ch. 2 (motion)
what is the formula for acceleration?
Vf - Vi -------- t
how many laws of motion did Newton make?
3
what is the unit for energy?
joule
a change in an object's position relative to a reference point
motion
it took 500 Newtons to push a car 4 meters. How much work was done?
2000 J
what is the SI unit for momentum?
kg x m/s
what causes friction?
microwelds
name the 3 types of potential energy
chemical, gravitational, and elastic
the ability to cause change
energy
Find the force needed to lift a 3000 Newton weight using a machine with a mechanical advantage of 15.
200 N
on a distance-time graph, where are time and distance graphed?
distance: y-axis time: x-axis
what are the 3 types of friction?
static, sliding, and rolling
what is the difference between efficiency and mechanical advantage?
efficiency is the ratio of output work to input work
mechanical advantage is the ratio of output force to input force
the rate at which energy is conserved
power
Calculate the velocity of a 5kg ball rolling with a Kinetic Energy of 15 J
2.45 m/s
when does a negative acceleration occur?
when an object speeds down
what law is inertia associated with?
newton's 1st law
what are the simple machines that fall under the "inclined plane"
wedge and screw
the rate of change of velocity
acceleration
A girl is pedaling her bicycle at a velocity of 0.10 km/min. How far will she travel in two hours?
12km
what type of speed is shown on a speedometer?
instantaneous speed
name the 4 fundamental forces
gravitational force electromagnetic force strong nuclear force weak nuclear force
what are the four main types of energy?
electrical, chemical, radiant, and thermal
the maximum speed an object will reach when falling through a substance, such as air
terminal velocity
A car starting from rest accelerates at a rate of 8.0 m/s/s. What is its final speed at the end of 4.0 seconds?
32 m/s