Motion and Time Class 7 Science Chapter 13 Questions
In this Motion and Time Class 7 worksheet, we have questions from Motion and Time chapter 13. This science worksheet makes you exam-ready. By attempting this worksheet with time-bound will give you the best preparedness for the exam.
1. Define motion.
2. Define speed. State its S. I. unit.
3. Differentiate between uniform and non-uniform motion.
4. Describe a simple pendulum. Draw a diagram. What kind of motion does it show?
5. For a simple pendulum; define:-
a. One oscillation
b. Time period
c. Frequency
6. A truck travels a distance of 540 km in 4.5 hours. Calculate its speed.
7. The distance between the two stations is 210 km. How much time will it take to cover this distance at an average speed of 7 km/h?
8. A car takes 30 minutes to cover a distance of 25 km. Calculate its speed in km/h.
9. Name the devices that were used to measure time before the pendulum clock became popular.
10. Fill in the blanks:
a. One microsecond is ____________________ of a second.
b. One nanosecond is _____________________ of a second.
c. ___________ of objects helps us to decide which one is moving faster than the other.
d. The speed of a vehicle is measured with a device called ______________.
e. ________________ measures the distance moved by the vehicle.
f. ________________ is used to measure short intervals of time.
g. 36 km/h is the same as _____________ m/s.
h. The slope of a distance-time graph represents ____________.
i. The distance-time graph for the motion of an object with a constant speed is a _______________ line.
11. Classify the following as motion along a straight line, circular or oscillatory-
a. hands of an athlete in a race
b. pedals of a bicycle in motion
c. The motion of a swing
d. The motion of a merry go round
e. The motion of a freely falling body
12. What are quartz clocks?
13. Calculate the following –
a. A boy cycles down from his house to his school at a speed of 18 Km/hr and reaches there in 20 minutes. How far is the school from his house?
b. A man covers a total distance of 750 Km in his car with an average speed of 50 Km/hr. How much time does he take?
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SOLUTIONS
Motion and time class 7 notes
- The motion of an object is defined as the change in its position with respect to time. When the position of an object does not change with respect to time, the object is said to be at rest or stationary.
- Speed is defined as the rate of change of an object’s position with time. For example. For example, the speed of a car is calculated by taking into account the distance that the car travels in a certain amount of time.
Therefore, the SI unit of speed is metres per second (m/s). Speed is also measured in kilometres per hour (km/h). - The differences are stated below –
| Uniform motion | Non-uniform motion |
| It is a type of motion wherein the object moves in a straight line. Its velocity remains unchanged along that straight line, irrespective of the time duration. It occupies equal distances at equal time intervals. | Contrary to Uniform motion, Non-Uniform Motion is a type of motion wherein the object moves at different speeds and does not cover the same distance at equal time intervals, irrespective of the duration of the time interval. |
| Uniform motion has zero acceleration. | The non-uniform motion has non-zero acceleration. |
| The uniform motion and the actual speed of the object are identical. | The non-uniform motion varies from the object’s actual speed. |
| The equal distance at an equal interval of time. | Unequal distances at equal intervals of time. |
| The distance to time graph is a straight line. | The distance to time graph shows a curved line. |
4. A simple pendulum is a mechanical system that is used to assess time by leveraging its oscillatory motion. It mainly consists of 3 parts –
- A bob – The bob is a small mass of metal.
- A string – The string is attached to the bob to provide motion to the bob.
- Rigid support – The bob is tied firmly to the fixed support using the string.
The mechanical arrangement of a simple pendulum reflects periodic motion.
5.
a. One oscillation – A simple pendulum completes one oscillation when its bob starts from one extreme position A and moves to the other extreme position B and then returns to A.
b. Time period – The time taken to complete one oscillation is defined as the time period of a simple pendulum. In a simple pendulum, the time period remains constant.
c. Frequency – The frequency of a simple pendulum is defined as the number of full oscillations per unit of time.
6. 120 km/hr.
7. 30 hours.
8. 50 km/h
9. Humans depended on 2 devices before the origin of pendulums –
i. Sundial – It was used to measure time by the shadow cast by the sun.
ii. Sand Clock – It was used to measure time with the flow of sand.
10.
a. One millionth
b. One billionth
c. Speed
d. Speedometer
e. Odometer
f. Stop Watch
g. 10 m/s
h. Speed
i. Straight
11.
a. Oscillatory
b. Circular
c. Oscillatory
d. Circular
e. Straight Line
12. Quartz clocks are clock mechanisms that use quartz crystals to calculate time. They are also called electronic clocks and watches. The mechanisms of a quartz clock depend on the electric field of a quartz crystal. When a quartz crystal is placed in an electronic circuit, the interaction between the mechanical stress and the electrical field causes the crystal to vibrate. This generates a constant electric signal which is used to measure time.
13.
a. 5.4 kilometres
b. 15 hours
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