Chapter 5: Newton's Laws of Motion
Warm-Ups




1.  

The word "push" is reasonably good synonym for the word FORCE.

Is "hold" a synonym for force?

How about "support"?

How many others can you think of?



2.  

The engine on a fighter airplane can exert a force of 105,840 N (24,000 pounds).

The take-off mass of the plane is16,875 kg. (It weighs 37,500 pounds.)

If you mounted this aircraft engine on your car, what acceleration would you get? (Please use metric units. The data in pounds are given for comparison. Use a reasonable estimate for the mass of your car. A kilogram mass weighs 2.2 pounds.)



3.  

A 72 kg skydiver is descending on a parachute. His speed is still increasing at 1.2 m/s2.

What are the magnitude and direction of the force of the parachute harness on the diver?

What are the magnitude and direction of the net force on the diver?



4.  

Suppose you run into a wall at 4.5 meters per second (about 10 mph). Let's say the wall brings you to a complete stop in 0.5 second.
Find your deceleration and estimate the force (in newtons) that the wall exerted on you during the stopping.
Compare that force to your weight.


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