Show:
Force/Momentum
Gravity 1
Velocity/
Acceleration
Newton
Gravity 2
100
Which describes a force..weight or momentum? Why?
Weight, because it decribes the pull of gravity on an object, while momentum is the relationship of force to motion.
100
What is the gravitational force exerted on an object called?
weight
100
Why do projectiles move in a curved path?
They have horizontal velocity and vertical acceleration
100
Which law explains the relationship between mass, force and acceleration?
Newton's Second Law of Motion
100
If gravity did not affect the path of a horizontally thrown ball, what path would the ball take?
Horizontal, of course
200
What happens to the weight of an object as it gets further from earth?
there is a decrease in weight
200
Why do astronauts seem weightless in orbit?
The space shuttle is in free fall
200
The acceleration of an objct is in the same direction as what?
net force
200
Which law refers to this formula - F = m times a
Newtons second law
200
Which law states " to every action there is an equal and opposite reaction"?
Newton's Third Law
300
What is the relationship of mass to distance when considering the force of gravity?
the size of the gravitational force between 2 objects depends on mass and distance. Objects closer together have a greater gravitational force than objects further apart. Increase the mass of one or both, the force of gravity also increases.
300
Which exerts the strongest gravitational force on you, Earth or the Moon?
Earth
300
In the absence of air, a penny and a feather will fall at the same rate. Why
Force of gravity on all objects is 9.8m/s squared
300
When an object moves in a circular path, it accelerates toward the center of the circle. Why?
Because of centripedal force
300
Why is it necessary for an object to accelerate?
an unbalanced force is acting on it.
400
Consider a real car and a toy car. Both are traveling at 10k/hr. Why would the real car have more momentum?
more mass
400
True or False. An object is in free fall when it pulls on the Earth and the Earth pulls on the object
True
400
What happens to weight as distance from the Earth is increased?
weight decreases
400
For any object, the greater the force that's applied to it, the greater the ______________ will be.
acceleration
400
What is the law of inertia?
Objects at rest stay at rest; objects in motion stay in motion...until unbalanced forces act.
500
When 2 balls collide, what explains the momentum of the balls after the collision?
The Law of Conservation of Momentum
500
Why does a feather fall more slowly than a brick?
air resistance
500
An object in free fall appears _________________?
weightless..explain why
500
When a force is exerted on a box, an equal and opposite force is exerted by the box. What are these forces called?
action-reaction
500
Why is it necessary to wear a seat belt?
Minimize injury from inertia that keeps your body moving. It is the unbalanced force that protects!