P2-Forces Flashcards
Speed=
Distance/time
Scalar means?
Quantities that have size or magnitude only, such as speed, mass and energy
Vector means?
Quantities that have magnitude and direction such as velocity, acceleration, and force
Distance-time graphs
Shows how the distance travelled by an object varies with time
Gradient=?
Speed=distance/time
(On a distance-time graph)
Distance =?
Area under the s-t diagram
Speed time graph
Shows how the speed of an object varies with time
The gradient of a s-t graph=?
The acceleration of the object
The area under a s-t graph=?
The distance travelled
Average speed=?
Total distAnce/total time
Distance=?
(U+v)/2xt
S=
Displacement
U=
Initial velocity
V=
Final velocity
A=
Acceleration
T=
Time
Suvat equations
S=(u+v/2)t
V=u+at
V2=u2+2as
S=ut+1/2at2
Why does the moon orbit the Earth, although the earth and moon have equal forces.
The smaller mass means it has a large acceleration
Newtons 1st law
If there is no resultant force on an object its velocity will not change
Newtons 2nd law
When a resultant force acts on a body, the acceleration produced is proportional to the force and in the same direction
Newtons 3rd law
When an object exerts a force on a second, the second object exerts an equal but opposite force on the first
The resultant force
The sum of all the forces acting on an object
What happens to a skydiver when they dive
As their velocity increases there drag force increases, eventually they equalise and they travel with constant acceleration
OC
Is proportional to
Force =
F=Ma
Mass x acceleration
Momentum =
P=mv
Momentum = mass x velocity
Change in momentum
F= delta p/ time
Work done
Work done = fd
W= force x distance moved
Power=
P=e/t
Power=energy / time
Perpendicular vectors
Have no effect on each other
