Forces, Types Of Forces, Density And Volume Flashcards
A force may be ?
A push
Pull
Twist
Turn
The effects of a force are?
It changes shape
Direction
Speed
What is mass
Mass is the amount of matter in an object
What is mass measured in
Grams (g) or kilograms (kg)
What is weight
Weight is the force due to gravity attracting an object
What’s weight measured in and with what
It’s measured with a Newton meter and the unit are newtons (N)
Mass never changes but what does
Weight
What’s air resistance
Air resistance is an opposing force created when an object moves through the air
What’s gravity
Gravity is the force that causes objects to be pulled towards the ground
What’s friction
It’s the force that always goes against moving objects
What’s upthrust
It’s the force that causes objects to float in a liquid
What’s push/pull
It’s the force when an object is pushed forwards or backwards
If forces in an object are balanced, what happens to the object?
It remains stationary or is moving at the same speed
If forces on an object are unbalanced, what happens to the object?
The object will change speed, shape or direction
Dive toys sank to the bottom of the swimming pool, explain why the toys have sunk
Weight is more than upthrust, so the objects sink
What materials float and sink out of all these objects
Wood
Polystyrene
Wax
Aluminium
Iron
Glass
Perspex
Wood, polystyrene and wax float
Aluminium, iron, glass and Perspex sink
What’s it called when u read the volume with your eye in line with the water level
Meniscus
What can volumes of liquids be measured in
Cm3
Litres (L)
Millilitres (ml)
How can we measure the volume of a shape that’s irregular
Measure water in a measuring cylinder up to 20cm3
Put the irregular shape in it
See how much it rises (25cm3)
Subtract it from when there wasn’t any thing in the water
Answer is (5cm3)
How do find the density of a material
Density = mass divided by volume
How do u determine which materials float or sink
It their density is less than 1g/cm3, it floats and if it’s more than 1g/cm3, it sinks
How do u find the volume
Final volume - initial volume
Mass divided by density
How do u find the mass
Mass = density x volume
What’s the overall force called
Resultant force
