Newton's Law
Newton's 1st Law is called the Law of ____________?
The Law of Inertia
Acceleration due to gravity at Earth's surface
9.8 m/s2
This is the unit of force
What are Newtons?
This is the definition of Kinetic energy
This is where an object has its highest potential energy and lowest kinetic energy
What is its maximum height?
What is Inertia?
An object's resistance to change it's state of motion
Equation for gravitational potential energy
Ug=mgh
This is the unit that work done is measured in
What are joules?
This is the equation for potential energy
What is Ep = mgh?
This is why in practice the kinetic energy may be slightly lower than the potential energy
What is some energy is wasted?
A person skydiving will fall down towards the Earth because of which force?
Gravitational
A 10 kg box is being pushed across a floor with a coefficient of kinetic friction of 0.3. What is the force of kinetic friction acting on the box?
29.4 N
This is what work done is a measure of
These are the two factors that affect kinetic energy
What are mass and velocity?
This is how the amount of energy in the universe has changed since the beginning of time
What is its the same / it hasn't changed?
Newton's 3rd Law of the called the Law of _____________ and ___________________
The Law of Action and Reaction
(2 minutes) If four students push a desk across the room with friction of 25 N, a mass of 160kgs, and travel at an acceleration of 0.5 m/s^2, what is their Net force?
55 N
These are the two factors that affect work done
This is why an object stores potential energy when it has been raised
What is work has been done on the object?
These two energies can be equated due to conservation of energy
What are kinetic and potential energy?
If I throw a ball in space, will it keep going forever?
Yes! Because it will need something to FORCE it to stop
A rock with a mass of 2kg is dropped from a height of 10 meters near Earth's surface. Air resistance is negligible. What is the gravitational force acting on the rock?
19.6N
This is the work done on a go-kart travelling with a force of 250N for 1km
What is 250000J
This factor has the most impact on kinetic energy
What is velocity?
This equation can be used to calculate the speed of an object when it hits the ground using its height and the gravitational field strength
What is v = √(2gh)?