Warm-Up Finish the formula for: Force: Weight f=ma w=mg m= a= g=

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Presentation transcript:

Warm-Up Finish the formula for: Force: Weight f=ma w=mg m= a= g= I can promise you, you will find some of these questions on the next test.

Today’s Lesson Please take out a separate sheet of paper and a writing utensil (ask your neighbors, my replacement doesn’t have any) and answer ALL of the following questions. Be respectful and use this time to enhance your understanding of Unit 8. I will be collecting your answers.

Q1 Please record your answers on your separate sheet of paper Would you weigh more on Earth or Jupiter? Explain your reasoning. “Q1: I would weigh more on _____ because ________________________________.”

Q2 What force would be required to accelerate a 40 kg mass by 4 m/s2 “Q2: The Force would be _____” SHOW YOUR WORK

Q3 A 4.0 kg shotput is thrown with 30 N of force. What is its acceleration? SHOW YOUR WORK

Q4 Mr. Dunne weighs 625 N. What is his mass? (Assume this is on Earth) SHOW YOUR WORK

Q5 Describe what would happen to my Mass if I went to the moon. Describe what would happen to me Weight if I went to the moon.

Q6 a) Force (F) = 490N Mass (m) = ? Gravity (g) = 9.8 m/s/s b) Mass (m) = 75 kg

Q7 The value of gravitational pull on the moon is 1.6 m/s/s. What is the weight of a 75 kg astronaut on the moon?

Q8 The elevator in the new office building warns that it can safely lift 300 kg at one time. If John (850 N), Betty (530 N), Robert (740 N) and Alice (610 N) all get in the elevator at once, can the elevator safely carry them up to the third floor?

Q9 If a 60 kg person on a 15 kg sled is pushed with a force of 300 N, what will be person’s acceleration?

Q10 A physical science textbook has a mass of 2.2 kg a. What is the weight on the Earth? b. What is the weight on Mars (g = 3.7 m/s2 ) c. If the textbook weights 19.6 Newtons on Venus, What is the strength of gravity on Venus?

Q11 How much do you weigh? 1lb = 0.453592 kg Find your weight on earth! Now find your weight on the moon (g=1.6 N)

Q12 If a 0.5 kg pair of running shoes would weigh 0.3 Newtons on Pluto, what is the strength of gravity on Pluto? What does the pair of shoes weigh on earth?

Q13 A 50 kg skater pushed by a friend accelerates 5 m/sec2. How much force did the friend apply?

Q14 A force of 250 N is applied to an object that accelerates at a rate of 5 m/sec2. What is the mass of the object?

Q15 What is the acceleration of a 50 kg object pushed with a force of 500 newtons?

Q16 What is the force on a 1000 kg elevator that is falling freely at 9.8 m/sec2

Q17 What type of Friction(s) is/are present if an ice skater stop skating and slowly comes to a stop? What type of Friction(s) is/are present if

Q18 In the picture below, explain why the bear fell. Use FRICTION to explain your answer.

Q19 The acceleration due to gravity is 9.8 m/s2 on earth. Using your knowledge of Friction, explain why objects don’t accelerate infinitely when falling.

Q20 You give a shopping cart a shove down the isle. The cart is full of groceries and has a mass of 18 kg. The cart accelerates at a rate of 3 m/s2 How much force did you exert on the cart?

Q21 (Motion Review) a) A car is traveling at 50mph. How long will it take the car to travel 300 miles? b) A football is thrown at 45 m/s and it flies for 4 seconds. How far will the ball travel? c) If you run 40 meters in 60 seconds, what is your average speed?

Q22 (Newer Concept) (Easy) Tommy and John are trying to move a large table. John pushes with a force of 1150N and Tommy helps him by pushing on the same side of the table with a force of 800N. Sketch the individual forces exerted on the table and then calculate and show the net force exerted on the table.

Q23 (Newer Concept) (Easy) Two teams are competing in a tug-of-war contest. Team A is pulling at 4000N and Team B is pulling at 4900N is the opposite direction. Sketch the forces and show the net force exerted. Which team is winning? Is this force balanced or unbalanced?

Q24 (Newer Concept) (Moderate) A 5 kg block is pulled across a table by a horizontal force of 40 N with a frictional force of 8 N opposing the motion. Calculate the acceleration of the object.

Q24 (Newer Concept) (Difficult) An object of mass 30 kg is falling in air (on Earth) and experiences a force due to air resistance of 50 newtons. Determine the net force acting on the object. Calculate the acceleration of the object.