Units and Measurements
Name 5 units used to measure length.
inches, feet, yards, miles, millimeters, centimeters, meters, kilometers
the equation for velocity=
displacement over time
What diagram do we use to show the forces on an object?
Free body diagram
the equations for momentum is momentum=
mass times velocity
If you drive at 56 km/h for 30 minutes, how far will you travel?
28 km, or 28000 m
What is the distance between vectors and scalars?
A scalar only has a magnitude, a vector has magnitude and direction.
what is acceleration?
a change in velocity
What is inertia?
What is the law of conservation of momentum?
momentum is never created or destroyed, only transferred from one object to another
A car with a velocity of 22 m/s is accelerated uniformly at the rate of 1.6 m/s² for 6.8 s. What is its final velocity?
32.88 m/s
How many seconds are in 1.5 hours?
5400 seconds
what is the difference between displacement and distance?
distance is the length you traveled, displacement is the change in position from your starting point to ending point.
What is newtons 3rd law?
for every action (force) there is an equal and opposite reaction (force)
is momentum a vector or a scalar?
Vector
A plane changes velocity from 75 m/s to 140 m/s in 15s. How far does a plane fly during that time?
1612.5 m
Which of the following are vectors: Time, Force, Temperature, displacement, Velocity
Force, Displacement, Velocity
which motion equation has acceleration, initial velocity, time, and distance?
x=(v_0*t)+(at^2)/2
what is the net force on an object with 400N pushing up and 1700 pulling down?
1300 N down.
what are the units of momentum?
kg*m/s
What is the weight of an 26 kg object on earth?
254.8 N
How many centimeters are in 24 kilometers
2,400,000 cm
what are the units of acceleration?
m/s^2
if the earth is pulling on you with 272 N of force down, what force are you exerting on the earth?
272 N up.
In real life what are some things that cause us to lose momentum?
friction, air resistance, sound, heat
Ball #1 is 6 kg and is rolling 12 m/s directly toward a 12 kg ball #2 at rest. During the collision, ball #1 stops and ball #2 is launched forward. What is the final velocity of ball #2?
6 m/s