Transcript brief push
Draw a force diagram for the object below. The box is raised at constant speed. For 100 points FT Fg Draw a force diagram for the object below. The box moves to the left at constant speed. For 500 points FN FA Fk Fg Draw a force diagram for the object below. A small child slides down a frictionless slide. For 300 points FN FY Fg FX Draw a force diagram for the object below. A skydiver falls at constant velocity (include air resistance) For 1000 points Fk Fg A block of dry ice resting on a table is given a brief push. A moment later, what forces are acting on the block? For 2500 points • Normal force and the force of gravity A block of dry ice resting on a table is given a brief push. Describe the motion of the block. For 400 points • The block moves at a constant speed. What forces are acting on the block (dry ice)? For 100 points • Towing force, normal force, and gravity Describe the motion of the block (dry ice) For 10000 points • The block accelerates constantly When the block (dry ice) reaches point B, the string breaks. Describe the motion of the block. For 50000 points • The block moves at a constant speed. Eventually, the block reaches the edge of the table. After the block leaves the table, what forces act on the block? For 1000 points • The force of gravity As a ball falls, consider one force to be the pull of the earth on the ball. What is the pair to this force? For 100 points • The pull of the ball on the earth A horse exerts a 500 N force on a heavy wagon, causing it to accelerate. What force does the wagon exert on the horse? For 8000 points • 500 N force You’re in the back of a friend’s pickup truck when it stalls on a hill. You jump out, get behind the truck and push with all your might (300 N). Still, the truck slowly rolls back down the hill. The force the truck exerts on you is: For 200 points • 300 N When you first learned how to roller skate, you may have gotten started by pushing off the wall at the skating rink. Draw a force diagram for yourself as you accelerate. Using agent-object notation, clearly label all the forces acting on you. For 300 points FA (wall pushing back on you) FN (floor pushing up on you) Fk Fg (earth pulling down on you) A sign hangs from a boom supported by a cable connected to a wall. The cable makes a 30° angle with the boom. Sketch a force diagram for the sign. For 3000 points FT Fy FA Fx Fg The force of tension in the cable is 100 N. Find the mass of the sign. For 400 points Five kilograms You push your lawnmower (mass = 15 kg) across the lawn at constant speed. To do so, you must exert 120 N of force. The handle makes a 35° angle with the horizontal. What is the x-component of the force you apply? For 500 points • - 98 N You push your lawnmower (mass = 15 kg) across the lawn at constant speed. To do so, you must exert 120 N of force. The handle makes a 35° angle with the horizontal. How does the frictional force compare to the x-component of the force? For 200 points • They are equal in magnitude, but in the opposite direction. You push your lawnmower (mass = 15 kg) across the lawn at constant speed. To do so, you must exert 120 N of force. The handle makes a 35° angle with the horizontal. What is the normal force? For 600 points • 219 N A sign hangs from a boom supported by a cable connected to a wall. The cable makes a 30° angle with the boom. The force of tension in the cable is 80 N. What is mass of the sign? For 300 points • 4 kg