Originally Posted by

**bradycat** I am trying to figure this out and having problems solving it.

Q#1

Calculate the mass in grams for an object whose weight is 33.0 N

Total of mass in grams?

**W = mg**. You have W = 33N and g = 9.8m/sē. So you can easily calculate mass(m). But in this formula, mass is in kg. 1000g = 1kg. kilo is the prefix meaning 'a thousand'. Should be an easy conversion.

Q#2

Calculate the acceleration of an object whose mass is 5.26 tonne if an unbalanced force of 285 kN is pushing this object.

Answer of acceleration?

**F = ma**. First convert your data into standard SI units. F = 285 kN = 285 000 kN. m = 5.26 tonnes = 5260 kg.

Q#3

a 30 kg block with an initial velocity of 10m/s due west slides 15m along a rough level floor and comes to rest. It takes 3 seconds to stop. The stopping force on the block is??

**Once again, F = ma. **

You only have mass for now and need to find acceleration to calculate the force. Assuming acceleration (a) is constant, use the formula **d = Ut + 0.5atē** where d = distance, U = initial velocity, and t = time taken.

Q#4

A hockey puck is set in motion across a level frozen pond. If the frictional forces are neglected, the force required to keep the puck sliding at a constant velocity is

A> 0 newtons

B> equal to the weight of the puck

C> the weight of the puck divided by its mass

D> the mass of the puck multiplied by 9.81 m/s^2

E> none of the above.

**Newton's First Law of Motion (Intertia)**: In the absence of force, a body either is at rest or moves in a straight line with constant speed.

THANKS for your help

PLEASE show all work so I can figure it out.

Jo