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WorksheetsUnit 4 Review
Total questions: 20
Worksheet time: 10mins
A book is lying at rest on a table. The book will remain there at rest because:
there is a net force but the book has too much inertia
there are no forces acting on it at all
it does move, but too slowly to be seen
there is no net force on the book
there is a net force, but the book is too heavy to move
A hockey puck slides on ice at constant velocity. What is the net force acting on the puck?
more than its weight
equal to its weight
less than its weight but more than zero
depends on the speed of the puck
zero
You put your book on the bus seat next to you. When the bus stops suddenly, the book slides forward off the seat. Why?
a net force acted on it
no net force acted on it
it remained at rest
it did not move, but only seemed to
gravity briefly stopped acting on it
You kick a smooth flat stone out on a frozen pond. The stone slides, slows down and eventually stops. You conclude that:
the force pushing the stone forward finally stopped pushing on it
no net force acted on the stone
a net force acted on it all along
the stone simply “ran out of steam”
the stone has a natural tendency to be at rest
Consider a cart on a horizontal frictionless table. Once the cart has been given a push and released, what will happen to the cart?
slowly come to a stop
continue with constant acceleration
continue with decreasing acceleration
continue with constant velocity
immediately come to a stop
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?
push the cart harder before release
push the cart longer before release
push the cart continuously
change the mass of the cart
it is impossible to do that
A very large truck sits on a frozen lake. Assume there is no friction between the tires and the ice. A fly suddenly smashes against the front window. What will happen to the truck DURING the short time of impact?
it is too heavy, so it just sits there
it moves backward at const. speed
it accelerates backward
it moves forward at const. speed
it accelerates forward
A very large truck sits on a frozen lake. Assume there is no friction between the tires and the ice. A fly suddenly smashes against the front window. What will happen to the truck AFTER the impact?
it is too heavy, so it just sits there
it moves backward at const. speed
it accelerates backward
it moves forward at const. speed
it accelerates forward
What can you say about the force of gravity Fg acting on a stone and a feather?
Fg is greater on the feather
Fg is greater on the stone
Fg is zero on both due to vacuum
Fg is equal on both always
Fg is zero on both always
Assuming no air resistance, what can you say about the acceleration of gravity acting on the stone and the feather?
it is greater on the feather
it is greater on the stone
it is zero on both due to vacuum
it is equal on both always
it is zero on both always
An astronaut on Earth kicks a bowling ball and hurts his foot. A year later, the same astronaut kicks a bowling ball on the Moon with the same force. His foot hurts...
more
less
the same
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?
FN > Fg
FN = Fg
FN < Fg (but not zero)
FN = 0
depends on the size of the elevator
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?
FN > Fg
FN = Fg
FN < Fg (but not zero)
FN = 0
depends on the size of the elevator
In the image, you see two cases: a physics student pulling or pushing a sled with a force F which is applied at an angle theta. In which case is the normal force greater?
case 1
case 2
it is the same for both
depends on the magnitude of the force F
depends on the ice surface
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?
case A
case B
both the same (FN = Fg)
both the same (0 < FN < Fg)
both the same (FN = 0)
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??
this slows your initial velocity, which is already upward
you don’t go up, you’re too heavy
you’re not really pulling down – it just seems that way
the rope actually pulls you up
you are pulling the ceiling down
In outer space, a bowling ball (object 1) and a ping-pong ball (object 2) attract each other due to gravitational forces. How do the magnitudes of these attractive forces compare?
the bowling ball exerts a greater force on the ping-pong ball
the ping-pong ball exerts a greater force on the bowling ball
the forces are equal
the forces are zero because they cancel out
there are actually no forces at all
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?
they do not accelerate because they are weightless
accels. are equal, but not opposite
accelerations are opposite, but bigger for the bowling ball
accelerations are opposite, but bigger for the ping-pong ball
accelerations are equal and opposite
A small car collides with a large truck. Which experiences the greater impact force?
the car
the truck
both the same
it depends on the velocity of each
it depends on the mass of each
During the collision between the car and the truck, which has the greater acceleration?
the car
the truck
both the same
it depends on the velocity of each
