In the following situations identify the agent exerting the force and the object on which it acts .State the effect and kind of force in each case.
a>Falling of rain drops.
b>A horse pulling a cart.
c>A car coming to rest once its engine is switched off.
d>The rivers flow down to sea.
a - gravity down, air friction up
b - friction force exerted on roadway by horseshoe, equal and opposite force exerted by horseshoe on roadway, horse then exerts pull on shaft, shaft pulls back on horse and forward on cart, roadway exerts friction force back on cart
c - friction from air and roadway slows car
d - gravity
a> Falling of raindrops:
- Agent exerting force: Gravity
- Object on which it acts: Raindrop
- Effect: The raindrop is accelerated downwards due to the force of gravity.
- Kind of force: Gravitational force
b> A horse pulling a cart:
- Agent exerting force: The horse
- Object on which it acts: The cart
- Effect: The cart moves forward in the direction of the force applied by the horse.
- Kind of force: Tensile force or pulling force
c> A car coming to rest once its engine is switched off:
- Agent exerting force: Friction
- Object on which it acts: The car's wheels or tires
- Effect: The friction between the tires and the road surface slows down the car until it comes to rest.
- Kind of force: Frictional force
d> The river flowing down to the sea:
- Agent exerting force: Gravity
- Object on which it acts: Water in the river
- Effect: The force of gravity pulls the water downstream, causing the river to flow towards the sea.
- Kind of force: Gravitational force