Newtons 2nd Law
Air resistanceIn a = F/m, what does a stand for?
a = acceleration
Newton’s 3rd Law says forces come in equal and ______ pairs.
opposite
What type of force is gravity: attractive or repulsive?
Attractive
Which stays the same when you travel from Earth to the Moon: mass or weight?
Mass
What force keeps the Moon moving around Earth?
Gravity
In a = F/m, what does F stand for?
F = force
Earth pulls on the Moon. Does the Moon also pull on Earth?
Yes
Gravity is a contact or noncontact force?
Which is measured in newtons: mass or weight?
Weight
Gravitational field arrows point toward or away from the object causing the gravity?
Toward it
A 5 kg object experiences 20 N of force. What is its acceleration?
4 m/s²
If the Moon pulls on a hammer with 5 N, how much force does the hammer pull on the Moon with?
5 N
Near Earth, objects fall toward what part of Earth?
The center, the surface, the top, etc.
If two objects move farther apart, what happens to the gravitational force between them?
It gets weaker
What two things allow a satellite to stay in orbit?
Forward motion and gravity pulling inward
A 3 kg object accelerates at 6 m/s². What force acts on it?
18N
Earth and a person pull on each other with equal forces. Why does the person move more than Earth?
Earth has much more mass, so it accelerates much less
What is the gravitational acceleration near Earth’s surface?
9.8 m/s²
Which has the stronger gravitational force: two large masses close together or two small masses far apart?
Two large masses close together
In a field diagram, what does it mean when the field arrows are closer together?
The gravitational field is stronger