Chapter 10 Covered with key definitions and explanations

Mechanics
Forces and motion
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, Prior Knowledge Check
1) Calculate 3) A car starts from rest and
5𝒊−3 𝒋 accelerates constantly at 1.5ms-2.
a)
a) Work out the velocity of the
b) − 4𝒊+4 𝒋 car after 12 seconds
−1
2) The diagram shows a right- 18 𝑚 𝑠
angled triangle. Work out the
length of the hypotenuse and
the size of angle , correct to
After the 12 seconds, the driver
1dp.
brakes, causing the car to
decelerate at a constant rate of
1ms-2
19.2𝑐𝑚 b) Calculate the distance the car
12cm travels from the instant the
driver brakes until the car comes
38.7𝑎 to rest.

15cm
162𝑚

,Teachings For
Exercise 10A

, Forces and motion
A force diagram is a diagram
𝑅
showing all the forces acting on
an object
𝐹 𝑃
 Whenever you have to solve a
problem involving forces, you
should fully draw and label a 𝑊
force diagram.

If the horizontal plane was smooth…
A block of weight is being pulled to
the right by a force , along a rough 𝑅
horizontal plane. Draw a force
diagram to show all the forces
acting on the block.
𝑃

𝑊

10A