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Name the 3 ways an object can accelerate.
speed up, slow down, change direction
How do we calculate speed?
distance divided by time
What unit is used to measure force?
newton
What term refers to the sum of all of the forces acting on an object?
net force
If forces are _______________, no movement occurs.
balanced
Movement results from _________________ forces.
unbalanced
What is a force?
a push or a pull
Which force is pulling toward the center of the Earth?
gravity
Which force pushes in the opposite direction and causes things to slow down?
friction
What is the difference between mass and weight?
mass is the amount of matter in something; weight is a measure of gravity pulling on mass
If David pushes on a wall with a force of 50 n, how hard does the wall push back on him?
50n
Which type of variable is the thing YOU control - the thing you change in each test?
independent variable
Which type of variable is the result - It's the data that you collect?
dependent variable
Which type of variable is kept the same for each test - It's what keeps the test fair?
control variable
Name 3 types of friction.
sliding, static, rolling, fluid
What force is pulling toward the center of the Earth?
gravity
