Quiz review
A 10-N falling object encounters 4 N of air resistance the magnitude of the net force on the object is
A. 0 N B. 0.1 N C. 1 N D. 10 N E. none of the above
An apple weighs 1 N. The magnitude of net force on the apple when it is in free-fall is
A. 0 N B. 0.1 N C. 1 N D. 10 N E. none of the above
An apple weighs 1 N. When held at rest above your head, the net force on the apple is
A. 0 N B. 0.1 N C.1 N D. 10 N E. none of the above
An object is pulled northward with a force of 10 N and southward with a force of 15 N. The magnitude of the net force of the object is
A. 0 N B. 5 N C. 10 N D. 15 N E. none of the above
A girl pulls on a on a 10-kg wagon with a constant force of 30 N. What is the wagon's acceleration in meters per second squared?
A. 0.3 B. 3.0 C. 10 D. 30 E. 300
on the surface of Jupiter, where the acceleration due to gravity is about three times that of Earth, a 100-kg rock would have mass of about
A. 100 kg B. 300 kg C. 600 kg D. 900 kg
A tow truck exerts a force of 3000 N on a car, accelerating it at 2 m/s^2. What is the mass of the car?
A. 500 Kg B. 1000 Kg C. 1500 Kg D. 3000 Kg E. None of the above
A car has a mass of 1000 kg and accelerates at 2 meters per second per second. What is the magnitude of the net force exerted on the car?
A. 500 N B. 1000 N C. 1500 N D. 2000 N E. none of the above
what can you say about the force of gravity Fg acting on a stone and a 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
An object in mechanical equilibrium is an object
A. at rest B. moving with constant velocity C. having no acceleration D. all of the above
Neglecting friction, a large block of ice and a small block of ice start sliding down an incline together. The heavier block will get to the bottom
A. before the light block B. after the light block C. at the same time as the light block
If an object's mass is decreasing while a constant force is applied to the object, the acceleration
A. decreases B. increases C. remains the same
A 10-N block and a 1-N block lie on a horizontal friction less table. to push the with equal acceleration, we would have to push with
A. equal forces on each block B. 10 times as much force on the heavier block C. 10 squared or 100 times as much force on the heavier block D. one-tenth as much force on the heavier block E. none of the above
A rocket becomes progressively easier to accelerate as it travels upward from the ground mainly because
A. gravity becomes weaker with increased distance B. the applied force on the rocket increases as burning of fuel progresses C. the mass of the rocket decreases as fuel is burned D. E.
A force of 1 N accelerates a mass of 1 Kg at the rate of 1 m/s^2. The acceleration of a mass of 2 kg acted upon by a force of 2 N is
A. half as much B. twice as much C. the same D. none of the above
An object following a straight-line path at a constant speed
A. has a net force acting upon it in the direction of motion B. has zero acceleration C. must be moving in a vacuum or in the absence of air drag D. has no forces acting on it E. none of the above
what can you say about the acceleration of gravity Fg acting on the stone and a feather?
A. it is greater on the feather B. it is greater on the stone C. it is zero on both due to vacuum D. it is equal on both always E. it is zero on both always
A force is a vector quantity because it has both
A. magnitude and direction B. mass and acceleration C. action and reaction couterparts
Strange as it may seem, it is just as hard to accelerate a car on a level surface on the moon as it is here on the Earth. This is because the
A. mass of the car is independent of gravity B. weight of the car is independent of gravity C. nonsense! a car is much more easily accelerated on the moon than on earth
Whenever the net force on an object is zero, its acceleration
A. may be zero B. is zero
We just decided that the cart continues with constant velocity. What would have to be done in order to have the cart continue with constant acceleration?
A. push the cart harder before release B. push the cart longer before release C. push the cart continuously D. change the mass of the cart E. it is impossible to do that
An object is propelled along a straight-line path by a force. If the net force were doubled, the object's acceleration would be
A. quadruple B. double C. stay the same D. halve E. none of the above
You kick a smooth flat stone out on a frozen pond. The stone slides, slows down and eventually stops. You conclude that:
A. the force pushing the stone forward finally stopped pushing on it B. no net force acted on the stone C. a net force acted on it all along D. the stone simply "ran out of steam" E. the stone has a natural tendency to be at rest
A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. this best demonstrates that
A. the milk carton has acceleration B. there is an action-reaction pair of forces C. gravity tends to hold the milk carton secure D. the milk carton has inertia E. none of the above
A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is
A. the same as the force on the 1-kg book B. ten times as much as the force on the 1-kg book C. zero
if the mass of an object does not change, a constant net force on the object produces constant
A. velocity B. acceleration C. both A and B D. none of the above