Physics 101
Homework #3
1) A body of mass 8 kg accelerates under the action of a force. The same force applied to a second body produces 2 times the acceleration. What is the mass of the second body?
a) 2 kg b) 4 kg c) 12 kg d) 16 kg e) 32 kg
2) A body of mass 6 kg accelerates under the action of a force. A second body requires 1/2 the force to produce the same acceleration as the first. What is the mass of the second body?
a) 18 kg b) 12 kg c) 6 kg d) 3 kg e) not enough info
3) A net force of 64 Newtons acts on a mass of 16 kg. The resulting acceleration is
a) 16 m/s2 b) 510 m/s2 c) 64 m/s2 d) 8 m/s2 e) 4 m/s2
4) A 200 kg motorcycle accelerates at 0.02 m/s2. What force produced this acceleration?
a) 40 N b) 4.0 N c) 1000 N d) .01 N
5) An 80 kg man on ice skates pushes a 40 kg boy also on skates with a force of 25 N. The force exerted by the boy on the man is
a) 200 N b) 100 N c) 50 N d) 25 N e) 0 N, unless the boy pushes back
6) Your weight is
a) actually your mass b) a property of mechanical equilibrium
c) The gravitational attraction between you and the earth d) all of these
e) none of these
7) An apple weighs 1 Newton. When held at rest above your head, the net force on the apple is
a) -1N b) 0.1 N c) 1 N d) 0 N
8) A push on a 1 kg brick accelerates the brick. Neglecting friction, to equally accelerate a 100 kg brick requires
a) just as much force b) 10 times as much force c) 100 times the force d) one tenth the force
9) A karate chop delivers a blow of 3000 N to a board that breaks. The force that acts on the hand during the strike is
a) less than 3000 N b) 3000 N c) more than 3000 N d) not enough info
10) A mosquito strikes the windshield of your car while driving on the Lloyd. The resulting acceleration of the mosquito is
a) equal to the acceleration of the car b) more than the acceleration of the car
c) less than the acceleration of the car d) not enough info