Worksheet 6 Gravity
Fill in the blank spaces

Gravity is a "a). .force"
which acts on objects without
b). ..them. Gravitational
force c). .(attracts/repels)
every object in the Universe.
Gravity is what makes everything near the
Earth d. . Gravity holds
the Earth in orbit around the e).
and holds all the stars together in a
f)
Gravity pulls on everything which has
g) . This is the amount matter
in an object, measured in units of h).
Your weight is the i).
..due to
j). ..pulling on your mass.
The k)...
...of any object stays the
same, but its 1). .changes
depending on where it is.

What must be the same for any two resistors that are connected in series ? a. the potntial diffrence across each b. the rate at which charge moves through each c. the rate at which energy is used by each d. the resistance to the flow of charge of each

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".

Astone is dropped from the upper observation deck of a tower, 250 m above the ground. (assume g = 9.8 m/s2.) (a) find the distance (in meters) of the stone above ground level at time t. h(t) = (b) how long does it take the stone to reach the ground? (round your answer to two decimal places.) s (c) with what velocity does it strike the ground? (round your answer to one decimal place.) m/s (d) if the stone is thrown downward with a speed of 2 m/s, how long does it take to reach the ground? (round your answer to two decimal places.) s