1. The average speed of a horse that gallops a distance of 10 km in a time of 30 mn is:
A. 10 km/h
B. 20 km/h.
C. 30 km/h.
D. more than 30 km/h.
2. What is the acceleration of a car that maintains a constant velocity of 100 km/h for 10 seconds?
B. 10 km/h/s.
D. 1000 km/h/s.
3. An object weighs 30 N on earth. A second object weighs 30 N on the moon. Which has the greater mass?
A. the one on earth.
B. the one on the moon.
C. they have the same mass.
D. not enough information to say
4. When a woman stands at rest with two feet on a scale. The scale reads 500 N. When she gently lifts one foot, the scale reads:
A. 250 N.
B. 500 N.
C. 1000 N.
5. A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force is:
A. 1000 N.
B. 2000 N.
C. 3000 N.
D. 4000 N.
6. Any quantity that is capable of producing motion is called?
A. a mass
B. a force
C. angular momentum
D. a fundamental quantity
7. One newton is defined as
(a) the force between two 1-kilogram masses 1 meter apart.
(b) force exerted by the Earth on a 1-kilogram mass.
(c) force needed to accelerate a 1-kilogram mass at a rate of 1 m/s2.
(d) weight of 1 cubic meter of pure water.
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