Forces and Motion practice

Study for test!!!

24 cards·by rockandrollgirl

http://www.physicscl

what is Newton's first law?

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by a

what is Newton's second law?

the acceleration of an object equals the net force acting on the object divided by the object’s mass. (F=mxa)

What is Newton's third law?

For every action there is an equal and opposite reaction

Hitting a baseball on Mercury will go much faster than hitting a baseball on Earth

A person’s body is thrown outward as a car rounds a curve on a highway.

Rockets are launched into space using jet propulsion where exhaust accelerates out from therocket and the rocket accelerates in an opposite

Pushing a child on a swing is easier than pushing an adult on the same swing, because the adult has more inertia.

A soccer player kicks a ball with their foot and their toes are left stinging.

Inertia is a force.

false

The tendency of an object to resist change in its motion (not wanting to change its motion) is known as

inertia

A net force (an unbalanced force that changes motion) causes an object to

accelerate (speed up) or decelerate (slow down).

Forces that are equal in size and opposite in direction are known as

balanced forces

You are riding fast on a skateboard when your wheel suddenly gets stuck in a crack on the sidewalk. Why does your body go flying forward?

there is a net force pushing you off your skateboard

You just collected a huge bag of leaves in your yard, and you need to move it out to the curb. How could you get the bag to move faster?

both of the above would work (both pushing harder and making it lighter)

The force that pulls falling objects toward Earth is called

gravity

In science, a push or a pull is called a(n)

force

Fast-moving objects have more inertia than slow-moving objects.

false

A more massive object has more inertia than a less massive object.

true

The standard metric unit of mass is the kilogram.

true

If all other variables are equal, then it would require less exerted force to stop a less massive object than to stop a more massive object

true

The weight of an object is dependent upon the value of the acceleration of gravity.

true

The weight of an object can be measured in kilograms.

false

If an object is accelerating at a constant rate of acceleration, then the forces acting uponthe object are balanced.

false

It would take an unbalanced force to keep an object in motion.

false