Physics (Newton)

Question 1

4 big kinematic equations

Answer 1

1) vf= at + vi (no distance)
2) Vavg= (XT/t)= (vf + vi/2) (no acceleration)
3) 2aXT= vf^2 - vi^2 (no time)
4) XT= 1/2at^2 + vi*t (no vf)

Question 2

Acceleration

Answer 2

When speed changes

• Uniform acceleration appears as a STRAIGHT LINE on a VELOCITY vs TIME graph.
• uniform acceleration appears as a PARABOLA on a DISTANCE vs TIME graph
• constant speed spears HORIZONTAL on a velocity vs time and STRAIGHT LINE in a DISTANCE vs TIME graph

Question 3

Vectors and Scalars

Answer 3

Vectors: physical quantities where direction is meaningful.
e.g displacement, velocity

Scalars: physical quantities where direction is NOT meaningful.
e.g speed, distance

Question 4

Newton’s First Law: Law of Inertia

Answer 4

Object at rest stays at rest in motion stays in motion at constant velocity unless acted upon by unbalanced forces.

Inertia: mass resists changes when in motion.
- requires work to push.

Balanced forces=> no change in motion
Unbalanced forces=> change in motion

Question 5

Newton’s Second Law

Answer 5

F (net force)= ma
Acceleration proportional to net force
Acceleration NOT proportional to mass

Question 6

Newton’s Third Law

Answer 6

Every action has an equal and opposite reaction

Question 7

Incline planes

Answer 7

FN= mgcos θ
Fg= mgsin θ