Balanced and Unbalanced Forces (Grade 7)
Free printable Grade 7 science worksheet on balanced and unbalanced forces. Students calculate net force and weight in newtons, with worked answers.
Grade 7 · Science worksheet
Name
Date
Science
Balanced and Unbalanced Forces
Work out each net force by subtracting the backwards force from the forwards force, then answer the questions. Show your working.
- 1.A trolley is pulled forwards with 26 N while friction acts backwards with 9 N. What is the net (resultant) force?
- 2.The trolley (26 N pull, 9 N friction): are the forces balanced or unbalanced?
- a) balanced
- b) unbalanced
- 3.A boat motor pushes forwards with 550 N and the water drags backwards with 550 N. What is the net (resultant) force?
- 4.The boat (550 N each way): are the forces balanced or unbalanced?
- a) balanced
- b) unbalanced
- 5.A car engine drives a car forwards with 2400 N while air resistance and friction push backwards with 900 N. What is the net (resultant) force?
- 6.The car (2400 N drive, 900 N drag): are the forces balanced or unbalanced?
- a) balanced
- b) unbalanced
- 7.A student pushes a crate forwards with 45 N while friction pushes it backwards with 18 N. What is the net (resultant) force?
- 8.The crate (45 N push, 18 N friction): are the forces balanced or unbalanced?
- a) balanced
- b) unbalanced
- 9.Weight = mass x gravitational field strength. On Earth the field strength is 9.8 N/kg. What is the weight of a 6 kg object there?
- 10.Weight = mass x gravitational field strength. On Earth the field strength is 9.8 N/kg. What is the weight of a 2.5 kg object there?
- 11.Two forces act on a box in opposite directions and are unbalanced. In which direction does the box accelerate?
- 12.Which instrument measures the size of a force?
- 13.A skydiver falls at a steady speed. Are the forces on the skydiver balanced or unbalanced?
- a) balanced
- b) unbalanced
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