SAMPLE LESSONS > O LEVEL DYNAMICS
NEWTON’S LAW
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NEWTON’S FIRST LAW
NEWTON’S SECOND LAW
WORKED EXAMPLES
EASY
a) A car has a mass of 2.0×10³ kg. The resultant force created by the engine is 3.0×10³ N. Calculate the acceleration caused by this force.
b) A man applies a force of 50 N to move a carton of mass 10 kg at a constant speed. What is the frictional force exerted by the floor?
Answer
MEDIUM
a) In the following diagrams, calculate the resultant force.
b) Draw and state the magnitude of another force acting on the object to give a resultant force 40 N as indicated on the diagram.
Answer
HARD
A box with a mass 5.0 kg is pushed on the floor as shown below.
The force applied by the man is 20.0 N. The frictional force exerted by the floor is 12.0 N. Find the acceleration of the box.
Answer
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