general knowledge Q&A Flashcards
what is the equation for speed?
distance/time
what is the unit for speed?
m/s
is speed a vector quantity?
yes
does an electron have a positive or negative charge?
Negative charge
Give 2 things that will impact the drivers thinking distance:
- Drugs
- alcohol
Give 2 things that will impact the drivers breaking distance:
- Bad condition of tires
- A slope/bump on the road
what is the equation for acceleration?
acceleration= change in velocity/Change in time
On a velocity time graph where can you find the distance travelled?
Area under the graph for the time interval
what is a vector quantity?
an object that has both magnitude and direction
How many forces normally act on an object?
2 or more
what is the equation linking mass and weight?
w=mg
what can be said about the forces on an object moving at a constant velocity?
The object has 0 acceleration
what decides the kinetic energy particles?
Temperature
What do the parachutist desiderate when they deploy their parachute?
the resultant force will no longer be 0. the air resistance becomes greater than the weight.
which nuclear radiation is least penetrating?
Alpha
What does Newton’s 2nd law state?
if there is a resultant force on an object, that object will accelerate
(f=ma)
What is inertia?
the natural tendency of an object to resist changes in their velocity.
What is the relationship between acceleration and velocity?
acceleration=change in velocity/Change in time
What is inertial mass?
A measure of how difficult it is to change the velocity of an object
equation for resultant force:
RF=ma
State Newton’s 3rd law:
whenever two objects interact, the forces they exert on each other is equal & opposite.
(Friction & reaction and equal & opposite)
Why does a bouncing ball eventually stop bouncing?
Energy is dissipated into the surroundings by heating
What are the action & reaction forces for an object floating on water?
weight is the action force
upthrust is the reaction force
What is the equation for ohm’s law?
V=IR
What is momentum?
An measure of the amount of movement of an object
What is the units for mass?
Kg
what is the units for velocity?
m/s
equation for momentum:
P= m v
units of momentum;
kg m/s
units for acceleration:
meter per second squared
what charge is a proton?
positive
State newton’s first law:
If the resultant for on an object is 0 the object will remain stationary
How do you calculate extension?
extension= length - original length
what is weight?
Force of gravity acting on an object
how many forces act to stretch a spring?
two
How do you calculate stopping distance?
stopping distance= thinking distance + breaking distance
What does the gradient of an
extension-force graph represent?
Spring constant
what type of deformation is for a spring that has exceeded its elastic limit?
Inelastic deformation
What is the elastic limit of an elastic object?
The force at which the force is applied to the elastic object stops being directly proportional to the extension.
what is Hooke’s law?
(equation)
Force= spring constant x extension
f=k e
