Motion, Forces And Energy Flashcards
What is the speed of light
3x10^8
What do you put on the x axis
The independent/input variable
What do you put on the y axis
The dependant/output variable
How can we ensure an accurate experiment result (3)
By taking a bigger sample size
Repeating the experiments more than 3 times and calculating an average
How can we measure the volume of a liquid
A measuring cylinder
How can we find the volume of a solid
By part filling a cylinder and noting the volume, then submerge a solid and not the new volume. The change in volume is the volume of the solid
How do you calculate the time for one oscillation
Total oscillations/number of oscillations
How do you calculate the thickness of a sheet of paper
Total thickness/number of sheets
What are scalars
Physical quantities with only magnitude
What are vectors
Quantities that have both magnitude and direction
What is momentum
An object’s resistance to stopping
What is the formula for momentum
p=mv
Is momentum a scalar or vector quantity
Vector
What is the SI unit for momentum
Kg m/s
What is impulse
Measure in change of momentum
What is force in relation to momentum
Give the formula
The rate of change of momentum
F=change in momentum/change in time
How does an airbag save lives
How does an airbag save lives
Can’t change impulse in car crash, but because airbag deflates upon impact, it increases the time for the momentum to be transferred and reduces the overall force on your body Can’t change impulse in car crash, but because airbag deflates upon impact, it increases the time for the momentum to be transferred and reduces the overall force on your body
What is the principle of conservation of linear momentum
When objects of a system interact, their total momentum before and after interaction are equal unless a net force acts upon the system
What is the principle of conservation of momentum
Total momentum of an isolated system in constant
What is the formula for the momentum of 2 objects that remain separate after collision
m1u1+m2u2=m1v1+m2u2
What is the formula for 2 objects that joined or liked up after interaction
m1u1+m2u2=(m1+m2)v
What happens to the velocity of 2 objects if they join during an interaction
They become equal
What happens to the total momentum during a collision
It is conserved
What happens to the masses of objects that join during an interaction
They combine
What are 2 very important rule to remember when calculating momentum
If moving in opposite directions, one velocity must be negative
You must state the direction of the object/s after interaction
What is the formula for kinetic energy
1/2mv^2
What is the formula for gpe
mgh
What 3 sources of energy do not come from the sun
Tidal
Geothermal
Nuclear
What is the turning effect of a force known as
A moment
When will the average and instantaneous velocity be the same
In the middle of the time
What is terminal velocity
The highest velocity attainable by an object falling through a fluid such as air or oil. It occurs when all the forces acting upon the object are equal. It has 0 acceleration
What is it called when an object undergoes an acceleration caused by gravity
Free fall
What is free-fall
Any motion of a body when gravity is the only force actung upon it
What is inertia
The tendency of an object to resist changes in motion
What is mass
The amount of matter in a body/measure of inertia in a body
It is dependant on the number if and the arrangements of atoms
It has a constant magnitude
What can be used to measure mass
Beam balance
Calibrated electronic balance
What is weight
The amount of gravitational force acting upon a body
Acts towards the centre of the earth
Depends on gravitational field strength
What can be used to measure weight
Scale balance
Calibrated electronic balance
Give an alternate way to measure the volume of an irregular object
Completely fill a eureka with water, measure what volume flowed over after the object was placed in
When will an object sink in water
When it has a density of higher than 1g/cm3
What may be caused by a force
A change in size,shape or motion of an object