Force and motion
What is the unit of weight
Newtons (N)
What is the unit for work
Joules
What is the law of conservation of energy
Energy cannot be created nor destroyed
What is the difference between the reactant and the product
The reactants are the atoms or molecules that are reacting while the products are the molecules formed from the chemical reaction
What is formula for density
Density= Mass/Volume
What is the difference between acceleration and velocity
Velocity is how quickly an object is moving in a direction, while acceleration is a measure of how quickly the velocity is changing
Name one simple machine
Wheel and axel, pulley, lever, wedge inclined plane and screw
In food digestion, chemical energy is converted into what type of energy
Kinetic energy
In the equation N2 +3H2 = 2NH3 Is N2 the reactant or the product?
It is the reactant
When matter is heated what happens to the particles inside it?
The particles gain kinetic energy and collide more frequently
Does friction force act against motion or with it?
Against motion
What is the difference between simple machines and complex machines
Complex machines are made up of simple machines while simple machines are not
Name one type of potential energy
Gravitational, elastic and chemical
What is this reaction known as: AB= A+B
decomposition reaction
What is the difference between a homogenous mixture and heterogenous mixture
In a homogenous mixture the components are evenly distributed while in a homogenous mixture they are not evenly distributed
What is newton’s first law also known as?
The law of inertia
What is mechanical advantage
Mechanical advantage is a measure of how much easier a machine can do work
Name one renewable energy source
Hydropower, solar power, wind power etc.
How do you make sure that a chemical reaction is balanced?
There are the same number of atoms on both sides of the equation
What is the solute in salt water
The salt is the solute because it is the substance dissolved in the water which is the solvent
What is the formula for momentum
P=m/v
P= momentum
M=Mass
V= Velocity
A machine has an input force of 3000N and an output force of 9000N. What is the mechanical advantage
9000N divided by 3000N is 3000N
If you are going to drop a ball from a 20 feet building, would the ball have a high gravitational potential energy or high kinetic energy?
High gravitational potential energy
What does the subscript of a reactant or product in a chemical equation tell you?
How many atoms there are within a molecule or compound
What is the difference between a compound and a mixture
In a compound the substances are chemically bonded while in a mixture they are not chemically bonded