(Answers are in bold and the questions are italicized)
1. Define the word "work" in terms of science. Work is the amount of effort spent when a force causes and object to move.
2. Edward needs to pick up his textbook from the floor to study for his science test. He exerts a force of 386 N and lifts it up 1.7 m in the air to put it on the table. How much work did he do on the book? W = F x d W = 386 x 1.7 W = 656.2 J Edward did 656.2 J of work on his book.
3. Anna is pushing on the wall with a force of 32 N. Is she doing any work on the wall? Explain. No she did not do work on the wall because she only applied force to it and the wall did not move at all. If you tried to solve it in an equation, you'll get 0 J.W = F x dW = 32 x 0W = 0 J 4.Bob is pushing a 13 kg desk and moves it 4 m. How much work did he do on the desk?F = m x gF = 13 x 9.8F = 127.4 N W = F x dW = 127.4 x 4W = 509.6 JBob did 509.6 J of work on the desk. 5.Chloe moving a 23 g laptop 49 cm on to her lap. How much work is she doing on the laptop?23 g = 0.023 kg F = m x gF = 0.023 x 9.8F = 0.2254 N 49 cm = 0.49 m
W = F x d W = 0.2254 x 0.49 W = 0.110446 J Chloe does 0.110446 J of work on the laptop.
Answers on Energy Questions
(Answers are in bold and the questions are italicized)
1. Define the word "energy", "potential energy", and "kinetic energy". Energy is the ability to do work. Potential energy is stored energy that can be used later on. Kinetic energy is an object that is moving.
2. Classify each of the following as potential energy or kinetic energy:
a) A car is rolling down the hill with the engines off.
b) An elastic is stretched back and is ready to be fired.
c) A rock is held in the air about to be dropped.
a) Kinetic energy
b) Potential energy
c) Potential energy
3. When someone is running to home plate in baseball, he/she stops very quickly. Why is this? Your answer should be related to energy. When a person slides to home plate, most of the energy is transformed into thermal energy or friction making the person stop quicker. Energy cannot be created or destroyed.
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Answers on Work Questions
(Answers are in bold and the questions are italicized)1. Define the word "work" in terms of science.
Work is the amount of effort spent when a force causes and object to move.
2. Edward needs to pick up his textbook from the floor to study for his science test. He exerts a force of 386 N and lifts it up 1.7 m in the air to put it on the table. How much work did he do on the book?
W = F x d
W = 386 x 1.7
W = 656.2 J
Edward did 656.2 J of work on his book.
3. Anna is pushing on the wall with a force of 32 N. Is she doing any work on the wall? Explain.
No she did not do work on the wall because she only applied force to it and the wall did not move at all. If you tried to solve it in an equation, you'll get 0 J.W = F x dW = 32 x 0W = 0 J
4. Bob is pushing a 13 kg desk and moves it 4 m. How much work did he do on the desk?F = m x gF = 13 x 9.8F = 127.4 N
W = F x dW = 127.4 x 4W = 509.6 JBob did 509.6 J of work on the desk.
5. Chloe moving a 23 g laptop 49 cm on to her lap. How much work is she doing on the laptop?23 g = 0.023 kg
F = m x gF = 0.023 x 9.8F = 0.2254 N
49 cm = 0.49 m
W = F x d
W = 0.2254 x 0.49
W = 0.110446 J
Chloe does 0.110446 J of work on the laptop.
Answers on Energy Questions
(Answers are in bold and the questions are italicized)1. Define the word "energy", "potential energy", and "kinetic energy".
Energy is the ability to do work. Potential energy is stored energy that can be used later on. Kinetic energy is an object that is moving.
2. Classify each of the following as potential energy or kinetic energy:
a) A car is rolling down the hill with the engines off.
b) An elastic is stretched back and is ready to be fired.
c) A rock is held in the air about to be dropped.
a) Kinetic energy
b) Potential energy
c) Potential energy
3. When someone is running to home plate in baseball, he/she stops very quickly. Why is this? Your answer should be related to energy.
When a person slides to home plate, most of the energy is transformed into thermal energy or friction making the person stop quicker. Energy cannot be created or destroyed.