P3 test

Work Done = force x distance

Speed = distance / time

Acceleration = change in velocity / time

Force = mass x acceleration

weight = mass x gravity

Momentum = mass x velocity

(p = mv)

change in momentum = force x time

The blue shaded area is the distance travelled. this can be very helpful in a test, as you just need to calculate the area of the blue shaded rectangular section.

A force is any influence that causes an object to undergo a specific change.

Newton’s First Law of Motion states that objects with balanced forces acting on them will stay at rest or stay in constant motion.

Newton discovered that objects will continue to do what they are doing until an unbalanced force acts on the object. From this we can determine that:

• forces act on objects
• forces cause changes

We can also determine that forces acting on an object can change the shape of the object, the speed of the object, and the direction in which the object is moving.

Newton’s Second Law of Motion states that when an unbalanced force acts on an object:

• the direction of the object's acceleration is the same as the direction of the unbalanced force
• the magnitude of the object's acceleration varies in direct proportion with the size of the unbalanced force
• the magnitude of the object's acceleration varies inversely with the mass of the objectThe unit of force is called the newton (N).1 newton is defined as that unbalanced force which produces an acceleration of 1 m/s² when it acts on a mass of 1 kg. An average-sized apple weighs about 1 newton.  Newton's Second Law of Motion can be written as the following relationship:
• F = ma

where:

F = unbalanced force

m = mass

a = acceleration

Friction is a force that opposes motion.

An object may have several different forces acting on it, which can have different strengths and directions. But they can be added together to give the resultant force. This is a single force that has the same effect on the object as all the individual forces acting together.