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4.Unbalanced force:pulling a cart:Balanced force:_______ A.Rolling ball B.Swinging pendulum C.sitting on the chair D.dribbling a basketball
5.Frictional force:rubbing your hands:Tension force:_______ A.Pushing a cart B.Hanging pen C.book on top of the table D.pins sticks on a magnet
6.The law of inertia applies to________ A.Moving objects B.Objects that are not moving C.only A D.both A and B
7.An object's velocity will not change unless it is acted on by a(n) A.Net force B.Strong force C.unbalanced force D.opposite but equal force
8.If you were in a spaceship and fired a cannonball into frictionless space,the amount of force needed to keep it going would be_________. A.Twice the force with which it was fired. B.One half the force with which it was fired. C.The same amount of force with which it was fired. D.Zero,since no force is necessary to keep it moving
9.It is more difficult to start a 50-kg box sliding across the floor than a 5-kg box because the 50-kg box has greater. A.size B.inertia C.volume D.velocity
10.The force needed to give a 1-kg mass an acceleration of 1 m/s2 is_______. A.0 N B.0.1 N C.1 N D.9.8 N
11.Which of the following explains why a passenger in a speeding bus is thrown forward when the bus suddenly stops? A.inertia B.acceleration C.gravitation D.interaction
12.A mass is doubled and the net force is kept constant.The acceleration of the body_______. A.is halved B.is doubled C.is tripled D.remains the same
14.The action the reaction forces referred to in Newton's third law of_______. A.Act on different bodies B.Act on the same bodies C.need not be equal in magnitude D.must have the same line of action
15.A bag lies on top of the table Which of the following statements correctly describes the situation? A.The bag exerts no force on the table. B.There are no forces acting on the bag. C.The bag is absolutely at rest in any reference frame. D.There are many forces acting on the bag but they balanced each other.
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