More Problems on Force and Acceleration

S7 A car having a mass of 500 kg is initially traveling with a speed of 80 km/hr.
a.) The car has a constant acceleration while braking. It takes 4 seconds to come to a stop. What is its acceleration?
b.) What is the net force on the car while it's braking?
c.) Where is the force applied?
d.) What is the distance the car travels before it stops?
S8 A 1 kg ball is dropped from the top of a cliff and falls with a constant acceleration due to gravity (9.8 m/s2).
a.) How fast is the ball going after 4 seconds?
b.) How far has the ball gone after 4 seconds?
c.) What is the force on ball?
S9 A 1 kg ball is thrown straight upward with an initial velocity of +15 m/s (NOTE: the positive direction is upwards).
a.) How much time does it take for the ball to reach the ground again?
b.) What is the ball's velocity just before reaching the ground?
c.) What is the force on ball while it is going upward?
d.) What is the force on ball when it has reached its maximum height above the ground?

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Last updated: 6 Sep 1999
Comments: bland@indiana.edu