Force
Force is measured in this unit.
What is newtons (N)?
The slope of a distance/time graph represents the objects ____________
Speed
If the object does not _______, no work is done.
Move a distance!
Name the two things you need to know to determine an object's speed.
What are distance and time?
This simple machine is used to cut, split, or push apart.
What is a wedge?
This force keeps the planets revolving around the sun.
What is gravity?
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, the force is _____________
What is balanced force?
A curved line on a distance/time graph tells you...
The object is accelerating
How much work does it take to lift a 20 newton book 2 meters off the floor?
40 joules
This is the term for a change in velocity
What is acceleration?
List the six simple machines.
Lever, Pulley, Wheel & Axle, Wedge, Screw, & Inclined plane
Only unbalanced forces cause a change in ______.
Motion.
The slope of a speed/time graph represents the objects____________
Acceleration
A 1000 newton person that travels 10 meters in 60 seconds generates how much power?
166 watts
A plane flies 1000 meters in 4 seconds. What is its speed?
250 m/s
Machines are more efficient when this invisible force is reduced.
8 Newtons
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.
One way that a simple machine makes work easier.
Correct answer is any of these:
-Change the direction of the input force
-Multiply the input force