Newton's Laws
The first law: "an object in motion will stay in motion unless acted on by an outside force" can also be called the Law of _________
Inertia
Kinetic energy is energy that deals with ______
motion
If the force is equal to 10 N and the mass is 1 kg, what is the acceleration?
10 m/s2
What is energy related to the sun called?
solar energy
How many sig figs are in 10.34?
4
Objects with a greater mass will resist change because they have greater _______
inertia
Potential energy is dependent on what 3 things:
mass
force of gravity
height
A ball starts at 20 m during a period of 10 s, what is the average velocity?
2 m/s
What is the difference between mass and weight?
mass - not dependent on gravity
weight - mass x gravity acceleration
What is a vector?
value with magnitude and direction
acceleration
Velocity is equal to
change in distance / change in time
If a runner has a mass of 20 kg and a velocity of 10 m/s, what is the runner's kinetic energy?
1000 J
answers vary
What is speed?
distance/time with just magnitude
The third law says _____________________
"every action has an equal and opposite reaction"
Momentum is equal to _____
mass x velocity
What is the momentum of a 50 kg person running at a velocity of 20 m/s?
100 kg m/s
Work over change in time
What forces will act on your egg as it drops?
gravity, air resistance, normal force once it hits ground
Action force: Rocket pushes on gas molecules downward.
What is the reaction force?
Gas molecules push up on rocket--- generates thrust
Weight
force of gravity on a given mass
Give me the corresponding units for each term?
velocity
force
energy
acceleration
m/s
N
J
m/s2
change in distance
Which law explains why runners go forward as they push on the ground?
Newton's 3rd law