Chapter 1 - Forces Flashcards
1
Q
What is a force?
A
A push or pull
2
Q
Give an example of unbalanced forces
A
Rocket taking off, because the upthrust us greater than gravity
3
Q
What is a force measured in?
A
Newtons
4
Q
Give an example of when friction is useful
A
On car tyres so it can grip the ground
5
Q
Give an example when friction isn’t useful
A
On the outside of a plane, because you don’t want the air slowing you down
6
Q
What is Hooke’s law?
A
A law stating that the strain in a solid is proportional to the applied stress within the elastic limit of that solid.
7
Q
What is friction and what can it do when it occurs?
A
It can generate heat and cause things to move or stop
