(C) According to Newton's second law of motion,the force exerted is given by $F = \frac{\Delta p}{\Delta t}$,where $\Delta p$ is the change in momentu

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reduce the force exerted by the ball on hands

(C) According to Newton's second law of motion,the force exerted is given by $F = \frac{\Delta p}{\Delta t}$,where $\Delta p$ is the change in momentum and $\Delta t$ is the time taken.By pulling his hands backwards,the goalkeeper increases the time $(\Delta t)$ taken to bring the ball to rest.Since the force is inversely proportional to time,increasing the time interval reduces the impact force exerted by the ball on the goalkeeper's hands,thereby preventing injury.

Class 9 Science FORCE AND LAWS OF MOTION Mix Example - FORCE AND LAWS OF MOTION

Easy

$A$ goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to

A
exert larger force on the ball
B
increase the rate of change of momentum
C
reduce the force exerted by the ball on hands
D
decrease the rate of change of momentum

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FORCE AND LAWS OF MOTION

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Mix Example - FORCE AND LAWS OF MOTION

While dusting a carpet,we suddenly jerk or beat it with a stick because:

Easy

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$A$ certain force exerted for $1.2 \, s$ raises the speed of an object from $1.8 \, m s^{-1}$ to $4.2 \, m s^{-1}$. Later, the same force is applied for $2 \, s$. How much does the speed change in $2 \, s$?

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Given below are some measuring units of different physical quantities:
$kg\, ms^{-2}, ms^{-2}, kg\, ms^{-1}, ms^{-1}, kg\, m^2 s^{-2}$
Select the units which measure force and momentum respectively.

Easy

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$(a)$ State Newton's first and third laws of motion.
$(b)$ $A$ car of mass $1800 \, kg$ moving with a speed of $10 \, m s^{-1}$ is brought to rest after covering a distance of $50 \, m$. Calculate the force acting on the car.

Medium

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Give the magnitude and direction of the net force acting on:
$(a)$ a drop of rain falling down with a constant speed.
$(b)$ a cork of mass $10 \,g$ floating on water.
$(c)$ a kite skilfully held stationary in the sky.

Medium

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$A$ goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to

Similar Questions

While dusting a carpet,we suddenly jerk or beat it with a stick because:

$A$ certain force exerted for $1.2 \, s$ raises the speed of an object from $1.8 \, m s^{-1}$ to $4.2 \, m s^{-1}$. Later, the same force is applied for $2 \, s$. How much does the speed change in $2 \, s$?

Given below are some measuring units of different physical quantities:$kg\, ms^{-2}, ms^{-2}, kg\, ms^{-1}, ms^{-1}, kg\, m^2 s^{-2}$Select the units which measure force and momentum respectively.

$(a)$ State Newton's first and third laws of motion.$(b)$ $A$ car of mass $1800 \, kg$ moving with a speed of $10 \, m s^{-1}$ is brought to rest after covering a distance of $50 \, m$. Calculate the force acting on the car.

Give the magnitude and direction of the net force acting on:$(a)$ a drop of rain falling down with a constant speed.$(b)$ a cork of mass $10 \,g$ floating on water.$(c)$ a kite skilfully held stationary in the sky.

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Given below are some measuring units of different physical quantities:
$kg\, ms^{-2}, ms^{-2}, kg\, ms^{-1}, ms^{-1}, kg\, m^2 s^{-2}$
Select the units which measure force and momentum respectively.

$(a)$ State Newton's first and third laws of motion.
$(b)$ $A$ car of mass $1800 \, kg$ moving with a speed of $10 \, m s^{-1}$ is brought to rest after covering a distance of $50 \, m$. Calculate the force acting on the car.

Give the magnitude and direction of the net force acting on:
$(a)$ a drop of rain falling down with a constant speed.
$(b)$ a cork of mass $10 \,g$ floating on water.
$(c)$ a kite skilfully held stationary in the sky.