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Force

Force problem 1

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The table below describes events in which a force acts on one of the bodies described. Answer the questions on the columns for each event.

Event	On which body does the force act?	What do we call that force?	How do we know that a force acts on the body?
A car starts at a green light on a traffic light.
A brick breaks when it falls to the ground.
A child shapes a plasticine doll.
A snow avalanche starts on the hill and rushes into the valley with increasing speed.
A magnet attracts a needle on the ground.
We hold a spring in our hands and stretch it.
A child rotates on the hanging carousel seat.
We fill a balloon with air from the lungs.

material editor: Gabriel Amakhabi

Event	Which body is affected by force?	What do we call that force?	How do we know that a force acts on the body?
A car starts at a green light on a traffic light.	The car.	Engine force.	The stationary car starts moving.
A brick breaks when dropped to the ground.	The brick.	Tension.	The speed of the brick has changed (the brick has stopped) and its shape has also changed (the brick has broken).
A child shapes a plasticine doll.	The plasticine.	Force.	The shape of the plasticine is changed.
A snow avalanche starts on the hill and drifts into the valley with increasing speed.	The snow.	Snow weight.	When the avalanche breaks off, the snow starts to move. As it drifts into the valley, its speed increases.
Magnet attracts a needle on the ground.	The needle.	Magnetic force.	The stationary needle starts moving towards the magnet.
We hold a spring in our hands and stretch it.	The spring.	Force of the hand.	When we stretch the spring, we change its shape.
A child rotates on the hanging carousel seat.	The child.	Force (to where the seat is attached).	During rotation, the direction of the child's movement is constantly changing as he moves in a circle.
We fill a balloon with air from the lungs.	The balloon.	Force of the pectoral muscles (with which we compress air from the lungs into a balloon).	When the balloon inflates, its shape changes and its volume increases.