VOCABULARY and True/False
T/F -- Centripetal force is always directed towards the _________ of a circle.
True
According to Newton’s second law of motion, force is equal to mass times_________.
Acceleration
A wheelbarrow with a load of bricks is sitting on top of a hill. The total mass of the wheelbarrow is 45kg. The height of the hill is 20m. The wheelbarrow has potential energy. Calculate the amount of energy.
PE = mass x gravity (9.8 m/s2) x height
PE = 45 x 9.8 x 20 = 8,820 Joules
3 trials show lab masses to be 10.4 kg, 10.3 kg, and 10.1 kg. The mass should be 10.2 kg. Are the weights accurate, precise, both, or neither?
Both
T/F -- A theory is an explanation that has been proven accurate through testing and experimentation multiple times.
True
Newton’s 3rd Law states that for every action there is an ___ and ______ reaction.
Equal and Opposite.
Mrs. Wilson runs exactly 4 laps around a 400 meter track. What is her displacement?
0 m
The higher up an object is the more _______________ (2 words) energy it has.
Gravitational Potential
What is the definition of a Hypothesis.
A supposed explanation given before conducting an experiment. Not a Guess but a prediction using IF and THEN.
"An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same velocity unless acted upon by an unbalanced force" describes which law?
Newton's First Law
5
The slope on a speed vs time graph shows _________.
Acceleration
What are the two types of different types.
Kinetic and Potential
According to Kepler's Laws, planets follow elliptical paths with the sun at the ______.
foci.
What is the mass of an object with a force of 10 N and an acceleration of 5 m/s/s?
2 kg
A ball dropped directly vertically off a cliff, with no wind, would have a y-axis or x-axis when calculating its projectile motion?
y-axis
What are the 6 types of energy focused on in class?
Chemical, Electrical, Nuclear, Gravitational, Sound, Light
According to Law of Conservation of Energy, most machines "transfer" their energy unintentionally into what type of energy?
heat energy
In an elastic collision, where kinetic energy and momentum is conserved, what is the momentum if mass is 10 kg and velocity is 2 m/s?
20 kgm/ s^2
In a net force diagram, the opposite force of normal force on earth is ___________ __________.
gravitational force