Objects can interact in many ways. Pairs of forces arise when objects interact.
Write down one type of force involved when objects interact.
A book rests on a table.
Draw a free body force diagram to show the forces acting on the book.
Use arrows to represent the forces.
A teacher uses an air-track for motion experiments. Using the air-track means that there is no friction between the glider and the air-track.
The teacher places the glider on the horizontal air-track and gives it a small push to start it moving.
Explain the motion of the glider.
A presenter on a car TV programme says:
“The car maker has reduced the mass of this car and it now has better acceleration.”
[2]
Calculate the acceleration of the car.
Use the equation: Acceleration = Change in speed ÷ Time taken
Answer = ................................................. m/s2 [3]
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Look at these regions of the graph: