Physics 221 Worksheet: Chapter 6, Work and Energy
1) The product of force times distance is
a) kinetic energy.
b) potential energy.
c) work.
d) power.
2) The rate at which work is done is called
a) kinetic energy.
b) potential energy.
c) force.
d) power.
3) If an object is moving it possesses
a) kinetic energy.
b) potential energy.
c) work.
d) power.
4) Which of the following statements is true for a pine cone falling with acceleration less than g?
a) It is converting potential and kinetic energy into heat.
b) It is converting potential energy into kinetic energy and heat.
c) It is converting potential energy into heat only.
d) It is converting potential energy into kinetic energy only.
5) A light car and a heavy truck have the same kinetic energy.
a) They both have the same speed.
b) The car is going faster than the truck.
c) The car is going slower than the truck.
6) A car is traveling twice as fast as a truck. The car has half the mass of the truck.
a) Both have the same kinetic energy.
b) The car has more kinetic energy than the truck.
c) The truck has more kinetic energy than the car.
7) Car A has twice the mass of car B. Both are initially at rest. Equal forces act on each car for equal distances. At the end:
a) Car A has more kinetic energy than car B.
b) Car A has less kinetic energy than car B.
c) Car A is traveling faster than car B.
d) Car A is traveling slower than car B.
e) Cars A and B are travelling at the same speed.
8) The form of energy produced by sliding friction is
a) kinetic.
b) potential.
c) gravitational.
d) thermal.
9) An object’s kinetic energy change is equal to
a) its loss of potential energy.
b) the total work done to it.
c) the heat produced by its motion.
Ans: 1-c, 2-d, 3-a, 4-b, 5-b, 6-b, 7-d, 8-d, 9-b
Physics 221 Worksheet: Chapters 6 and 7, Energy and Momentum
1) A 2000 kg car and a 4000 kg truck have the same momentum.
a) They both have the same speed.
b) The car is moving faster than the truck.
c) The car is moving slower than the truck.
2) A 2000 kg car and a 4000 kg truck have the same kinetic energy.
a) They both have the same momentum.
b) The car has more momentum than the truck.
c) The car has less momentum than the truck.
3) Equal forces act for equal time on a 2000 kg car and a 4000 kg truck, both initially at rest.
a) Afterwards each will have the same momentum.
b) Afterwards each will have the same kinetic energy.
c) Afterwards each will have the same velocity.
4) Equal forces act over equal distances on a 2000 kg car and a 4000 kg truck, both at rest.
a) Afterwards each will have the same momentum.
b) Afterwards each will have the same kinetic energy.
c) Afterwards each will have the same velocity.
5) During an inelastic collision
a) momentum is conserved but kinetic energy is not.
b) kinetic energy is conserved but momentum is not.
c) both kinetic energy and momentum are conserved.
d) neither kinetic energy nor momentum are conserved.
6) During a perfectly elastic collision
a) momentum is conserved but kinetic energy is not.
b) kinetic energy is conserved but momentum is not.
c) both kinetic energy and momentum are conserved.
d) neither kinetic energy nor momentum are conserved.
7) The product of force times time is called
a) work.
b) energy.
c) momentum.
d) impulse.
8) An open freight car rolls without friction on a horizontal track as rain falls vertically into the car. As water accumulates in the car its speed
a) increases.
b) decreases.
c) remains the same.
9) During an inelastic collision
a) all the initial kinetic energy is lost.
b) at least some of the initial kinetic energy is lost.
c) none of the initial kinetic energy is lost.
10)A car moves down a hill, arriving at the bottom going more slowly than at the top.
a) Potential energy was converted into kinetic energy and heat.
b) Kinetic energy was converted into potential energy and heat.
c) Potential energy and kinetic energy were converted into heat.
Ans: 1-b, 2-c, 3-a, 4-b, 5-a, 6-c, 7-d, 8-b, 9-b, 10-c