Energy
Physics is the study of
science of matter, motion, and energy
What are forces measured in?
Newtons (N)
How are forces represented?
Vector diagrams
Newton’s second law is also known as the law of.....
motion
Forces always come in ....
pairs
What is energy?
Energy is the ability to do work
What is a force?
A force is a push or pull that causes an object to move, stop, or change direction.
What will happen when you kick a soccer ball?
It keeps moving until and unbalanced force stops it
What is acceleration?
How fast something speeds up or slows down.
what is the opposite force to an action force?
reaction
What is energy measured in
Joules (J)
What do unbalanced forces always result in?
A change in motion
An object’s ability to resist changes in its state of motion varies with...
Its mass
What does proportional mean?
If one value changes, a second value changes in the same way
When you fire a gun what is the action and reaction forces?
Action - bullet moving forward
Reaction - gun recoil
What are the 2 main types of energy?
Kinetic and potential energy
Name 1 contact force and 1 non-contact force
Contact force - Friction
Non-contact force - Gravitational Force
What is inertia?
The tendency of an object to resist any changes in motion
true or false - smaller objects are easier to accelerate
True
Describe bouncing on a trampoline in terms of Newtons 3rd law
Action - bouncing down
reaction - bouncing back up
What is the law of conservation of energy?
Energy can not be created non destroyed, energy can only be transferred and transformed.
<-- 100N 88N -->
What is the net force?
12N <---
What is Newtons 1st law?
An object at rest will stay at rest, and object in motion will stay in motion at the same speed and in the same direction unless acted on by an unbalanced force
What is Newtons 2nd law
An objects acceleration is determined by it’s mass and the size of the force applied to it.
What is Newtons 3rd law?
For every action there is an equal and opposite reaction.