Physics & Astronomy
Physics for Scientists and Engineers Study Set 1
Quiz 4: Newtons Laws
A Body of Weight W Rests on the Surface of Earth
A body of weight w rests on the surface of Earth. What force does the body exert on Earth? (ignore Earth's rotation) A) w B) greater than w C) less than w D) 9.81w E) zero
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A girl walks on a level floor in a straight line in the +x direction. Her foot exerts a force on the floor. The direction of the reaction force by the floor on her foot is in A) +x direction B) -x direction C) +y direction (vertically up) D) -y direction (vertically down) E) depends how fast she is walking
Two springs with different spring constants, k
, are connected as shown in the figure below.
A force F is applied to one end. The force exerted by the wall on the spring is (take + to the right) A) 0 B) -k
D) F E) -F
A horse exerts a force F on a cart, causing the cart to move with increasing speed. What force does the cart exert on the horse? A) zero B) F C) greater than F D) less than F E) The force cannot be determined unless the acceleration is given.
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