Physics Test Flashcards
What is slope and how do you calculate it?
Slope is the steepness of a line on a graph. You calculate it by rise\sum
How do you know an object is in motion?
An object is in motion if it’s distance from another object is changing
What is acceleration and what are three ways an object can accelerate?
Acceleration is the rate at which velocity changes. Accelerate by increasing speed, decreasing speed, or changing direction
What is the difference between speed and velocity?
Speed is the distance an object travels in a given amount of time. Velocity is speed in a given direction
Speed formula and unit
Distance/time
M/s, km/hr, cm/s
Average speed formula and unit
Total distance/total time
M/s, km/hr, cm/s
Acceleration formula and unit
Time (s) M/s2
Force formula and unit
Mass x acceleration
Kg• m/s2
Momentum formula
Mass x velocity
Kg•m/s
Speed triangle
D
_____
S • T
Balanced force
5N. 5N
——> <——
0N
Unbalanced force
2N. 20N
—–> <——-
Gravity
Gravity is a force that PULLS objects together
Factors that affect gravity and how
Mass and distance
More mass=more gravity
More distance= less gravity
Difference between mass and weight
Mass does not take gravity into consideration while weight does. Weight adds gravity as a factor into weighing
Four types of friction with example
Static: no objects moving
Slide: two solid objects slide over each other
Rolling: object rolls across a surface
Fluid: solid object goes through fluid
Newton’s first law
An object at rest will stay at rest and an object in motion will stay in motion unless acted upon by an outside force
Newton’s second law
Acceleration depends in the mass of an object and the amount of net force acting on it
Newton’s third law
For every action there is an equal but opposite reaction
Inertia
The resistance to change in motion
Air resistance
A force acting against gravity
Net force of a 1,000 kg object accelerating 3 m/s2
3,000 N
What are two ways to increase acceleration of an object
Increase force
Decrease mass
Terminal velocity
Maximum velocity an object can reach
Lighter= faster to reach terminal velocity
