End-of-chapter questions 1
Read the following sentence: A force can make an object change direction, slow down, or speed up. Copy the sentence, changing the words in italics to the correct scientific terms.
S
2
An object may be acted on by several forces. What name is given to the single force that has the same effect as these forces?
3
What name is given to the force on an object caused by the Earth’s gravitational pull?
4
A force causes an object with mass to accelerate. a Write the equation that links the quantities force, mass and acceleration. b Copy the table and complete the second column, to show the three quantities and their units. Quantity
Unit
Scalar or vector?
mass acceleration force
c In the third column, state whether each quantity is a scalar or a vector. 5
A car is travelling around a circular track at a steady speed. A force causes it to follow the track. What is the angle between this force and the car’s velocity? Draw a diagram to illustrate your answer.
6
The diagram shows the forces acting on a table tennis ball as it falls.
a b c d
48
Copy the diagram and label the force arrows weight and air resistance. The two forces are equal but opposite. What is the resultant force acting on the ball? Explain why the ball falls at a steady speed. What name is given to this steady speed?
Cambridge IGCSE Physics
Original material Š Cambridge University Press 2014