Acceleration
What is instantaneous acceleration?
how fast a velocity is changing at a specific instant
The upward force acting on the wing of an airplane in flight
Lift
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)
The forces acting on a falling feather are
gravity and air resistance
The relationship between buoyant force and weight of a displaced fluid was first stated by
Archimedes
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
Why does a hot air balloon float?
The weight of the balloon is less than the weight of the air displaced by the balloon.
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
Projectile motion is caused by
the downward force of gravity and an initial forward velocity.
The SI unit of force is the
Newton
Give three ways that an object can accelerate
speed up, slow down, turn
What type of friction occurs when a fishing lure is pulled through water?
When a pair of balanced forces acts on an object, the net force that results is
equal to zero
As an astronaut travels far away from Earth, her weight
decreases because gravity decreases.
Speed is the ratio of the distance an object moves to
the amount of time needed to travel the distance.
What happens when an unbalanced force acts on an object?
Which of the following is not a fluid?
a. cork
b. air
c. oil
d. water
A. cork
The property of matter that resists changes in motion is called
Inertia
An open parachute increases air resistance of a falling sky diver by
increasing surface area
The upward force acting on an object submerged in a fluid is called
buoyant force
Acceleration is the rate at which _______ changes.
Velocity
The strength of the buoyant force acting on an object in a fluid depends on the object’s
volume
When an unbalanced force acts on an object...
the object accelerates
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.
Your weight equals your
mass times the acceleration due to gravity.