Acceleration
Fluids
Newton's Laws
Falling Objects
Grab Bag
100

What is instantaneous acceleration?

how fast a velocity is changing at a specific instant

100

The upward force acting on the wing of an airplane in flight

Lift

100

If a golfball and a basketball have a head-on collision, upon which object is the impact force greater?

the same for both (Newton's 3rd law)

100

The forces acting on a falling feather are

gravity and air resistance

100

The relationship between buoyant force and weight of a displaced fluid was first stated by

Archimedes

200

Suppose a cart is being moved by a certain net force. If a box is dumped into the cart, so its mass is doubled, by how much does the acceleration change?

It will be halved

200

Why does a hot air balloon float?

The weight of the balloon is less than the weight of the air displaced by the balloon.

200

Suppose a cart is being moved by a certain net force. If a box is dumped into the cart, so its mass is doubled, by how much does the acceleration change?

It will be halved 

200

Projectile motion is caused by

the downward force of gravity and an initial forward velocity.

200

The SI unit of force is the

Newton

300

Give three ways that an object can accelerate

speed up, slow down, turn

300

What type of friction occurs when a fishing lure is pulled through water?

fluid friction
300

When a pair of balanced forces acts on an object, the net force that results is

equal to zero

300

As an astronaut travels far away from Earth, her weight

decreases because gravity decreases.

300

Speed is the ratio of the distance an object moves to

the amount of time needed to travel the distance.

400

What happens when an unbalanced force acts on an object?

It accelerates
400

Which of the following is not a fluid?

a. cork

b. air

c. oil

d. water

A. cork

400

The property of matter that resists changes in motion is called

Inertia

400

An open parachute increases air resistance of a falling sky diver by

increasing surface area

400

The upward force acting on an object submerged in a fluid is called

buoyant force

500

Acceleration is the rate at which _______ changes.

Velocity

500

The strength of the buoyant force acting on an object in a fluid depends on the object’s

volume

500

When an unbalanced force acts on an object...

the object accelerates

500

Objects in free fall near the surface of the Earth experience:

a. constant speed.    c.    constant acceleration.    

b.    constant velocity.    d.    constant distance.

c.    constant acceleration.    

500

Your weight equals your

mass times the acceleration due to gravity.

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