Physics Class 9 chapter 3 numericals kpk book/board

Q1. 1580kg car is travelling with a speed of 15.0 m/s. what is the magnitude of the horizontal
net force that is required to bring the car to a halt in a distance of 50.0m.
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Q2. A bullet of mass 10g is fixed with a rifle. The bullet takes 0.003s to move through barrel
and leaves with a velocity of 300m/s. What is the force exerted by the rifle?
.
Q3. A 2200 kg vehicle travelling at 94km/h(26m/s) can be stopped in 21s by gently applying
the barkers. It can be stopped in 3.8s. if the driver slams on the brakes. What average force
is exerted on the vehicle in both of these stops.
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Q4. You want to move a 500N crate across a level floor. To start the crate moving, you have
to pull with a 230N horizontal force. Once the crate “breaks loose” and starts to move, you
can keep it moving at constant velocity with only 200N. What are the co-efficient of static
and kinetic friction?
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Q5. Two bodies of masses 3kg and 5kg are tied to string which is passed over a pulley. If the
pulley has no friction, find the acceleration of the bodies and tension in the string.
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Q6. Determine the magnitude of the centripetal force exerted by the rim of a car’s wheel on
a 45.0 kg tire. The tire has 0.408 meter radius and is rotating at a speed of 30.0 m/s.
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Q7. A motorcyclist is moving along a circular wooden track of a circus (death well) of radius
5m at a speed of 10m/s. If the total mass of motorcycle and the rider is 150 kg, find the
magnitude of centripetal force acting on him?
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Q8: A car of mass 1000kg is running on a circular motorway interchange near swabi with a
velocity of 80m/s, the radius of circular motorway interchange is 800m. How much
centripetal force is required?
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