Physics 1 concepts Questions & Answers

Physics 1 concepts Questions & Answers 3 factors that affects ability of force/torque to cause rotations - ANSWER: 1)the magnitude of the force 2)the distance r from the point of application of the pivot 3) the angle at which the force is appliedu A 0.2 kg plastic cart and a 20 kg lead cart can both roll without friction on a horizontal surface. Equal forces are used to push both carts forward for a time of 1 s, starting from rest. After the force is removed at t=1s, is the momentum of the plastic cart greater than, less than, or equal to the momentum of the lead cart? - ANSWER: equal A 0.2 kg plastic cart and a 20 kg lead cart can both roll without friction on a horizontal surface. Equal forces are used to push both carts forward for a time of 1 s, starting from rest. After traveling 1 m, is the momentum of the plastic cart greater than, less than, or equal to the momentum of the lead cart? - ANSWER: less A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car. During the collision - ANSWER: the forces are equal A ball is thrown directly upward and experiences no air resistance. - ANSWER: The acceleration is downward during the entire time the ball is in the air. A baseball is thrown vertically upward and feels no air resistance. As it is rising - ANSWER: its momentum is not conserved, but its mechanical energy is conserved A baseball player is sliding into second base. What forces are present? - ANSWER: Gravity, normal force, kinetic friction A box of mass m is pulled with a constant acceleration a along a horizontal frictionless floor by a wire that makes an angle of 15° above the horizontal. If T is the tension in this wire, then - ANSWER: T>ma A car is being towed at constant velocity on a horizontal road using a horizontal chain. The tension in the chain must be equal to the weight of the car in order to maintain constant velocity. - ANSWER: false A car is parked on a steep hill. What forces are present? - ANSWER: Force of gravity, friction, and normal force A cart that is accelerating on a level table fires a ball straight up. When the ball comes back down, will it land in front of the launching tube, behind the launching tube, or directly in the tube? - ANSWER: Behind the Tube