Vocab
The change in an objects velocity over time.
Acceleration
What is the formula for speed?
Speed = distance/time or v=d/t
v = 30 mi/.5 h=60 mi/h
Which of the following quantities could represent a velocity?
a.10 mi/h
b. 25 m east
c. 74 mi/min west
d. 100 km/h and slowing
c. 74 mi/mi west
What is the difference between Scalar and Vector quantity?
They both have magnitude (number) but vector has directional information as well.
The motion of an object when it is falling solely under the influence of gravity (without air resistance)
Net Force = mass x acceleration F = M x A
21.6 m
If you push on a wall with 10 N of force toward the south, what force (and in what direction) does the wall exert on you?
a. 10 N North c. 10 N South
b. 5 N North d. 0 N North
a. 10 N North
What is the tendency of an object to resist changes in its velocity.
Inertia
What is friction that opposes the initiation of motion
static friction
What is the formula for weight
weight = mass x acceleration due to gravity, w = m x g
A student walks around the block, returning to her house. It took her 20 minutes to complete her walk, which covered a distance of 1/2 mile. What is her total displacement?
0 because the staring and ending points are the same.
Which universal force in creatin is the strongest?
a. electromagnetic force
b. gravitational force
c. strong nuclear force
d. weak nuclear force
c. strong nuclear force
Is the observation the ball is red in color qualitative or quantitative?
Qualitative
The distance an object travels plus the direct from the starting point
Displacement
What is the formula for acceleration
acceleration = final velocity-initial velocity/time
What is the speed in miles per hour of a car that made a 40 mile trip in 30 minutes?
80 mi/hour
Which measurement requires a direction, speed or velocity?
Velocity
(True/False) A pure substance has a fixed composition.
True
A chemical reaction in which two or more substances react to form a single compound
synthesis reaction
What is the formula for relative speed for objects traveling in the same direction?
relative speed = speed of object 1 - speed of object 2
A car traveled 84 km in 1 hour and 92 km in the next hour. What was the car's average speed in kilometers per hour?
88 km/h
What must an electron do to move from the third energy level to the second energy level?
a. it has to absorb energy
b. it has to release energy
c. it has to bump into another electron
b. it has to release energy
Which phase of water is denser: solid or liquid?
liquid