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5 pt. 5 pt. 5 pt. 5 pt. 5 pt. 10 pt. 10 pt. 10 pt. 10 pt. 10 pt. 15 pt. 15 pt. 15 pt. 15 pt. 15 pt. 20 pt. 20 pt. 20 pt. 20 pt. 20 pt. 25 pt. 25 pt. 25 pt. 25 pt. 25 pt. 1-5 is sitting on the A physics textbook table in front of you. Are there any forces acting on it? (Draw a FBD) 1-5A is sitting on the A physics textbook table in front of you. Are there any forces acting on it? (Draw a FBD) FN Yes, the book’s weight pulling down and the table pushing up. Fg Which string1-10 pulls harder on the hanging mass? 1 2 Which string1-10A pulls harder on the hanging mass? FT1 FT2 Fg 1 2 String #1 Draw a free-body 1-15 diagram of the forces acting on the object below. It is a stone sliding (with friction) down a ramp. Label all forces! Draw a free-body1-15A diagram of the forces acting on the object below. It is a stone sliding (with friction) down a ramp. Label all forces! Fg 1-20 string below is If the ball on the accelerated upwards at 20 m/s2, draw the string and weight forces to scale… If the ball on 1-20A the string below is accelerated upwards at 20 m/s2, draw the string and weight forces to scale… FT is 3x longer than Fg FT Fg Fnet = 2x Fg 1-25 Type question here. Adjust size & position as necessary. 1-25A Two hockey players are pushing on a puck as it travels across the ice. Their force vectors are shown below. What is the resultant force experienced by the puck? 130 N Fnet 100 N Fnet = √(1002 + 1302) Fnet = 164 N 52o Above x axis 2-5 1 3 2 Along which path will the ball move once it hits the gap? 2-5A 1 3 2 Along which path will the ball move once it hits the gap? Path #2 True 2-10 or False: It is possible for an object to be moving and still be in equilibrium. True 2-10A or False: It is possible for an object to be moving and still be in equilibrium. True – So long as there is no acceleration or change in motion, the object is in equilibrium (FNet = 0 N). Resistance Pull 2-15 A car on a race track travels around the circular track at a constant speed. Is it in equilibrium? 2-15A travels around A car on a race track the circular track at a constant speed. Is it in equilibrium? No – because in order for the car to move in a circle, there has to be a net force causing a change in the car’s direction. You and a friend 2-20 push a heavy crate across the floor at a constant speed. If you push with a combined force of 100 N, how hard is friction pushing back on the crate? A) B) C) D) less than 100 N 100 N exactly more than 100 N not enough info You and a friend 2-20A push a heavy crate across the floor at a constant speed. If you push with a combined force of 100 N, how hard is friction pushing back on the crate? A) B) C) Ff = 100D) N less than 100 N 100 N exactly more than 100 N not enough info Fpush = 100 N Suppose you are2-25 in an elevator as it accelerates upwards. At that moment, you would feel ________. Why is this? Suppose you are2-25A in an elevator as it accelerates upwards. At that moment, you would feel ________. Why is this? Heavier than normal: This is because as the elevator accelerates upwards, you resist that change (due to your inertia), so you feel pressed against the floor harder. Thus, its your reaction to the floor pushing you upward that makes you feel heavier than normal. FN Fg Two objects (one 10-kg 3-5 and one 20-kg) are pressed on by the same force. Which one will accelerate more, and by how much? Two objects (one 10-kg 3-5A and one 20-kg) are pressed on by the same force. Which one will accelerate more, and by how much? The 10-kg object will accelerate by 2x more. 10 kg F = (1/2m)(2a) 20 kg F = (2m) (1/2 a) 3-10 of a 50-kg object What is the weight as it falls at a speed of 100 m/sec in a vacuum? 3-10A of a 50-kg object What is the weight as it falls at a speed of 100 m/sec in a vacuum? The speed of the object has no effect on its weight, so… Fg = mg = (50 kg)(10 m/sec2) Fg = 500 Newtons Fg A 1,000 kg rocket3-15 launches up through the atmosphere pushed by a thrust of 20,000 N. If the air drag is 8,000 N, then what is the acceleration of the rocket? A 1,000 kg rocket3-15A launches up through the atmosphere pushed by a thrust of 20,000 N. If the air drag is 8,000 N, then what is the acceleration of the rocket? FThrust FThrust – FDrag – Fg = ma 20,000N–8,000N–10,000N = 1000kg*a FDrag a = 2 m/s2 Fg A person drives a car down 3-20 a straight road while continually increasing pressure on the gas pedal (thus increasing the accelerating force of the car). Sketch a V-t Graph for the car (SI). A person drives a car 3-20A down a straight road while continually increasing pressure on the gas pedal (thus increasing the accelerating force of the car). Sketch a V-t Graph for the car (SI). Velocity (m/s) Velocity vs Time Time (s) A 75-kg parachutist is falling through the air – 3-25 while experiencing an air drag of 200 N. If he falls from rest for 10 seconds in this manner, how fast is he moving? A 75-kg parachutist 3-25A is falling through the air – while experiencing an air drag of 200 N. If he falls from rest for 10 seconds in this manner, how fast is he moving? v = at so we must find a… Ff Fnet = Weight – Drag = ma So… (75 kg)(10 m/s2) – 200 N = (75 kg)a 550 N/75 kg = 7.33 m/s2 = a v = (7.33 m/s2)(10 sec) = 73.3 m/sec Fg When you bounce4-5off of a trampoline, the force exerted on you by the trampoline is ______ as compared to the force you exert back on it. A) B) C) D) greater than the same less than not enough info When you bounce4-5A off of a trampoline, the force exerted on you by the trampoline is ______ as compared to the force you exert back on it. A) B) C) D) greater than the same less than not enough info 4-10 What is the reaction force that propels a rocket such as the Space Shuttle? A) B) C) D) E) the rocket pushing against the launch pad the force from the atmosphere gravity’s pull from the Earth the exhaust gas pushing on the rocket not enough info 4-10A What is the reaction force that propels a rocket such as the Space Shuttle? A) B) C) D) E) the rocket pushing against the launch pad the force from the atmosphere gravity’s pull from the Earth the exhaust gas pushing on the rocket not enough info A Honda Civic 4-15 and an 18-wheeler moving at the same speed collide head-on. Which one experiences a greater force of impact? A Honda Civic4-15A and an 18-wheeler moving at the same speed collide head-on. Which one experiences a greater force of impact? They both experience the same force, though the Civic, since it has less mass, will undergo a greater acceleration. 4-20 Two students, Small Sid and Big Barney, are playing tug-of-war with a rope. Which of them pulls harder on the rope? Two students, 4-20A Small Sid and Big Barney, are playing tug-of-war with a rope. Which of them pulls harder on the rope? Neither pulls harder – they exert equal and opposing forces on the rope. 4-25surface of the Earth. A 1-N pear sits on the What is the Earth’s weight in reference to this pear? (Note that I’m not asking for the Earth’s mass!) 4-25A A 1-N pear sits on the surface of the Earth. What is the Earth’s weight in reference to this pear? (Note that I’m not asking for the Earth’s mass!) 1 Newton The Earth’s weight depends on the object you’re measuring it against. So since the Earth pulls on the pear with a force of 1-N, the pear pulls back on the Earth gravitationally with a force of 1-N. What’s the5-5punch line? “A neutron walks into a bar; he asks the bartender, 'How much for a beer?' The bartender looks at him, and says…” 5-5A What’s the punch line? “A neutron walks into a bar; he asks the bartender, 'How much for a beer?' The bartender looks at him, and says…” 'For you, no charge.' 5-10 and movie that Name the character produced this famous quote: “Bye-bye boys, have fun storming the castle!” 5-10A Miracle Max, in The Princess Bride 5-15 th On October 19 , 2004, what bigname politician publicly endorsed his state’s ballot initiative that would provide $3 billion in funding for stem-cell research? 5-15A Arnold Schwarzenegger, (former) governor of California 5-20 He was born Gordon Matthew Sumner, but his rock concert tickets read… 5-20A He was born Gordon Matthew Sumner, but his rock concert tickets read… Sting 5-25 On the TV series “Knight Rider,” What was the name of the car? (BONUS Points for what the acronym stands for!) 5-25A K I T T = Knight = Industries = Two = Thousand Daily Double Two hockey players are pushing on a puck as it travels across the ice. Their force vectors are shown below. What is the resultant force experienced by the puck? 130 N 100 N