c) Describe why that should happen based on what you know about the force of friction. Problems 1 . A 7kg box is pulled across a table by a ribbon. The person exerts a force of 40N at an angle of 30. a. Calculate the acceleration of the box. b. How big a force of friction would you need in order for the box to be traveling at a constant speed across the table. 2. What is the mystery mass? 56.3 45 TB=36N T =28.2N m? 3. A rocket with mass 3000kg is fired from rest from the ground at an angle of elevation of 60. The motor exerts a thrust of 60,000N at a constant angle of 60 to the horizontal for 50s and then cuts out. Ignore the mass of the fuel consumed and neglect aerodynamic drag. Determine the vertical acceleration experienced by the rocket.54443 Standard Module 4 STAD Activity 1: Basic Newton's Laws 1) State each of Newton's three laws of motion and an example of where they apply. 1 st Law Application 2 nd Law Application 3 'd Law Application 2. Define the following terms- Mass- Inertia- weight- Activity 2: Conceptual Questions 1) You hold an apple over your head. a) Identify all the forces acting on the apple and their reaction forces b) When you drop the apple identify all the forces acting on it as it falls and the corresponding reaction forces. Ignore air resistance. 2) For each of the following interactions, identify action and reaction forces. A) A hammer hits a nail. B) Earth gravity pulls down on a book. C) A helicopter blade pushes air downward.Activity 3: Lab Question In the friction lab, we had a group that varied the surface texture of a block and measured the force of friction by pulling the block along at a constant speed with a force sensor. a) The force sensor measures the force that the person uses to pull the block. Why is that equal to the force of friction? Draw a force diagram of the block and use Newton's second law to show the force of friction equals the force of the pull. b) Sketch a graph of the force of friction versus the surface texture. What should it have looked like? c) Describe why that should happen based on what you know about the force of friction. Problems 1. A 7kg box is pulled across a table by a ribbon. The person exerts a force of 40N at an angle of 30. a. Calculate the acceleration of the box. b. How big a force of friction would you need in order for the box to be traveling at a constant speed across the table. 2. What is the mystery mass? 56.3 45 TR=36N2. Define the following terms- Mass- Inertia- weight- Activity 2: Conceptual Questions 1) You hold an apple over your head. a) Identify all the forces acting on the apple and their reaction forces b) When you drop the apple identify all the forces acting on it as it falls and the corresponding reaction forces. Ignore air resistance. 2) For each of the following interactions, identify action and reaction forces. A) A hammer hits a nail. B) Earth gravity pulls down on a book. C) A helicopter blade pushes air downward. 3) A rocket becomes progressively easier to accelerate as it travels through space. Why is this so? (Hint: About 90% of the mass of a newly launched rocket is fuel.) 4) Push a cart and it moves. When you stop pushing, it comes to rest. Does this violate Newton's law of inertia? Defend your answer. Activity 3: Lab Question In the friction lab, we had a group that varied the surface texture of a block and measured the force of friction by pulling the block along at a constant speed with a force sensor. a) The force sensor measures the force that the person uses to pull the block. Why is that equal to the force of friction? Draw a force diagram of the block and use Newton's second law to show the force of friction equals the force of the pull. b) Sketch a graph of the force of friction versus the surface texture. What should it have looked like