SCIM1040 Lecture Notes - Lecture 4: Bowls, Seat Belt, Gas Giant

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SCIM1040- Lecture 4
Forces make things: begin to move, stop moving, change direction, speed up, slow down, or change
shape.
If an object is moving it would tend to keep moving in the same direction at the same speed and if
an object is stationary it would tend to stay that way.
Examples of Inertia:
A car suddenly stops and you strain against the seat belt.
While standing in the aisle of a school bus, the bus suddenly brakes and you keep moving down the
aisle.
When riding a horse, the horse suddenly stops and you fly over its head.
The magician pulls the tablecloth out from under a table full of dishes.
The difficulty of pushing a broken-down car.
Lawn bowling on a cut and rolled lawn versus an uncut lawn.
A car turns left and you appear to slide to the right.
Gravity
It was not until the insights of Einstein with his General and Special relativity was the cause of gravity
given an explanation.
Is the mass or weight of a body affected by the force of gravity?
The greater the mass of an object and the greater the gravity acting on it, the greater will be the
weight of the object.
So, even though your body mass stays the same, you will weigh less on the Moon because of its
smaller force of gravity but you will have a greater weight on Jupiter if you could walk on this large,
gas planet.
Inclined Plane
Roads are also inclined planes. Instead of going straight up over a mountain, roads go up at small
angles, like the picture to the left.
Wedge
Wedges that split: Axe, Fork, Paint scraper.
Wedges that cut: Saw, Knife, Scissor blades, Bow of a boat
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Document Summary

Forces make things: begin to move, stop moving, change direction, speed up, slow down, or change shape. If an object is moving it would tend to keep moving in the same direction at the same speed and if an object is stationary it would tend to stay that way. A car suddenly stops and you strain against the seat belt. While standing in the aisle of a school bus, the bus suddenly brakes and you keep moving down the aisle. When riding a horse, the horse suddenly stops and you fly over its head. The magician pulls the tablecloth out from under a table full of dishes. Lawn bowling on a cut and rolled lawn versus an uncut lawn. A car turns left and you appear to slide to the right. It was not until the insights of einstein with his general and special relativity was the cause of gravity given an explanation.

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