P1 Flashcards
What is the difference between weight and mass?
Mass is a measure of how much matter an object has. Weight is a measure of how strongly gravity pulls on that matter.
What is the difference between a vector and a scalar quantity?
a scalar quantity is a quantity described by a magnitude only ( e.g 3cm) whereas a vector is a quantity that is described fully by both a magnitude and a direction. e.g 3miles north.
What is the difference between displacement and distance?
Distance is a scalar quantity that refers to “how much ground an object has covered” during its motion. Displacement is a vector quantity that refers to “how far out of place an object is”; it is the object’s overall change in position.
What is the difference between velocity and speed.
velocity is the speed with a direction whereas speed is just the unit with no direction.
Define acceleration.
the rate at which an object changes its speed. It is calculated using the equation:
Acceleration = change in speed ÷ time taken.
Define force.
A force can be a push or a pull.
Define momentum.
the mass of an object multiplied by its velocity.
Define energy.
the capacity of a physical system to perform work.
what is the distance travelled equation?
distance travelled= average speed x time.
what is the acceleration equation?
acceleration= change in velocity/ time taken.
what is the force equation?
force= mass x acceleration.
what is the weight equation?
weight= mass x gravitational strength.
what is the momentum equation?
momentum= mass x velocity
what is the change in gravitational potential energy equation?
change in gravitational potential energy = mass x gravitational strength x change in vertical height.
what is the kinetic energy equation?
kinetic energy= 1/2 x mass x (speed) squared.
what is the efficiency equation?
efficiency=
useful energy transferred by the device.
_____________________
total energy supplied to the device.
what is the wave speed equation?
wave speed= frequency x wavelength.
what is the other wave speed equation?
wave speed= distance
_________
time.
what are the typical speeds for walking, running, cycling and travelling by car?
walking: 3.1 mph
running: 10-15 mph
cycling: 9.6 mph
travelling by car: 2.6 metres per second
what does a greater gradient show you on a acceleration graph?
that there is a greater velocity. and that there i a faster acceleration.
what does a horizontal line show you?
the object is travelling at a steady speed.
how would you work out the acceleration from a distance time graph?
distance travelled
_______________
time
what is the acceleration of free fall?
on earth it is 10 m/s downward.
what is uniform acceleration?
if an object is accelerating at a constant speed.
