Unit 3 Concepts Quiz
Take the quiz till you get 100% correct, and keep studying for the Unit 3 test! Good luck.
- 1.A book is lying at rest on a table. The book will remain there at rest because:
- A.
There is a net force but the book has too much inertia
- B.
There are no forces acting on it at all
- C.
The net force on the book is zero
- D.
There is a net force, but the book is too heavy to move
- 2.A hockey puck slides on ice at constant velocity. What is the net force acting on the puck?
- A.
More than its weight
- B.
Equal to its weight
- C.
Less than its weight but more than zero
- D.
Depends on the speed of the puck
- E.
Zero
- 3.Consider a cart on a horizontal frictionless table. Once the cart has been given a push and released, what will happen to the cart?
- A.
Slowly come to a stop
- B.
Continue with constant acceleration
- C.
Continue with constant velocity
- D.
Continue with decreasing acceleration
- E.
Immediately come to a stop
- 4.A force F acts on mass M for a time interval T, giving it a final speed v. If the same force acts for the same time on a different mass 2M, what would be the final speed of the bigger mass?
- A.
4 v
- B.
2 v
- C.
V
- D.
1/2 v
- E.
1/4 v
- 5.
A feather and a stone fall together in a vacuum tube with no air resistance. What can you say about the force of gravity Fg acting on the stone and the feather?- A.
Fg is greater on the feather
- B.
Fg is greater on the stone
- C.
Fg is zero on both due to vacuum
- D.
Fg is equal on both always
- E.
Fg is zero on both always
- 6.A feather and a stone fall together in a vacuum tube with no air resistance. What can you say about the acceleration of gravity "g" acting on the stone and the feather?
- A.
G is greater on the feather
- B.
G is greater on the stone
- C.
G is zero on both due to vacuum
- D.
G is equal on both always
- 7.A block of mass m rests on the floor of an elevator that is moving upward at constant speed. What is the relationship between the force due to gravity and the normal force on the block?
- A.
N > mg
- B.
N = mg
- C.
N < mg (but not zero)
- D.
N = 0
- E.
Depends on the size of the elevator
- 8.A block of mass m rests on the floor of an elevator that is accelerating upward. What is the relationship between the force due to gravity and the normal force on the block?
- A.
N > mg
- B.
N = mg
- C.
N < mg (but not zero)
- D.
N = 0
- E.
Depends on the size of the elevator
- 9.Consider two identical blocks, one resting on a flat surface, and the other resting on an incline. For which case is the normal force greater?
- A.
Block on flat surface
- B.
Block on incline
- C.
Both the same (N = mg)
- D.
Both the same (N < mg)
- E.
Both the same (N = 0)
- 10.When you climb up a rope, the first thing you do is pull down on the rope. How do you manage to go up the rope by doing that??
- A.
This slows your initial velocity which is already upward
- B.
You don’t go up, you’re too heavy
- C.
You’re not really pulling down – it just seems that way
- D.
The rope actually pulls you up
- E.
You are pulling the ceiling down
- 11.In outer space, a bowling ball and a ping-pong ball attract each other due to gravitational forces. How do the magnitudes of these attractive forces compare?
- A.
The bowling ball exerts a greater force on the ping-pong ball
- B.
The ping-pong ball exerts a greater force on the bowling ball
- C.
The forces are equal
- D.
The forces are zero because they cancel out
- E.
There are actually no forces at all
- 12.In outer space, gravitational forces exerted by a bowling ball and a ping-pong ball on each other are equal and opposite. How do their accelerations compare?
- A.
They do not accelerate because they are weightless
- B.
Accelerations are equal, but not opposite
- C.
Accelerations are opposite, but bigger for the bowling ball
- D.
Accelerations are opposite, but bigger for the ping-pong ball
- E.
Accelerations are equal and opposite
- 13.A box of weight 100 N is at rest on a floor where μs = 0.4. A rope is attached to the box and pulled horizontally with tension T = 30 N. Which way does the box move?
- A.
Moves to the left
- B.
Moves to the right
- C.
Moves up
- D.
Moves down
- E.
The box does not move
- 14.When a person stands on a rotating merry-go-round, the frictional force exerted on the person by the merry-go-round is:
- A.
Greater in magnitude than the frictional force exerted on the person by the merry-go-round
- B.
Opposite in direction to the frictional force exerted on the merry-go-round by the person
- C.
Directed away from the center of the merry-go-round
- D.
Zero if the rate of rotation is constant
- E.
Independent of the person's mass
- 15.A rocket with a mass of 1000 kg is accelerating upward. The acceleration is 4 m/s2 upward. What is the magnitude of the thrust (lifting force) of the rocket's engines? (use g = 10 m/s2).
- A.
4000 N
- B.
14000 N
- C.
6000 N
- D.
10000 N
- 16.A 5-kg block is being pushed by a 20-N horizontal force so that the block is moving at a constant velocity of 0.8 m/s along a level floor. The frictional force acting on the block by the floor is:
- A.
4 N
- B.
100 N
- C.
20 N
- D.
16 N
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