Class 9

FORCE AND LAWS OF MOTION question bank (Science)

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Q1.

If action is always equal to the reaction,explain how a horse can pull a cart.

(A)
The horse pulls the cart with a force greater than the reaction force.
(B)
The horse pushes the ground backward,and the reaction force from the ground moves the horse forward.
(C)
The cart moves because the horse is stronger than the cart.
(D)
The friction between the cart and the ground is zero.
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Q2.

$A$ $8000 \,kg$ engine pulls a train of $5$ wagons,each of $2000 \,kg$,along a horizontal track. If the engine exerts a force of $40000 \,N$ and the track offers a friction force of $5000 \,N$,then calculate the net accelerating force (in $N$).

(A)
$30000$
(B)
$53000$
(C)
$35000$
(D)
$32000$
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