A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is

When no forces act on moving objects their paths are normally 

If gravity between the Sun and Earth suddenly vanished, Earth would continue moving in

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to

Which concept is being illustrated when a tablecloth is quickly yanked beneath dishes resting on a table?

When you flick a card from beneath a coin that hardly moves, you're illustrating

A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is

If your automobile runs out of fuel while driving, the engine stops. You don't come to an abrupt stop due to

When a rocket ship gaining speed in outer space runs out of fuel, it

A moving van with a stone lightly glued to the midpoint of its ceiling smoothly moves at constant velocity. When the glue gives way, the stone falls and hits the floor

While you are standing in the aisle of a bus, the driver suddenly makes a left turn. You lurch to the right due to

Nellie pulls with a force of 50 N on a horizontal rope tied to a tree at rest. The net force on the rope is

Two students engaged in a tug-of-war each pull a rope in opposite directions with a force of 400 N. The net force on the rope is

A force is a vector quantity because it has both

A block pulled to the left with 15 N and to the right with 5 N at the same time experiences a net force of 

A tree stump is pulled northward by a 10-N force at the same time a 25-N force pulls it southward. The resultant force has a magnitude of

A pair of 10-N vectors at right angles to each other has a resultant of about

A mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the same direction has a speed of

A mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the opposite direction has a speed of

Katelyn runs along the aisle of a train that moves at 8 m/s. Her speed relative to the floor is 3 m/s. Her speed relative to an observer at rest on the ground is

The speedometer of an automobile reads

The two measurements necessary for calculating average speed are

When you walk at an average speed of 4 m/s, in 5 s you'll cover a distance of

A vehicle undergoes acceleration when it

The average speed of a horse that gallops 10 kilometers in 30 minutes is

While a car travels around a circular track at a constant speed, its

If a car increases its velocity from zero to 60 m/s in 10 seconds, its acceleration is

If an object moves with constant acceleration, its velocity must

A rock dropped from a 5-m height accelerates at 10 m/s2 and strikes the ground 1 s later. If the rock is dropped from a height of 2.5 m, its acceleration of fall is 

A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always

A car's speed 3 seconds after accelerating from rest at 2 m/s2 is

A ball starting from rest at the top of an inclined plane gains a speed of 2 m/s for each second it rolls. What is its acceleration down the incline?

A ball starting from rest at the top of an inclined plane accelerates at 2 m/s2 and reaches the bottom of the plane in 3 seconds. What is the length of the plane? 

The time it takes a car to attain a speed of 30 m/s when accelerating from rest at 2 m/s2 is

What is the acceleration of a car that starts from rest and 5 seconds later reaches a speed of 20 m/s?

The distance a freely falling bowling ball falls each second 

Twelve seconds after starting from rest, a freely-falling cantelope has a speed of

An apple falls from a tree and hits the ground 5 meters below with a speed of about

If a stone falls to the bottom of a mineshaft in 6 seconds, then the depth of the shaft is about

If a freely falling object were equipped with a speedometer, its speed reading would increase each second by about

If a freely falling object were equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s2, then its speed reading would increase each second by

If an object falling freely were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be

An object at rest near the surface of a distant planet starts to fall freely. If the acceleration there is twice that of the Earth, its speed one second later would be

Whenever the net force on an object is zero, its acceleration

If an apple experiences a constant net force, it will have a constant

If you double the net force on an object, you'll double its

If the net force on a cart is tripled, the cart's acceleration 

The mass of a pet turtle that weighs 10 N is about

A bag of groceries that has a mass of 10 kilograms weighs about

Compared to the mass of an apple on Earth, the mass of the apple on the Moon is

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has the same

A constant net force on a rail-road car produces constant

If an object's mass is decreasing while a constant force is applied to the object, the acceleration

If the mass of a cart is quickly loaded to have twice the mass while a propelling force remains constant, the cart's acceleration

An apple weighs 1 N. When the apple is held at rest above your head, the net force on the apple is

An apple at rest weighs 1 N. The net force on the apple when it is in free fall is

Which has zero acceleration? An object

A car by itself is capable of a certain maximum acceleration. When it tows a car of the same mass, its maximum acceleration is

A car by itself is capable of a certain maximum acceleration. When it tows a twice-as-massive car, its maximum acceleration is

You drive your car at a constant 60 km/h along the highway. You apply the brakes until the car slows to 40 km/h. If at that moment you suddenly release the brakes, the car tends to

A heavy block at rest is suspended by a vertical rope. When the block accelerates upward by the rope, the rope tension

A mobile phone is pulled northward by a force of 10 N and at the same time pulled southward by another force of 15 N. The resultant force on the phone is

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is

A 10-N falling object encounters 4 N of air resistance. The net force on the object is

A 10-N falling object encounters 10 N of air resistance. The net force on the object is

A block is dragged without acceleration in a straight-line path across a level surface by a force of 6 N. What is the force of friction between the block and the surface?

A car traveling at 22 m/s comes to an abrupt halt in 0.1 second when it hits a tree. What is the deceleration of the car?

A 10-kilogram block with an initial velocity of 10 m/s slides 10 meters across a horizontal surface and comes to rest. It takes the block 2 seconds to stop. The stopping force acting on the block is about

You cannot exert a force on a wall 

When you rub your hands together, you

When you drop a rubber ball on the floor it bounces back. The force exerted on the ball to produce bouncing is by the

As a ball bounces from a floor, its acceleration off the floor between bounces is

When a boxer hits a punching bag, the strength of his punch depends on how much force the bag can

Your friend says that the heavyweight champion of the world cannot exert a force of 50 N on an isolated piece of tissue paper with his best punch. You

One end of a rope is pulled with 100 N, while the opposite end also is pulled with 100 N. The tension in the rope is

A piece of rope is pulled by two people in a tug-of-war. Each exerts a 400-N force. What is the tension in the rope?

The winner in a tug-of-war exerts the greatest force on

Arnold Strongman and Suzie Small each pull very hard on opposite ends of a rope in a tug-of-war. The greater force on the rope is exerted by

When a skateboarder pushes on a wall,

A pair of action-reaction forces always

A fast-moving missile soaring overhead possesses

When you walk, you push on the floor to the left and the floor

Harry pulls on the end of a spring attached to a wall. The reaction to Harry's pull on the spring is

Action and reaction pairs of forces

For every action force, there must be a reaction force that

An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the

When a karate chop breaks a board with a 3000-N blow, the amount of force that acts on the hand is

The emphasis of the orange-and-apple sequence in your textbook is

The force that accelerates the orange and apple system featured in your textbook is actually supplied by the

To produce an acceleration to a system there

A player catches a ball. If action is the force of the ball against the player's glove, reaction is the

A player hits a ball with a bat. If action is the force of the bat against the ball, reaction is the

When a baseball player bats a ball with a force of 1000 N, the reaction force that the ball exerts against the bat is

While you stand on the floor you are pulled downward by gravity, and supported upward by the floor. Gravity pulling down and the support force pushing up

The force exerted on the tires of a car that directly accelerate it along a road is exerted by the

A car traveling at 100 km/h strikes an unfortunate bug and splatters it. The force of impact is

When a tennis racquet hits a ball,

As a ball falls, the action force is the Earth's pull on the ball.   The reaction force is the

The earliest and most influential Greek Philosopher was Aristotle, who among many contributions taught that

Inertia is defined as a

If no external forces act on a moving object, it will

The amount of force needed to sustain motion of a rock in outer space is 

Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the same direction. Jake’s speed relative to the ground is 

A 300 kg bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is 

Your weight as measure in your bathroom scale is

A heavy ball hangs by a string, with a second string attached to its bottom. A slow pull on the bottom string breaks the 

A tow truck exerts a force of 3000 N on a car, which then accelerates at 2 m/s2. What is the mass of the car?

The lift experienced by a helicopter involves an action-reaction pair of forces between the