Honors Physics unit 4

If the action force is a hammer hitting a nail the reaction force is…

nail hitting the hammer

Net force is defined as

the sum of all forces

You slide forward is a bus. What force causes you to slide forward

There is not a force causing me to slide

Which hammer is the most useful?

The steel hammer

mass is defined as

the amount of inertia

Compared to the force the car put on the bug, the force the bug put on the car is

equal

How much force is needed to keep the ball moving after you release it?

zero, no force is needed to keep it moving

If a non-zero net force is acting on an object, then the object is definitly…

being accelerated

In a collision between a huge SUV and a small hybrid car, the SUV exerts a larger force on the hybride than the hybrid exerts on the SUV

false

a non-zero net force is needed to cause which of the following

ALL: the speeding up of an object, the slowing down of an object, and the changing of an objects direction

What is true about the mass and weight of an astronaut on the moon’s surface, compared to the Earth?

Mass is the same, weight is less

If you push against the wall, the wall will push back on you with______ force

equal

If you pound a feather with a hammer, which one feels a greater force?

The size of the force is always exactly the same on both of them

weight is defined as

the amount of gravitational force

an object is moving with constant non-zero velocity. What is true statement about this

the net force on the object is zero

The word inertia in general means

resistance to change

an object of weight W is in free fall close to the surface of the Earth. The magnitude of the force that the object exerts on Earth is

equal to W

a 20-ton truck collides with a 1200 lb car. What is true?

During the collision, the force on the truck is equal to the force on the car

the acceleration of an object is _____ related to the net force on the object

directly

the acceleration of an object is _____ related to the mass of an object

inversely

Newtons first law

An object at rest remains at rest. An object in motion remains in motion at a constant velocity. Unless acted on by a non-zero net external force

Newtons second law

The acceleration of an object is directly proportional to the net force put on it and inversely proportional to mass of the object

Newtons third law

The force applied by one object is equal in magnitude and opposite in direction to the force applied by the second object.