When a car goes around a circular curve on a level road without slipping,
A. no frictional force is needed because the car simply follows the road.
B. the frictional force of the road on the car increases when the car's speed decreases.
C. the frictional force of the road on the car increases when the car's speed increases.
D. the frictional force of the road on the car increases when the car moves to the outside of the curve.
E. there is no net frictional force because the road and the car exert equal and opposite forces on each other.
Answer: C
You might also like to view...
Power is
a. work divided by time. b. velocity multiplied by time. c. momentum divided by time. d. energy multiplied by time.
A 15-?F capacitor is connected to a 50-V battery and becomes fully charged. The battery is removed and a slab of dielectric,
having a dielectric constant of 5.0, is inserted between the plates and completely fills the space between them. (a) What is the capacitance of the capacitor after the slab is inserted? (b) What is the potential difference across the capacitor with the dielectric inserted.
A 0.20-kg object attached to the end of a string swings in a vertical circle (radius = 80 cm). At the top of the circle the speed of the object is 4.5 m/s. What is the magnitude of the tension in the string at this position?
a. 7.0 N b. 2.0 N c. 3.1 N d. 5.1 N e. 6.6 N
The sensitive dependence upon initial conditions of the evolution of some physical systems is a feature of __________
Fill in the blank(s) with correct word