Questions:
1. Inertia.
2 Weight depends on gravity, while mass does not.
3 Your weight is greater on the Earth because of its stronger gravity. Your mass is the same at all locations.
4 Newtons for weight, kilograms for mass.
5 Both magnitude and direction.
6 Tension.
7 F 0 means that the vector sum of all the forces that act on an object in equilibrium equal zero.Forces cancel.
8 Because it acts at right angles to the surface. Normal is another term for “right angle.”
9 The same. You actually read the support force by the scale, which is the same as your weight when the scale is stationary.
10 It is in equilibrium if its velocity is not changing.
11 Because it slides in equilibrium (constant velocity), we know the friction must be equal and opposite to our push. That way, they cancel, and the crate slides without changing speed.
12 Opposite, always.
13 To the left.
14 Yes, opposite to your push, just enough so that F 0.
15 speed distance/time
16 Velocity involves both magnitude (speed) and direction. Speed involves only magnitude.
17 Instantaneous speed.
18 You can be at rest relative to the Earth but moving at 100,000 km/h relative to the sun.