Forces Flashcards
(23 cards)
Forces can be a….. or a ……
Push or pull
Name four contact forces
Friction,upthrust, air/water resistance, reaction force
Which piece of equipment do you measure forces with
Newton metre
What unit do we measure force in
N (newton)
What is the name of the support from a solid object
Reaction force
When you apply a force to the solid what happens to the bonds in the solids
They get compressed
What does the word extension mean when describing an electric material
How far the material stretches
What is the elastic limit of a material
Where the material stretches so far it can’t go back to its original length
What is the name of the pull force within a stretched spring or elastic material
Tension
Which force resistance movement when two materials are in contact
Friction
Give 2 examples of when friction is useful
Walking braking writing on paper sandpapering
How can you reduce the friction between 2 surfaces
Lubrication eg oil wax grease water
Water and air resistance are both part of what force
Drag
Why is it harder to run through water than on land
It means you have to push more particles out the way because water is more dense than air
How are sports cars and many marine animals adapted to reduce drag in water
They are streamlined
Why does a parachute help a skydiver increase drag in the air
It has larger surface area to hit more particles to slow them down
What do we call the area around an object in which the efffect of non contact forces are felt
A field
As you get further away from a force field what happens to the strength of the force
It gets weaker
What is the difference between mass and weight
Mass is how much matter/atoms/stuff an object is made from. Weight is the force due to gravity has pulling the object’s mass
What is the name of the single force which represents the combined effect of all the forces acting on the object
Resultant force
If 2 forces acting on the object in opposite directions are the same size what would happen to the object
Either not move or move at a constant speed
What do we call an object that has equal sized pairs of forces acting upon it
In equilibrium
If 2 forces acting on an object in opposite directions and are not the same size what would happen to the object
It would change speed: accelerate/ speed up or decelerate/ slow down
