Let's Go!
Work and Power Baby!
Do you Remember?
Units
100
Which of the Newton's Laws does this picture represent?
Newton's 3rd Law
100
How much work is needed to lift a box weighing 45 newton's 3.0 meters upward?
135 J
100
Noah records the force he used when bowling and has the following data. Which try did Noah's bowling bowl have the fastest speed?
Try #1: Distance 8m and Time 2 sec
Try #2: Distance 6m and Time 1 sec
Try #2
100
What is the unit for work?
J (joules)
200
Who will win? Why?
Team B because the net Force is greater in this direction.
200
A heavy cart is pushed 5 meters on a level surface to produce 50 J. How much force was used to push the cart?
10N
200
True or False:
A book sliding forward on a cart when it stops suddenly is an illustration of Newton's 3rd Law of Motion.
False
200
What is the unit for power?
W (watts)
300
Which Newton's Law does this picture represent? Why?
Newton's 1st Law - inertia
300
How high was a rock raised if you applied 120 J and it weighed 10 Newtons?
12 m
300
__________________ is the rate at which work is done.
Power
300
What is the common unit for distance?
m (meters)
400
Mass
Weight
Weight
Mass
Weight
400
When a machine does 350 joules of work in 15 seconds. What is the power?
P = 23.33 w
400
True or False:
Work is being done while standing still holding a bowling ball.
False
400
What is the unit for force?
N (newtons)
500
You are on the moon and you have a bowling ball and a baseball. You drop them both at the same time. What happens?
A. Both balls fall at the same rate
B. The baseball falls slower than the bowling ball.
C. The bowling ball falls to earth and hits Noah in the noggin.
A. Both balls fall at the same rate.
500
An athlete weighs 250 Newtons, and climbed a ladder 15 meters tall. They produced 3,750 J of work and 540 W of power. How much time did it take to climb the ladder? t = W/P
t = 6.94 s
500
Fill in the blanks:
The amount of work you do depends on both the amount of ______________ you exert, and if the object moves in the same ___________________.
Word Bank: power, direction, force, distance
force, direction
500
What is the unit for time?
sec (seconds)