1. Forces and newton’s Laws
Practice Problems
Send the tallest person in your group to grab whiteboard and marker box
Make sure you have at least 2 people at your table group!

2. #1
A Saturn V rocket has a mass of 2.75 x 106 kg and exerts a force of 3.30 x 107 N on the gases it expels.
A. What is the net force acting on the rocket upon liftoff?
B. What is the initial vertical acceleration of the rocket?

3. #2
Anna is pushing Olaf on a sled across a flat, snow-covered patio. The coefficient of static friction between the sled and the snow is The coefficient of kinetic friction between the sled and the snow is Olaf has a mass of 12.5 kg, and Anna is pushing down on the sled with a force of 55 N at an angle of 30.0° from the horizontal.
Will Olaf and his sled begin to move?
With what force must Anna push Olaf once he’s moving in order to keep him moving with a constant velocity?

4. #3
Sally, m = 45.0 kg, is sitting on a sled that has a mass of 3.5 kg. The coefficient of static friction between the sled and the snow is If Linus is pulling at an angle of 35.0° to the horizontal, what force would he need to apply in order to start Sally and her sled moving?
If Linus keeps pulling with that same force, what is the acceleration of Sally and her sled? Assume the coefficient of kinetic friction is 0.08.

5. #4
A skier has just begun sliding down a 30.0° incline. Assume the coefficient of kinetic friction between her skis and the snow is What is her final velocity after skiing for 4.0 s?

6. #5
An Olympic skier coasts down a slope with an angle of inclination of 37°.(a) Neglecting friction, how many forces act on the skier?  
  (b) What is the acceleration of the skier?  
  (c) If the skier has a speed of 5 m/s at the top of the slope, what is his speed when he reaches the bottom of the 35 m long slope?