Show:
Famous Physicists
Review
Now you're forcing me to do this!
This makes me tense
Weighty Topics
100
Aristotle and his followers for many centuries thought Earth was at rest at the center of the universe because... a. humans experience no sensation of a moving Earth. b. Earth rotates about its axis. c. Earth moves in a perfect circle. d. Earth moves in an elliptical path about the Sun.
What is humans experience no sensation of a moving Earth?
100
Which of these is not a vector quantity? a. Speed b. Velocity c. Force d. All are vector quantities.
What is Speed!!
100
When dishes remain on a table when you yank away a tablecloth, you’re illustrating a. friction. b. inertia. c. constant motion. d. ΣF = 0.
What is inertia?
100
If Burl carried Paul piggy-back while standing in the middle of a scaffold, the tensions in the two supporting ropes would a. cancel to zero. b. be equal. c. be unequal. d. more easily support Burl and Paul.
What is b. be equal?
100
Place a book that weighs 10 N on a table and the support force on the book is. a. slightly less than 10 N. b. 10 N. c. slightly greater than 10 N. d. dependent on whether the book is flat or stands upright.
What is b. 10 N.
200
Science greatly advanced when Galileo favored... a. philosophical discussions over experiment. b. experiment over philosophical discussions. c. nonmathematical thinking. d. None of these.
What is experimentation over philosophical discussion?
200
Newton was a huge hockey fan and amateur player. He known for the quote, "you miss 100% of the shots you don't take."
What is False?
200
A girl pushes a cart to the left with a 100-N force. A boy pushes it to the right with a 50-N force. The net force exerted by the girl and the boy is... a. 100 N to the left. b. 100 N to the right. c. 50 N to the left. d. 50 N to the right.
What is c. 50 N to the left?
200
Burl and Paul have a total weight of 1300 N. The tensions in the ropes that support the scaffold they stand on add to 1700 N. The weight of the scaffold itself must be a. 400 N. b. 500 N. c. 600 N. d. 800 N.
What is a. 400 N?
200
The equilibrium rule, ΣF = 0, applies to a. objects or systems at rest. b. objects or systems in uniform motion in a straight line. c. Both of these. d. Neither of these.
What is c. Both of these.
300
Galileo said that if you rolled a ball along a level surface it a. soon slow down due to its natural tendency to come to rest. b. keep rolling without slowing if no friction acted upon it. c. roll as long as its inertia nudged it along. d. soon roll in the opposite direction.
What is keep rolling without slowing if no friction acted upon it?
300
If gravity between the Sun and Earth suddenly vanished, Earth would continue moving in a. a curved path. b. an outward spiral path. c. an inward spiral path. d. a straight-line path.
What is a straight line?
300
When a 10-kg block is simultaneously pushed eastward with a force of 20 N and westward with 15 N, the combination of these forces on the block is a. 35 N west. b. 35 N east. c. 5 N east. d. 5 N west.
What is c. 5 N east?
300
If the mass of an object is halved, the weight of the object is A. halved. twice. depends on location. None of the above.
What is a. halved?
300
Earth moves about 30 km/s relative to the Sun. When you jump upward in front of a wall, the wall doesn’t slam into you at 30 km/s. This is because the wall a. has too little gravity to influence you. b. moves in an opposite direction to you. c. and you are moving at the same horizontal speed before, during, and after your jump. d. has negligible inertia compared with the Sun.
What is c. and you are moving at the same horizontal speed before, during, and after your jump?
400
When Galileo rolled a ball down one incline so that at the bottom it rolled up another, he found that the ball rolleda. almost to its initial height. b. halfway to its original height. c. to its original height. d. higher than its original height.
What is almost to its initial height?
400
A space probe in remote outer space continues moving a. because some kind of force acts on it. b. in a curved path. c. even though no force acts on it. d. due to gravity.
What is c. even though no force acts on it?
400
When a 10-N object is suspended at rest by two vertical strands of rope, the tension in each rope is a. slightly less than 5 N. b. 5 N. c. slightly more than 5 N. d. 10 N.
What is b. 5 N?
400
When sign painters Burl and Paul stand on opposite ends of a scaffold, the tensions in the two supporting ropes a. are equal. b. depend on the relative weights of Burl and Paul. c. combine to equal zero. d. are in equilibrium.
What is b. depend on the relative weights of Burl and Paul? Explanation: If they have equal weights, then tensions in both ropes would be the same. If Burl is heavier than Paul, then more weight is supported by Burl’s rope and tension in it is greater.
400
The force of friction can occur A. with sliding objects. B. in water. C. in air. D. All of the above.
What is d all of the above?
500
According to Galileo, inertia is a a. force like any other force. b. special kind of force. c. property of all matter. d. concept opposite to force.
What is property of all matter?
500
Consider a ball resting in the middle of a cart. When you quickly jerk the cart forward, the a. hits the front of the cart. b. hits the back of the cart. c. remains in the middle of the cart. d. All of these are possible, depending on how quickly the cart is pulled.
What is b. hits the back of the cart. The ball tends to remain at rest, and the back of the cart intercepts it, so the back of the cart and the ball hit each other.
500
The net force on any object in equilibrium is a. zero. b. 10 meters per second squared. c. equal to its weight. d. somewhat less than its weight.
What is a. Zero?
500
The Lead singer of a local band decided he would crowd surf and dove off the stage toward the waiting crowd. As he flew forward he began to settle onto outstretched arms and hands. But did not achieve static equilibrium. Did he a. Float above the crowd, b. Get handed across the crowd out and back to the stage. c. Land spectacularly face first on the floor. d. none of the above.
What is c. Land spectacularly face first on the floor.
500
Sanjay pushes a refrigerator across a kitchen floor at a constant speed, the force of friction between the refrigerator and the floor is A. less than Sanjay’s push. B. equal to Sanjay’s push. C. equal and opposite to Sanjay’s push. D. more than Sanjay’s push.
What is c. equal and opposite to Sanjay's push?