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Force Diagrams and Net Force — Free MYP3 Sciences Practice Questions
1QuestionCalculating Net Force on an ObjectConcept Practice
2 marks~3 minCriterion A
A box is acted on by two horizontal forces: 5 N to the left and 3 N to the right.
a
Calculate the magnitude of the net force acting on the box. [1]
b
State the direction of the net force. [1]
Provide your answers in the following format:
Magnitude (N): ___
Direction: ___
Provide your answers in the following format:
Magnitude (N): ___
Direction: ___
Solutions
2QuestionCalculating Net Force on an ObjectAssessment Practice
3 marks~5 minCriterion D
A playground designer is testing a swing set. One swing chain is pulled horizontally by two children pushing off the ground at the same time, each exerting a horizontal force of 50 N in the same direction. The manufacturer states each chain can safely hold a maximum force of 120 N.
a
Calculate the net horizontal force acting on the chain. [1]
b
Explain one limitation of using an average value of 120 N as the safe maximum force for all chains. [1]
c
The engineer designs the chain to withstand 200 N. Explain why designing for a force greater than the expected maximum makes the swing set safer. [1]
Solutions
3QuestionCalculating Net Force on an ObjectAssessment Practice
5 marks~8 minCriterion C
A cart of mass is pulled along a frictionless track by a hanging mass attached over a pulley. The table below shows five trials with different hanging masses and the measured acceleration of the cart.
A student claims: "The net force on the cart equals the weight of the hanging mass."
| Hanging mass (kg) | 0.020 | 0.040 | 0.060 | 0.080 | 0.100 |
|---|---|---|---|---|---|
| Measured acceleration (m/s²) | 0.38 | 0.78 | 1.15 | 1.52 | 1.88 |
A student claims: "The net force on the cart equals the weight of the hanging mass."
a
Calculate the net force acting on the cart in each trial using . [2]
b
Calculate the weight of the hanging mass in each trial using , where . [1]
c
Compare your results from (a) and (b) and evaluate whether the data supports the student's claim. [2]
Solutions
4QuestionDrawing and Labeling Force DiagramsAssessment Practice
6 marks~9 minCriterion B
The table below shows the net force, mass, and acceleration of four objects.
| Object A | Net force = 10 N | Mass = 2 kg | Acceleration = 5 m/s² |
|---|---|---|---|
| Object B | Net force = 10 N | Mass = 5 kg | Acceleration = 2 m/s² |
| Object C | Net force = 20 N | Mass = 2 kg | Acceleration = 10 m/s² |
| Object D | Net force = 20 N | Mass = 4 kg | Acceleration = 5 m/s² |
a
Apply the pattern in the data to write a formula linking net force (), mass (), and acceleration (). [2]
b
Calculate the acceleration of Object E, which has a net force of 15 N and a mass of 3 kg. Show your working. [2]
c
Objects A and C have the same mass but different net forces. Analyse how changing the net force affects acceleration, using values from the table to support your answer. [2]
Solutions
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