1: FORCES

Question 1

contact vs non contact forces and what a force is

Answer 1

a force is any push or pull
contact: objects are physically touching eg normal reaction force, friction, air resistance
non contact: not touching, eg electrostatic, magnetism, gravity

Question 2

scalar vs vector

Answer 2

scalar: only magnitude eg distance, speed, mass
vector: magnitude and direction eg displacement, velocity, acceleration

Question 3

what if forces are balanced

Answer 3

constant velocity, no acceleration or stationary

Question 4

what is work done

Answer 4

energy transferred by a force

Question 5

spring practical (5)

Answer 5

1. add masses onto spring to change total force
2. measure extension with ruler at each weight, plot F against E
3. gradient of graph = spring constant
4. avoid systematic error by lining up 0cm with bottom of spring
5. avoid parallax error by being at eye level when measuring