a lubricant e.g. oil, grease
Name 2 advantages of friction
> Friction between our shoes and the ground stops our feet slipping backwards and allows us to walk.
Friction between car tyres and the road stops the car skidding and allows cars and bikes to move.
Name two disadvantages of friction
> Slows down objects so more energy is used for movement.
> Causes wear and tear of materials.
Write down the friction experiment
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What is weight?
The weight of an object on the earth is the force of attraction between the earth and the object.
What is weight measured in?
Weight is a force and so is measure in Newton
Weight is a ________
force
How do you find the weight of an object?
the force formula
Weight = Mass (in kilograms) x Acceleration due to gravity (10)
Write out the formula for weight
Weight = Mass (in kilograms) x Acceleration due to gravity (10)
what changes what the acceleration different objects het from the earth?
Nothing
The acceleration that an object gets from the earth is the same for all objects and is approximately 10m/s2.
what is the acceleration different objects get from the earth?
10m/s2
give an example of changing mass into weight
Eg A bag of flour has a mass of 500g.
The weight of the flour = mass in kilograms x 10 (acceleration on the earth due to gravity)
= 0.5x10=5N
If a bag of flour has a mass of 500g convert it to force
The weight of the flour = mass in kilograms x 10 (acceleration on the earth due to gravity)
= 0.5x10=5N
Name three differences between mass and weight
MASS l. Measured in kilograms (kg) 2. Is fixed, never changes. 3. Is a fixed feature of all things- like length or volume. WEIGHT 1. Measured in newtons (N) 2. Varies, depends on where you are. 3. Is a force or pull on something.
what is hooke’s law
HOOKES LAW:
Hooke’s Law states that the extension of a spring is proportional to the weight attached to it.
what does it mean if something is directly proportional to something else
If two quantities are in direct proportion, as one increases/decreases, the other increases/decreases by the same percentage.
if two things are directly proportional what would a graph look like
a straight line graph through 0,0
write hookes law experiment
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