11. A particle starts from rest and moves down an inclined plane. If the body reaches a velocity of 2ms in 4 s, calculate (a) the acceleration of the body, (b) the distance travelled by the particle in 4 s. S,
Kinematics
A machine is a device that accepts energy in some available form and utilizes it to do a type of work. Energy, work, or power has to be transferred from one mechanical part to another to run a machine. While the transfer of energy between two machine parts, those two parts experience a relative motion with each other. Studying such relative motions is termed kinematics.
Kinetic Energy and Work-Energy Theorem
In physics, work is the product of the net force in direction of the displacement and the magnitude of this displacement or it can also be defined as the energy transfer of an object when it is moved for a distance due to the forces acting on it in the direction of displacement and perpendicular to the displacement which is called the normal force. Energy is the capacity of any object doing work. The SI unit of work is joule and energy is Joule. This principle follows the second law of Newton's law of motion where the net force causes the acceleration of an object. The force of gravity which is downward force and the normal force acting on an object which is perpendicular to the object are equal in magnitude but opposite to the direction, so while determining the net force, these two components cancel out. The net force is the horizontal component of the force and in our explanation, we consider everything as frictionless surface since friction should also be calculated while called the work-energy component of the object. The two most basics of energy classification are potential energy and kinetic energy. There are various kinds of kinetic energy like chemical, mechanical, thermal, nuclear, electrical, radiant energy, and so on. The work is done when there is a change in energy and it mainly depends on the application of force and movement of the object. Let us say how much work is needed to lift a 5kg ball 5m high. Work is mathematically represented as Force ×Displacement. So it will be 5kg times the gravitational constant on earth and the distance moved by the object. Wnet=Fnet times Displacement.
![7. A car was moving at a constant velocity of 40 ms
The driver saw an obstacle in front and he
immediately stepped on the brake pedal. He managed
to stop the car in 8 s. The distance of the obstacle from
the car when the driver stopped it was 180m. How far
was the obstacle from the car after it stopped? [20m]
8.Hazuri is driving a car at a velocity of 30 m s'. On
seeing a student crossing the road, Hazuri steps on
his brakes to stop the car. The speed of the car
decreases uniformly and comes to a halt after
travelling 150 m.
(a) what is the deceleration of the car when the brakes
are applied?
(b) What is the time interval before the car stops?
9. A car accelerates at a uniform rate from 5 m s to
30 ms in 5 s. Calculate
10. A toy car starts from rest and travels 6 m in 2s.
What is the acceleration of the toy car in the 2 s?
(a) the acceleration of the car,
(b) the velocity of the car after accelerating uniformly
for the first 2 s,
(c) the distance travelled by the car in 5 s.
11. A particle starts from rest and moves down an
inclined plane. If the body reaches a velocity of
2ms in 4 s, calculate
(a) the acceleration of the body,
(b) the distance travelled by the particle in 4 s.
12. Azmi rides a bicycle at a constant acceleration
2 ms from rest and reaches a velocity of
12 ms'1. Calculate the distance travelled by
Azmi.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe96ed667-f613-4a48-9a98-4ad679bde10d%2Fdf93e2f6-4ecd-41de-9734-554a76de6506%2Fynt8qh9_processed.jpeg&w=3840&q=75)
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