Mechanics - Forces | Olly Britton

Forces

Weight and the normal reaction

What is the weight of an object?

weight-definition

The force acting vertically downwards.

What is the normal reaction?

normal-reaction-definition

The force acting perpendicular from a surface when an object is in contact with the surface.

What is the normal reaction the same as?

normal-reaction-equals-weight

The weight of an object on a surface.

What is the name of the force acting perpendicular from a surface on an object resting on the surface?

perpendicular-surface-force-name

The normal reaction.

Friction

What is friction?

friction-definition

The force which opposes the motion between two rough surfaces.

What is the force called which opposes the motion between two rough surfaces?

friction-name

Friction.

Tension and thrust

What is the force of tension?

tension-definition

The force exerted by a rope/string/wire on an object.

What is the special name for the contact force for a rope or string?

tension-name

Tension.

What is the force of thrust/compression?

thrust-definition

The force exerted by a light rod on an object.

If the “rope force” is tension, then the “rod force” is…?

rope-tension-rod-thrust

Thrust/compression.

If the “rod force” is thrust/compression, then the “rope force” is…?

rod-thrust-rope-tension

Tension.

Buoyancy and air resistance

What is buoyancy?

buoyancy-definition

The upward force on a body that allows it to float in a liquid.

The force allowing a body to float in a liquid is called?

buoyancy-name

Buoyancy.

What is air resistance?

air-resistance-definition

The force of friction when an object moves through the air.

Equilibrium

What is a static equilibrium?

static-equilibrium-definition

Where the net force is zero and a particle is at rest.