please help me and plz don't give wrong answers questions are in attachment
Answers
11. Whe an object moves along a straight path its motion is called rectillinear motion.
12. when an object moves along the stationary object it is motion
when an object do not moves along the stationary object it is motion..
13. i. Curvillinear
ii. periodic
14. Footstep can't be used as a standard unit as it is not fixed unit and therefore vary from person to person or place to place.
15. An object which moves after regular interval of time is periodic motion.
An object which do not moves after regular interval of time is periodic motion.
16. We need Standard units of Measurement as it do not vary from person to person or place to place.
17. 1.340km
18. 2400m
19. circular motion is a movement of an object along the circumference of a circle or rotation along a circular path. It can be uniform, with constant angular rate of rotation and constant speed, or non-uniform with a changing rate of rotation.
Earth moving around Sun. Ceiling fan moving.
20. A boy moving along a curved path
A car moving along a curved path
21. I am in rest as The bus is moving I am in rest
Answer:
11)car moving along a straight path, a bullet fired from a gun Along a straight line
12)In physics, rest and motion are two different states of a body. A body is said to be at rest if its position does not change with respect to its surroundings. ... Whereas, when the position of a body changes with respect to its surroundings, it is said to be in motion
13) curvilinear motion
oscillatory motion
14)as everyone's foot is of different sizes
15)Periodic motion is the motion in which the object move or repeat itself in a fixed interval of time like earth move itself in fixed time i.e. 24 hours. Non- periodic motion is the motion in which can't repeat itself in a fixed interval of time.
16)We need standard unit for measurement to make our judgement more reliable and accurate. For proper dealing, measurement should be same for everybody. Thus there should be uniformity in measurement. For the sake of uniformity we need a common set of units of measurement, which are called standard units. Nowadays Si units in science and technology almost universally.
17) 1 kilometer 340 metre or 1.34 kilometer
18) 2.4km = 2.4*1000m=2400km
19)Circular motion is described as a movement of an object while rotating along a circular path. Circular motion can be either uniform or non-uniform. During uniform circular motion the angular rate of rotation and speed will be constant while during non-uniform motion the rate of rotation keeps changing.
Some of the most common examples of circular motion include man-made satellite that revolves around the earth, a rotating ceiling fan, a moving car’s wheel, the blades in a windmill, and gears in gas turbines.
A particle is said to execute circular motion when it moves along the circumference of a circular path. An important aspect of circular motion is that the direction of motion is changing continuously unlike in the case of linear motion. Hence circular motion can also be described in terms of angular variables.
20)Examples of the oscillatory motion. The clock, The tuning fork, The spring, The stretched string, The motion of the swing, The rotary bee. ... Curvilinear motion is the movement of an object as it moves along a curved path in two or three dimensions. The circular motion is uniform,so it is also periodic motion
21)When sitting in a moving bus and looking out, you are also in motion moving with the same speed and in the same direction as the bus.
This question is on inertia.
The law of inertia states that a body remains in its state of rest or uniform motion in a straight line unless an external force is applied to it.
When a body is placed in a moving object it also moves at the same speed as the moving object.
Therefore when you sit in a moving bus you are also in motion in the same direction and speed as the bus.