Problema mo?
Solusyunan yan
Hala sige!
May the force be with you
Energy
100
Identify each part as - acceleration, deceleration, or traveling at a constant velocity.
A - acceleration
B - constant velocity
C - deceleration
100
A coin rolls 5 meters left then turns and rolls 4 meters to the right.
What distance did the coin roll?
d = 9 m
100
A rollercoaster slows from 30 m/s to a stop in 10 seconds. How fast did the rollercoaster accelerate?
a = -3m/s/s
(Remember: a stop = 0 m/s)
100
An object rolls to a stop.
Which of Newton's laws does this represent?
What force stopped the object?
1st - every object in motion stays in motion unless an outside force is applied.
200
What is the distance of the first 3 seconds?
d = vt
d = (30m/s) (3s)
d= 90 m
200
Stephen dashes to the store 720 meters away in 60 seconds. How fast did Stephen run?
12 m/s
200
Can energy be created?
No!
200
If the acceleration of an object increases (and the mass stays the same), what would happen to the net force on the object?
The net force would increase.
(Consider the formula F=ma, if a goes up, then F goes up)
200
What two factors affect the amount of potential energy in an object?
Height and mass
300
What is the speed of part A-B?
v = d/t
v=3km/5hr
v = 0.6 km/hr
300
What is the force on a 1000 kg elevator that is falling freely at 9.8 m/sec 2?
f=9,800 N
300
A 3 kg chair is being pulled to the right with 13 N of force and being pulled to the left with 17 N of force. What is the acceleration of the chair?
(you might draw a free-body diagram)
1.33 m/s/s
300
Draw the free body diagram and find the net force of the following:
A cart is being pushed to the left by Frank with 20N and to the left by Janine with 15N. Friction is working against them with 10 N of force.
300
What two factors affect the amount of kinetic energy an object has?
Speed(velocity) and mass
400
What parts have a positive acceleration?
A and D
400
Kevin walked 3 miles to the store in 1.4 hours.
What is his velocity?
2.14 mi/hr to the store
400
A bike accelerates uniformly from rest to a speed of 7.10 m/s in 3 seconds. Determine the acceleration of the bike.
2.37 m/s/s
400
If a hammer hits a nail with 3 N of force. How much force does the nail push back on the hammer with?
Which of Newton's Laws explains your answer?
3N
3rd law - equal and opposite reaction.
400
Which of Newton's laws explains how a bird flies?
3rd Law - equal and opposite reaction
500
How much force is needed to accelerate a 66 kg skier at 2 m/sec 2?
f=ma
f= (66kg)(2m/s)
f = 132 kg.m/s or 132 N
500
A coin rolls 5 meters left then turns and rolls 4 meters to the right.
What displacement did the coin have at the end?
displacement = 1 m left
500
Can energy be destroyed?
No!
500
A 89kg man jumps out a plane. Determine his net force and direction before he pulls his parachute.
(Remember to consider what is making him move/fall)
89kg x 9.8m/s/s = 872.2N down
(gravity is your acceleration)
500
werwer
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