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Forces and Motion:

Representing motion:

The slope on a distancetime graph represents the speed of an object. The velocity of an object
is its speed in a particular direction. The slope on a velocitytime graph represents the
acceleration of an object. The distance travelled is equal to the area under…

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directions have different velocities. The vertical axis (yaxis) of a velocitytime graph is the velocity
of the object. The horizontal axis (xaxis) is the time from the start.
When an object is moving with a constant velocity, the line on the graph is horizontal. When an
object is moving with…

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The gradient of a line on a distancetime graph represents the speed of the object.
1) What is the speed represented by the blue line?
The object travels 10m in 2s.
Its speed is 10 ÷ 2 = 5m/s.

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Velocitytime graphs:

The gradient of a line on a velocitytime graph represents the acceleration of the object.
1) What is the acceleration represented by the sloping line?
The object increases its velocity from 0m/s to 8m/s in 4s.
Its acceleration is 8 ÷ 4 = 2m/s2.

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the gradient of a velocitytime graph represents the acceleration
the area under a velocitytime graph represents the distance covered

The area under the line in a velocitytime graph represents the distance travelled. To find the
distance travelled in the graph above, we need to find the area of the lightblue…

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3) Area under the whole graph

The area of the lightblue triangle plus the area of the darkblue rectangle is:
16 + 48 = 64m.
This is the total area under the distancetime graph. This area represents the distance
covered.


Forces. Masses and Acceleration:

A stationary object remains stationary if…

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Forces and acceleration:

An object will accelerate in the direction of the resultant force. The bigger the force, the greater the
acceleration. Doubling the size of the (resultant) force doubles the acceleration.
An object will accelerate in the direction of the resultant force. A force on a large mass will…

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3) Put in the values.

o Acceleration = 3,000N 2,000kg

4) Work out the answer and write it down.

o Acceleration = 1.5m/s2




Here are four typical forces on which you could be asked questions:

1) Air resistance (drag): When an object moves through the air, the force of air…

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the car along. Also, there is friction between the road and the tyres. There is friction in the wheel
bearings. And air resistance acts on the front of the car.



Weight and friction:

Gravity is a force that attracts objects with a mass towards each other. The weight of an…

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Falling objects:

You should be able to describe the forces affecting a falling object at different stages of its fall.
Usually, you need to think about two forces:

1) The weight of the object This is a force acting downwards caused by the object's mass and
the Earth's gravitational field.…

Comments

rgs.himanshu

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Well developed and concise. Useful for students for revision before they begin Past paper Solving

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