Ch 2 Laws of Motion

The resistance of objects to any change is motion is called (gravity, inertia, terminal speed, acceleration)

inertia

New's first law of motion states that an object at rest stays at rest unless a (balanced force, net force, weak force, strong force) acts on it

net force

As the ball falls, the action is the pull of Earth's mass on the ball, the ball reaction force is the (air resistance acting on the ball, ball's acceleration, pull of ball's mass on Earth, nonexistent, none of above)

pull of ball's mass on Earth

If the same force is applied to four different objects with masses of 8kg, 2kg, 27kg, and 30kg, which object will have the greatest acceleration?

2kg

If a 300 N action force is exerted to the right the reaction force will be (300 N to the right, 600 N to the right, 300 N to the left, 600 N to the left)

300 N to the left

A man weighting 800 N stands at rest on two scales so his weighs is even for both scales, so the reading on each scale is (200N, 400N, 800N, 1600N, none)

400 N

When a woman stands at rest with two feet on a scale, it reads 500 N, when she gently lifts one foot, the scale reads (less than 500 N, more than 500 N, 500 N)

500 N

An object is pulled north with a force of 10 N and south with a force of 15 N, so the magnitude of the net force on the object is (0N, 5N, 10N, 15N, none)

5N

According to Newton's second law of motion (F=mv, F=ma, F=pv, F=pa)

F=ma

On Earth an object weighs 30 N and another one weighs 30 N on the moon, which one has the greater mass? (Earth one, moon one, same, not enough info)

Moon

The relationship among mass, force, and acceleration is explained by (Newton's 1st law of motion, Newton's 2nd law of motion, Newton's 3rd law of motion, the conservation of momentum)

Newton's 2nd law of motion

When an object falls through the air, its velocity increases and its acceleration (increases, decreases, same)

decreases

An object is propelled along straight path by force, and if the net force was doubled the acceleration was (4x, 2x, same, half, none)

double

An elephant and a feather fall from a tree through the air to the ground below, so is the air resistance more for the (elephant, feather, same)

elephant

Without air, a penny and a feather dropped from the same weight will (fall at different times, float, fall at same times, not have momentum)

fall at same times

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

follow a straight line path

A player hits a ball, the action is the impact of the bat against the ball, the reaction is the (ball's air resistance, ball's weight, force of the ball against the bat, grip of the players hand against the ball, none)

force of the ball against the bat

A player catches a ball, the action is the impact of the ball against the player's glove, the reaction is the (players grip on the love, force the glove exerts on the ball, friction of the ground against the players shoes, muscular effort in the player's arms, none)

force the glove exerts on the ball

Every object in the universe exerts a force on every other object, this force is called (friction, mass, gravity, inertia)

gravity

Two objects of the same size but different weights are dropped and if you take air resistance into consideration, the object to hit the ground first will be the (lighter one, heavier one, both, not enough info)

heavier

Mass decreasing while a constant force is applied the acceleration (increases, decreases, same)

increases

A person in a head on collision, who is not wearing a seat belt, continues to move forward at the car's speed because of (inertia, friction, weight, gravity)

inertia

When a falling object has reached its terminal velocity, its acceleration is (constant, 0, g)

0

A hockey puck is set in motion across a frozen pond and where friction and air resistance is neglected, the force required to keep the puck sliding at a constant velocity is (0N, equal to the puck's weight, puck weight/puck mass, puck mass*10m/s^2, none)

0N

An apple weighs 1 N, and when held at rest above your head, the net force on the apple is (0N, 0.1N, 1N, 10N, none)

0N

A rock is thrown vertically into the air, At the top of its path, its acceleration is meters per second squared is about (0, 10, between 0 and 10, more than 10, none)

10

A 10 kg brick and a 1 kg book are dropped in a vacuum, the force on the 10 kg brick is (the same force on the 1 kg book, 10 times as much force on the 1 kg book, zero)

10 times as much force on the 1 kg book

Compared with a 1 kg block, a 2 kg has twice as much (inertia, mass, volume, all, none)

all (inertia, mass, volume)

The force required to maintain an object at a constant velocity in free space is equal to (0, the mass's object, the weight's object, the force required to stop it, none)

0

The force needed to accelerate an object with a mass of 4 kg by 2m/s^2 is (8kg, 6kg, 2N, 8N)

8N

Acceleration due to gravity is (98m/s^2, 9.8m/s^, 9.8m/s, .98m/s)

9.8m/s^

"to every action is an equal an opposite reaction" is known as (The law of conservation of momentum, Newton's first law of motion, Newton's second law of motion, Newton's third law of motion)

Newton's third law of motion

Weight is measured in (Newtons, pounds, seconds, kilograms)

Newtons

If the mass of an object doesn't change, a constant net force on the object produces a constant (velocity, acceleration, both, none)

acceleration

When a force is exerted on an object, an equal and opposite force is exerted by the object, these forces are (centripetal forces, friction forces, gravitational forces, action reaction forces) a

action reaction forces

A feather will fall through the air more slowly than a brick because of (gravity, air resistance, terminal velocity, momentum)

air resistance

the upward force exerted on a n object falling through air is (terminal velocity, momentum, air resistance, weightlessness)

air resistance

An object maintains its state of motion because it has (mass, weight, speed, acceleration, all)

all

An object (at rest, moving at a constant velocity, in a mechanical equilibrium, all, none)

all (at rest, constant velocity, mechanical equilibrium)

Forces that are equal and opposite in direction are (net forces, frictional forces, balanced forces, gravitational forces)

balanced forces

A car traveling at 100 km/h hits and kills a bug, the force of impact is greater on the (bug, car, both)

both

Arnold Strongman and Suzie Small each pull hard on opposite ends of rope in tug of war, the greatest force on the rope is exerted by (Arnold, Suzie, both)

both

The greatest inertia is from a (bowling ball, ping pong ball, toothpick, pencil)

bowling ball

A real car going 10 km/h has more momentum than a toy car moving at the same rate because (its mass is more, its mass is less, it move faster, friction)

its mass is more

A kilogram is a measure of an object's (weight, force, mass, gravity, center of mass)

mass

The greater an object's (mass, speed, velocity, acceleration) the stronger the gravitational forces

mass

The size of the force needed to produce an object to acceleration is determined by its (velocity, weight, mass, direction)

mass

Two facts that greatly affect air resistance on falling objects are the size and (mass, weight, or speed)

mass

A karate chop delivers a blow of 3000 N to a board that breaks, the force that acts on the hand during this is actually (less than 3000N, 3000N, more than 3000N, no way to say)

more than 3000N

The force exerted on the tires of a car to directly accelerate it along a road is exerted by the (engine, tires, air, road, none)

road

A Mack truck and a Volkswagen traveling at the same speed cold head on, the impact force is greatest on the (Volkswagen, Mack truck, same)

same

Compared with the mass of something on Earth, the mass of the same something on the moon is (less, more, same)

same

According the Newton's second law of motion, the change in momentum is determined by the (object's inertia, object's acceleration, size of the force acting on the object, velocity acting on the object)

size of the force acting on the object

The greatest speed reached by an object falling through the air is called its (average speed, acceleration, inertia, terminal speed)

terminal speed

Your weight is (actually your mass, the gravitational attraction between you and the Earth, a property of mechanical equilibrium, all, none)

the gravitational attraction between you and the Earth

It is just as hard to accelerate a car on the Moon as it is to accelerate the car on earth because (the mass of the car is independent of gravity, the weight of the car is independent to gravity, it's the same)

the mass of the car is independent of gravity

A sheet of paper can be taken from under a container of milk without toppling it if the paper is jerked quickly. This demonstrates: (the milk carton has no acceleration, there is an action reaction pair of forces, gravity tends to hold the milk carton secure, the milk carton has inertia, none)

the milk carton has inertia

The measure of the force of gravity on an object is the object's (weight, mass, inertia, friction)

weight

A feather and a coin will have equal acceleration when falling in a vacuum because (same velocities, same gravity, no gravity in a vacuum, weight mass ratio is equal, none)

weight mass ratio is equal