Balanced Forces If the forces on an object are balanced it will either remain stationary or move at the same speed in the same direction. A stationary.

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Presentation transcript:

Balanced Forces If the forces on an object are balanced it will either remain stationary or move at the same speed in the same direction. A stationary object will have two equal and opposite forces acting on it; its weight and the upwards force (reaction) from the surface. Balanced forces

Forces on a car Forces on a car

Forces Forces

Balanced Forces Balanced Forces

Unbalanced Forces If the forces on an object are unbalanced it will either speed up, slow down, change shape or change direction. The greater the unbalanced force, the greater the change in speed, direction or shape. Unbalanced forces

Unbalanced forces Unbalanced forces

Balanced & Unbalanced forces

Balanced & Unbalanced forces

A skydiver will initially accelerate due to the force of gravity. Terminal Velocity A skydiver will initially accelerate due to the force of gravity. Air resistance increases until it balances the gravitational forces. When the forces are balanced the skydiver will have reached terminal velocity. Terminal Velocity

Sky diving Sky diving

Sky diving Sky diving

Inertia is the reluctance of an object to change its speed. The heavier an object, the greater the unbalanced force needed to accelerate it or decelerate it. Inertia

Inertia Inertia

Friction is a force which acts when two objects are rubbed together. Friction acts in the opposite direction to movement. Friction causes objects to heat up and also causes their surfaces to wear away. Car tyres could not grip the road without friction. Friction is used in brakes. Friction

Friction Friction

Friction Friction

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