### Motion and Time - Worksheets

CBSE Worksheet-01

Class – VII Science (Motion and Time)

1. The change in position of an object with respect to the surroundings is called
1. Force
2. Motion
3. Momentum
4. Movement
2. The earliest clocks for measuring time during day were
1. Sand clocks
2. Pendulum clocks
3. Sundials
4. Stop watches
3. An athlete covers 300 m in 5 seconds .What is his average speed ?
1. 30 m/s
2. 60 m/s
3. 50 m/s
4. 75 m/s
4. S.I unit of speed is
1. m/s
2. km/h
3. m/h
4. km/s
5. Match the following :-
 Column A Column B (a) One decade (i) 100 years (b) One millennium (ii) 1000 m (c) One kilometer (iii) 1000 years (d) One hour (iv) 10 years (e) A century (v) 3600 seconds
6. Fill in the blanks with suitable words.
1. Distance travelled by a body in unit time is called ________.
2. 72 km/h is equal to _______m/s.
3. A complete to and fro movement of the pendulum is called _________.
4. A mineral used in the crystal form in watch is _______.
5. A body is said to be in _________ if it covers equal distance in equal interval of time.
7. What is a simple pendulum ?
8. What is odometer ? What is its function ?
9. Define motion. Write difference between uniform and non- uniform motion ?
10. Give one word for the following :-
1. An instrument fitted in vehicle to measure the speed.
2. The time taken by a pendulum to complete one oscillation.
3. S.I. unit of time.
4. The Dutch scientist who made the pendulum clock.
5. Watch used to measure exact time taken during the event.

CBSE Worksheet-01
Class – VII Science (Motion and Time)

1. (b)
2. (c)
3. (b)
4. (a)
5. (a) – (iv), (b) – (iii), (c) – (ii), (d) – (v), (e) – (i).
6. (a) Speed (b) 20 (c) An Oscillation (d) Quartz (e) Uniform motion.
7. A simple pendulum is a small mass hung from a fixed point such that it can swing freely under the influence of gravity.Most simple pendulums consist of a small metallic ball called a bob hung on a string or wire.
8. Odometer is a device that records total distance covered by the vehicle. It is used to calculate the distance travelled in a particular journey.
9. The change in position of a body with time is called motion.When a body covers equal distance in equal interval of time the motion is called uniform motion. When a body covers unequal distance in equal interval of time, the speed is called non- uniform motion.
1. Speedometer
2. time-period
3. second
4. Huygens in 1656
5. Stop watch.