What does Newton's first law say that object will tend to do?
If a moving object is losing momentum as time passes, then what does Newton's second law tells us is acting on the object?
____________________ Calculate the force required to bring a marble with a momentum p of 210 g cm/s to a stop in 0.5 seconds.
____________________ When all 67 kilograms of me falls off a RipStik, I accelerate towards the ground at 9.8 m/s² and then I hit the ground, exerting a force of 1400 Newtons on the ground. Calculate the counter-force that the ground exerts on me.
____________________ An elastic band stretches (displaces) a distance x of 5 cm when a 70 gram-force force f is applied. Calculate Hooke's constant k for the elastic.
____________________ Presume that the elastic band in the above problem is Hookean, that is, it is a linear elastic material. What will be the displacement x when a 210 gram-force force f is applied?
A RipStik carrying a 32 kilogram rider accelerates from
a speed of 1.6 m/s at 4.0 seconds
to a speed of 2.0 m/s at 6.0 seconds.
Calculate and write the acceleration of the RipStik and force required to generate that acceleration in the table.
time (s)
velocity (m/s)
acceleration (m/s²)
Force (N)
4.0
1.6
6.0
2.0
Equations
[ d = ѵt ]
[ ѵ = at ]
[ d = ½at² ]
[ d = ½gt² ]
[ ]
[ p = mѵ ]
[ GPE = mgh ]
[ KE = ½mѵ² ]
[ ]
[ F = ma ]
[ F = −kx ]