Force
____ objects have more inertia than ____ objects.
The slope of a distance/time graph tells you...
Speed
If the object does not _______, no work is done.
Move a distance!
Name the two things you need to know to figure out an object's speed.
What are distance and time?
Use this simple machine to cut, split, or push apart.
What is a wedge?
Force is measured in this unit.
What is newtons (N)?
Draw a distance/time graph where the object is at rest.
(Your graph should have a straight horizontal line on it)
What is the equation for work?
w=f*d
Velocity is speed with...
Direction
You pull down on a rope passing over a grooved wheel and it causes a bucket to be lifted up. What simple machine did you use?
Pulley
If two people are applying the same amount of force to the same object in opposite directions, this is called _________ force.
What is balanced force?
A curved line on a distance/time graph tells you...
The object is accelerating
A 1000 newton person that travels 10 meters in 60 seconds generates how much power?
166 watts
What is it called when there is a change in speed or velocity?
What is acceleration?
True or False: Using a simple machine allows you to do less work.
False. A machine allows you to use less force to do work.
Only unbalanced forces cause a change in ______.
Motion.
The slope of a speed/time graph tells you...
Acceleration
How much work does it take to lift a 20 newton book 1.5 meters off the floor?
30 joules
A plane flies 1000 meters in 4 seconds. What is its speed?
250 m/s
You're a construction worker. You take the bus to work, a crane lifts you up onto a tall building, and you move equipment around using a wheelbarrow. You just used a bunch of ___________ machines.
Compound (or complex) machines
This force keeps the planets revolving around the sun.
What is gravity?
Draw a speed/time graph where the object is not accelerating.
(Your graph should have a straight horizontal line on it)
Julie and her twin sister Julia both weigh 300 newtons. They race up a 100 meter staircase. Julie takes 60 seconds to get to the top. Julia takes 120 seconds to get to the top. Who did the most work?
Trick question- they both did the same total amount of work, but their power was different.
A racecar does two laps around a track and stops. The length of the track is 400 meters.
Two answers:
1) What distance did the car travel? 2) What was the car's displacement?
Distance: 800 meters
Displacement: 0 meters
List the six simple machines.
Lever, Pulley, Wheel & Axle, Wedge, Screw, & Inclined plane