Review part 2. Independent Variable  A variable that you can choose to change/manipulate  What you think affects an outcome  Example: You think that.

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Presentation transcript:

Review part 2

Independent Variable  A variable that you can choose to change/manipulate  What you think affects an outcome  Example: You think that the length of a ramp will affect how much force you need to push a box up a ramp. Independent Variable = length of ramp

Dependent Variable  Depends on Independent Variable (outcome)  You can not choose to change it directly  Example: As you increase the length of a ramp, the amount of force needed to push a box up it decreases. Independent variable = length of ramp Dependent variable = amount of force

Control group  These are the variables in an experiment that do not change.  Example: In the potato lab, we used the same amount of potato strips, both beakers had 250ml of tap water, and both beakers received the same amount of light.

Putting Data in Tables Independent Variables Length of ramp Dependent Variables Force 1m5N 1.5m6N 2m7N 2.5m8N 3m9N 3.5m10N

Graphing Data

Work vs. No Work  Alexis Reads a Book  No Work  Roy draws a picture of a car  Work  Krysta walks to the band hall  Work  Josh is trying to push a wall  No Work

Balanced Forces  Equal Forces acting in opposite directions on an object  No Movement!!!!  Think of the See-Saw!!!!!

Unbalanced Forces  Unequal Forces acting in opposite directions on an object  Causes MOTION!!!!  Think See-Saw!!!

Calculating Work  Work = Force x Distance  W = F x d  What is the unit for Force? Newtons (N)  What is the unit for distance? Meters (m)  What is the unit for work? Joules (J)

Math Practice (Multiplying) 25 x 0 = 25 x 2 = 25 x 0.3 = 25 x 2.5 = 32 x 11.1 = 12 x 2.15 = 1.83 x 5.6 = 3.56 x =

Math Practice Answers 25 x 0 = 0 25 x 2 = x 0.3 = x 2.5 = x 11.1 = x 2.15 = x 5.6 = x =

Rally Coach  The partner to the left will do math problem 1 while the partner to the right watches and makes sure he/she is working the problems correctly. 1) 35 x 2.5 = Answer is 87.5  Switch partners 2) x 12 = Answer is 193.8

Work Problems 1. Sally uses 100N of force to push a box up a ramp a distance of 2.5m. Calculate the Work. 2. Mark applied 150N of force to kick a soccer ball a distance of 12m. Calculate the Work.

Work Problems 3. Amy used a 3.12m ramp to load the lawn mower on to the truck bed. If she had to use 50N of force to push the mower, how much work did she do?

Work Problems 4. Tom used 90N of force to throw a football a distance of 21m. Calculate the work 5. Mary used 35N of force to push the shopping cart a distance of 4.1m. Calculate the Work.

Work Problems Jack and Jill are sitting on a see-saw. Jack is sitting 1.2m above the ground and exerting a force of 23N. Jill is sitting on the opposite end of the see-saw and is exerting a force of 23N. If she is sitting 1.2m above the ground, how much work is being done by Jack and Jill on the see- saw?