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Force Diagrams and Net Force — Free MYP2 Sciences Practice Questions
1QuestionCalculating Net Force on an ObjectConcept Practice
2 marks~3 minCriterion A
A box is pushed to the right with an applied force of . At the same time, friction (a force that opposes motion) acts to the left with a force of .
a
Identify the two forces acting on the box and state their directions. [1]
b
Calculate the net force (the overall combined force) acting on the box. Include its size and direction. [1]
Solutions
2QuestionDrawing and Labeling Force DiagramsAssessment Practice
5 marks~8 minCriterion C
A student draws a force diagram for a toy car being pushed across a rough carpet. The diagram shows only two forces: a push force pointing right and the weight of the car pointing downward.
a
Identify two forces missing from the student's diagram. [1]
b
Explain how leaving out these two forces makes the diagram less useful for predicting the car's motion. [2]
c
Describe one real-world situation where ignoring friction in a force diagram could lead to a safety problem. Explain the likely consequence. [2]
Solutions
3QuestionCalculating Net Force on an ObjectAssessment Practice
6 marks~9 minCriterion D
A rugby player of mass 80 kg is tackled by two opponents at the same time. One opponent pushes the player forward with a force of 450 N. The other pushes the player backward with a force of 300 N.
a
Calculate the net force (the combined effect of both forces) acting on the player and state its direction. [2]
b
Using Newton's second law (), calculate the acceleration of the rugby player. Show your working. [2]
c
Explain one way that understanding net force and acceleration could help make rugby tackles safer, and identify one limitation of using physics alone to prevent injuries. [2]
Solutions
4QuestionEffect of Net Force on Acceleration and SpeedAssessment Practice
7 marks~11 minCriterion B
Three objects — A, B, and C — each have a mass of 2 kg. The speed–time graph below shows how each object speeds up over 4 seconds.
a
Calculate the acceleration of each object using the graph. [3]
b
Calculate the net force acting on each object using , where is force (N), is mass (kg), and is acceleration (m/s²). [2]
c
Compare the net force and acceleration values for A, B, and C. What pattern do you notice? [2]
Solutions
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