UNIT 1
A person walks 12 miles in 3.0 hours.
What is the average speed of the person during this time?
4.0 miles per hour
A boat has a mass of 54,000 kg. The boat is accelerating at 0.4 m/s2. What is the net force acting on the boat?
135,000 N
What kind of wave is a microwave?
an electromagnetic wave
Rank the different states of matter in reference to highest energy per particle to lowest.
solids > liquids > gases
What particle is the smallest unit of matter that has the chemical properties of an element?
an atom
What term is defined as the distance and direction of an object’s change in position from its starting point?
displacement
What is the term for a force that is not canceled out by other forces?
a balenced forces
What is the mechanical energy of an object?
the sum of its potential and kinetic energy
what are the physical properties of matter?
1.solubility
2. boiling point
What is the name of a substance that is made of only one type of atom and that cannot be made into a simpler substance?
element
A train is moving with a velocity of 70 km/h.
If north is taken as the positive direction, what is the direction of movement of the train?
It is moving north but is speeding up.
A catapult is a device that throws heavy stones. The stone sits in a basket at the end of an arm. The arm moves fast, and the stone is launched toward the target.
What type of force does the catapult apply to the stone?
a newton force
A space shuttle is sitting stationary at the launch pad.
What is the kinetic and potential energy of the shuttle?
potential energy: low
kinetic energy: zero
How is density calculated?
by dividing mass by volume
Which scientist contributed to the periodic table by ordering the elements according to their average atomic mass?
Mendeleev
What phrase is defined as distance over time for a given period?
average distance
A toy train has a mass of 1.5 kg. A force of 3.0 N is acting on the train. What is the acceleration of the train?
0.5 m/s2
Which variables affect potential energy?
mass and position or arrangement
What can be measured or observed without changing the chemical identity of the substance?
physical properties
What is the term for a combination of two or more different substances that do not chemically react with each other?
a mixture
Which fields of science did Galileo work in?
astronomy
If F1 has a magnitude of 7 N and F2 has a magnitude of 11 N, what is the net force acting on the box?
4 N forward
A car applies a force of 20,000 N downward towards the street.
How much force does the street apply on the car?
less than 20,000 N
Some hot liquid oil on a frying pan gradually cools down.
What kind of change happens as the oil cools?
Its temperature decreases.
Which type of substance is made up of at least two different chemically combined elements?
a compound