Physics

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Archer shoots an arrow action force is the bowstring against the arrow. The reaction force is

Arrows push against the bowstring.

A speeding truck skids to a stop if the total mass were doubled its skidding distance would

Be twice as far

When a bug hits a car window which has a greater acceleration

Bug

Rain doesn't kill you as it falls from 10,000 ft because it has a very low

Terminal velocity

The reason a tennis ball and a steel ball will accel. At same rate w/o air resistance is that

The ball with the larger force also has the larger mass

An object that is in equilibrium may be moving

True

A constant net force on an object produces constant

Velocity and acceleration

When you take a rock from earth to the moon its changes not its

Weight and mass

Accelerations are produced by

forces

Force always occurs

in pairs

How does acceleration of an object change in relation to its mass? It is

inversely proportional

If the force acting on a cart doubles what happens to the carts acceleration

it doubles

The unit of pressure is

newtons per square meter (or pascals)

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

1N

An apple weights 1 N the net force on the apple when it is in free fall is?

1N

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

6N

A mass of 40 kg accelerates at 2m/s determine the net force acting on the object

80N

How much force is needed to accelerate a 2 kg physics book to an acceleration of 4 m/s 2

8N

Which of the follow would exert the most pressure on the ground.

A woman standing in high heel shoes.

Pulling a table cloth out from under a set of dishes is example of Newtons" Law

First

Since force is equal and opposite, why does a soccer ball fly off when kicked but not force

Foot has more mass

Pressure is defined as

Force per area

Pressure is known as

Force per unit area

What is the force that causes a book pushed on a desk to come to a rest

Friction

Acceleration produced by a net force is

In the same direction as the net force, directly proportional to the net force, inversely proportional to the mass

Objects move in a straight line at a constant speed because of the law of

Inertia

The acceleration of an object the applied net force

Is directly proportional to

Imagine a cart is being moved by a force. If its mass doubles what happens to acceleration

It halves

Suppose a cart is being moved by a force. If suddenly a load is dumped into the cart so that the cart's mass triples. What happens to the carts acceleration?

It is multiplied by 1/3

If the force acting on a cart triples, what happen to the cart's acceleration?

It triples

Adrian throws a rock vertically into the air. At the very top of its flight the net force is.

It's weight.

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

Less than 6N

The resultant of all the forces acting on a body is called

Net force

Rockets are unable to accelerate in space because

Nonsense rockets do accelerate in space

Friction always acts

Opposite to the objects motion

As a package falls from a stationary helicopter, its velocity increases and its acceleration

Remains the same

A truck exerts a force of 1000N on a car, accelerating it at 5m/s2 what is the cars mass

200kg

A women stands with 2 feet on a scale, the scale reads 250N when she lifts one foot, it read?

250N

A 50N falling object encounters 20N of air resistance. The net force on the object is.

30N

A jumbo jet cruises at constant velocity when the total thrust of the engines on the jet is 40,000N what is the acceleration of the jet?

40,000 m/s 2

You pull horizontally on a 50 kg crate with a force of 450 N and the friction force on the crate is 250 N. The acceleration of the crate is

5 m/s

Pared has a mass of 58kg determine his weight g=10m/s

580N

A 20N falling object encounters 15N of air resistance. The net force on the object is

5N

When an object reaches terminal velocity its acceleration is

0 m/s^2

Jon pulls on a 150 kg wagon with a constant force of 50N what is the wagon's acceleration?

0.3 m/s

A bowling ball weights 50N when held at rest in your hands, the net force on the ball is

0N

An apple weight 1 N. When held in your hand at rest above your head the net force on the apple is

0N

A 747 jet has a mass of 40,000 kg. The thrust for each of 4 engines is 12,000N what is the jets acceleration when taking off

1.2 m/s 2

A 10 kg brick and a 1 kg book are dropped in a vacuum. The force of gravity on the brick is.

10 times as much as the force on the 1 kg book

What is the mass of an object that accelerates at 2m/s with a force of 20N

10kg

A jet cruises at a constant velocity with total thrust of 15000N how much air resistance

15000N

The force of friction on an object is 15N the force needed to maintain constant velocity is?

15N

Action reaction pairs always

Acts on different objects, are equal and opposite, are in opposite direction

The hovercraft best examples newtons. Law

All three

You are on a frozen pond, and the ice starts to crack. If you lie down on the ice and begin to crawl, this will

Decrease the pressure on the ice.

The acceleration produced by a net force on an is

Directly proportional to the magnitude of the net force, in the same direction as the net force, inversely proportional to the mass of the object.

Which of the following are not an action reaction pair

Earth pulls down on apple hand pushes up on apple

A ball rolls down a 3 m tall hill and up another hill. Without friction it will go. 3m high

Equal to

A gun uses a force of 250 N on a bullet. The bullet exerts a force 250 N on the gun

Equal to

Objects with more mass have an easier time changing direction than object with less mass

False

As a ball falls the action force is pull of Earth's mass on ball. What is the reaction force

The pull of the balls mass on Earth

A F of 20N accelerates a 20kg mass by 1 m/s 2. A F of 40N accelerates a 40 kg mass by

The same

You throw a rock down. Compared to a rock that is dropped the acceleration of the thrown rock is

The same

Tennis ball and a steel ball with same size are dropped which has the greater force on it

The steel ball

Tennis ball and a steel ball with same size are dropped which has the greater acceleration on it

They both have the same acceleration

A bug flies into a car window which has a greater force

They're the same

A push on a 2 kg brick accelerates the brick. To equally accelerate a 4 kg brick, one would push?

With two times as much force.

An object has a constant mass. A constant force on the object produces constant

acceleration


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