Grade 7 Science practice

What is on the worksheet

1. An object moves at constant velocity -8 m/s for 30 s. Find displacement in m.

2. A sample has mass 440 g and volume 55 cm³. Calculate density in g/cm³.

3. A device receives 4100 J and delivers 205 J of useful energy. Find its efficiency as a percentage.

4. An object moves at constant velocity 24 m/s for 3 s. Find displacement in m.

5. A model vehicle travels 450 m in 10 s at constant speed. What is its speed in m/s?

6. A device receives 700 J and delivers 525 J of useful energy. Find its efficiency as a percentage.

7. A device receives 200 J and delivers 160 J of useful energy. Find its efficiency as a percentage.

8. A device receives 4600 J and delivers 1380 J of useful energy. Find its efficiency as a percentage.

9. A model vehicle travels 322 m in 7 s at constant speed. What is its speed in m/s?

10. A device receives 5400 J and delivers 1620 J of useful energy. Find its efficiency as a percentage.

11. A model vehicle travels 175 m in 35 s at constant speed. What is its speed in m/s?

12. A sample has mass 144 g and volume 9 cm³. Calculate density in g/cm³.

13. A sample has mass 720 g and volume 60 cm³. Calculate density in g/cm³.

14. A sample has mass 150 g and volume 50 cm³. Calculate density in g/cm³.

15. Why can a globe and lamp help explain day and night even though they are not to scale?

16. A sample has mass 550 g and volume 50 cm³. Calculate density in g/cm³.

17. An object moves at constant velocity 13 m/s for 18 s. Find displacement in m.

18. A model vehicle travels 648 m in 8 s at constant speed. What is its speed in m/s?

19. A model vehicle travels 1560 m in 24 s at constant speed. What is its speed in m/s?

20. An object moves at constant velocity 3 m/s for 22 s. Find displacement in m.