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**Forces Quiz: Clicker Review – Practice MC**

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W_L_E_ Y E K F Y A G B I O V S

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**the truck exerts a greater amount of force on the car than the car exerts on the truck.**

the car exerts a greater amount of force on the truck than the truck exerts on the car. neither exerts a force on the other, the car gets smashed simply because it gets in the way of the truck. the truck exerts a force on the car but the car doesn’t exert a force on the truck. the truck exerts the same amount of force on the car as the car exerts on the truck.

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**The motion of a car is represented with the motion diagram below**

The motion of a car is represented with the motion diagram below. Choose the FBD that matches this situation. x x y x y x y x y

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**its weight vertically downward along with a steadily decreasing upward force.**

a steadily decreasing upward force from the moment it leaves the hand until it reaches its highest point beyond which there is a steadily increasing downward force of gravity as the object gets closer to the earth. a constant downward force of gravity along with an upward force that steadily decreases until the ball reaches its highest point, after which there is only the constant downward force of gravity. a constant downward force of gravity only. none of the above, the ball falls back down to earth simply because that is its natural action.

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(A) (B) (C) (D) (E)

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**Equal to the speed “vo“ it had before it received the “kick”.**

Equal to the speed “v” it acquires from the “kick” and independent of the speed “vo“. Equal to the arithmetic sum of the speeds “vo“ and “v” Smaller than either of speeds “vo“ and “v” Greater than either of speeds “vo“ and “v”, but smaller than the arithmetic sum of these two speeds.

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No change Continuously increasing Continuously decreasing Increasing for a while, and decreasing thereafter Constant for a while, and decreasing thereafter

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**The downward force due to gravity and the effect of air pressure**

The downward force of gravity and the horizontal force of momentum in the direction of motion The downward force of gravity, the upward force exerted by the table, and a horizontal force acting on the puck in the direction of motion The downward force of gravity and an upward force exerted on the puck by the table Gravity dos not exert a force on the puck, it falls because of the intrinsic tendency of the object to fall to its natural place

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**neither student exerts a force on the other.**

student “a” exerts a force on “b”, but “b” doesn’t exert any force on “a”. each student exerts a force on the other but “b” exerts the larger force. each student exerts a force on the other but “a” exerts the larger force. each student exerts the same amount of force on the other.

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Mary pulls on a lawnmower parallel to the surface so that it moves at a constant speed up the hill. Construct an FBD that best represents the motion of the mower. x y x y x y x y

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1 only 1 and 2 1, 2, and 3 1, 2, and 4 None of these, since the book is at rest there are no forces acting on it

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the amount of force of the car pushing against the truck is equal to that of the truck pushing back against the car. the amount of force of the car pushing against the truck is less than that of the truck pushing back against the car. the amount of force of the car pushing against the truck is greater than that of the truck pushing back against the car. the car’s engine is running so it applies a force as it pushes against the truck but the truck’s engine is not running so it can’t push back against the car, the truck is pushed forward simply because it is in the way of the car. neither the car nor the truck exert any force on the other, the truck is pushed forward simply because it is in the way of the car.

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the amount of force of the car pushing against the truck is equal to that of the truck pushing back against the car. the amount of force of the car pushing against the truck is less than that of the truck pushing back against the car. the amount of force of the car pushing against the truck is greater than that of the truck pushing back against the car. the car’s engine is running so it applies a force as it pushes against the truck but the truck’s engine is not running so it can’t push back against the car, the truck is pushed forward simply because it is in the way of the car. neither the car nor the truck exert any force on the other, the truck is pushed forward simply because it is in the way of the car.

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**the upward force on the elevator by the cable is greater than the downward force of gravity.**

the amount of upward force on the elevator by the cables is equal to that of the downward force of gravity. the upward force on the elevator by the cable is less than the downward force of gravity. it goes up because the cable is being shortened, not because of the force being exerted on the elevator by the cable. the upward force on the elevator by the cable is greater than the downward force due to the combined effects of air pressure and the force of gravity.

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(A) (B) (C) (D) (E)

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1 only 1 and 2 1, 2, and 3 1 and 3 2 and 3

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Which FBD below best represents the forces exerted on the ball as it is moving UP (ignore air resistance)?

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(A) (B) (C) (D) (E)

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constant. continuously increasing. continuously decreasing. increasing for a while and constant thereafter. constant for a while and decreasing thereafter.

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(A) (B) (C) (D) (E)

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constant. continuously increasing. continuously decreasing. increasing for a while and constant thereafter. constant for a while and decreasing thereafter.

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**Stacey pulls a mower at 40-degrees relative to the ground**

Stacey pulls a mower at 40-degrees relative to the ground. Which free body diagram best represents the forces on the mower if she is accelerating? x 400 y y x 400 y x 400 x y 400

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**If the force applied to the box is doubled, the constant speed of the box will increase to 8 m/s**

The amount of force applied to move the box at a constant speed must be more than its weight The amount of force applied to move the box at a constant speed must be equal to the amount of the frictional forces that resist its motion The amount of force applied to move the box at a constant speed must be more than the amount of the frictional forces that resist its motion There is a force being applied to the box to make it move but the external forces such as friction are not “real” forces they just resist motion

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stop immediately. continue at a constant speed for a very short period of time and then slow to a stop. immediately start slowing to a stop. continue at a constant velocity. increase its speed for a very short period of time, then start slowing to a stop.

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**Construct a speed versus time chart that best represents this situation.**

y v x v t v t v t t

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© 2012 Pearson Education, Inc. Q4.1 v Motor Cable Elevator An elevator is being lifted at a constant speed by a steel cable attached to an electric motor.

© 2012 Pearson Education, Inc. Q4.1 v Motor Cable Elevator An elevator is being lifted at a constant speed by a steel cable attached to an electric motor.

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