Let's Get to Work
I've Got the Power
Use the Force, Luke!
Defying Gravity
100
A slice of pizza weighing 1 Newton is lifted 2 meters. How much WORK was done on the pizza?
(W = F x d)
2 Joules
100
Aubrey was hungry and wanted a smoothie. She puts her ingredients in and then turns the blender on for a total of 15 seconds. The blender did 375 Joules of work. How much power did the blender use?
(P = W / t)
25 Watts
100
Balanced forces have a NET FORCE of ________.
Zero!
100
Which of the following describes the gravitational force acting on an object?
A) Mass
B) Power
C) Weight
D) Distance
C) Weight
200
Ms. Plowden uses 50 Joules to push a chair 5 meters across the floor. With what FORCE was the chair pushed?
(W = F x d)
10 Newtons
200
How much work is done using a 500 Watt lightbulb for 3600 seconds?
(P = W / t)
1,800,000 Joules
200
What is the net force on this car?
25 N right
200
To increase the amount of gravitational force between two objects, ____________ the mass.
Increase or Decrease?
Increase
300
Mr. Bishop uses 100 Newtons of force to lift a Civics book. A total of 150 Joules of work was done. How far did he lift the book?
(W = F x d)
1.5 meters
300
How long does it take for a 10 Watt phone charger to do 850 Joules of work?
(P = W / t)
85 seconds
300
Using the diagram below determine the net force and the direction acting on the box. Don't forget units !!!
10 N Right
300
To increase the amount of gravitational force between two objects,______ the distance between the objects.
Increase or Decrease?
Decrease
400
Mr. Peterson's car broke down. He exerted a force of 7,000 Newtons on his car, but could not get it to move. How much work was done on the car?
(W = F x d)
0 Joules
400
How much work is done using a 500 Watt Microwave for 5 minutes? (5 minutes = 300 seconds)
(P = W / t)
150,000 Joules
400
Jared and Liam are competing to move a heavy equipment crate across the gym floor.
Jared pushes the crate with a force of 29 N to the right.
Liam pushes against the crate from the other side with a force of 67 N to the left.
Draw a net force diagram representing the scenario above. Include and clearly label all applied forces acting on the cart.
38 N left
400
What is the gravitational force on the object?
196 N
500
Is carrying your water bottle from Ms. Cribbs' class to Mrs. McMurrer's class WORK? Explain why or why not.
Nope! The force and direction must be the same to be considered WORK!
500
A set of pulleys is used to lift a piano weighing 1,000 Newtons. The piano is lifted 3 meters in 60 seconds. How much POWER is used?
W = F x d
P = W / t
50 Watts
500
Ms. Alvarez and Mr. Thompson are pushing a cart full of laptops down the hallway to the computer lab for testing day. The cart weighs 240 N. They are both pushing the cart north down the hallway.
- Ms. Alvarez pushes the cart with 70 N of force.
- Mr. Thompson pushes the cart with 95 N of force.
- The cart experiences 85 N of rolling friction opposing the motion.
Draw a net force diagram representing the scenario above. Include and clearly label all applied forces, frictional force, gravitational force, and normal force acting on the cart.
(70N + 95N) - 85N = 80N North
500
Is the gravitational pull stronger between the Sun and Earth or between the Sun and Saturn?
The Sun and Earth! (less distance between them)