Newton's 1st Law
This property describes an object’s resistance to a change in its motion.
What is inertia?
This equation relates net force, mass, and acceleration.
What is F = m / a ?
A "force pair" based on Newton's 3rd Law acts on this many objects.
What are two objects?
This type of friction acts between a sled and the snow as the sled slides.
What is kinetic friction?
This is the name for the magnitude of the gravitational force on an object.
What is weight?
This diagram uses labeled arrows to show the forces acting on a single object.
What is a free-body diagram?
A 6 kg garden gnome accelerates at 2 m/s². This is the magnitude of the net force on it.
What is 12 N?
A swimmer pushes water backward. The water pushes the swimmer in this direction.
What is forward?
A box is sliding east across a stationary floor. Kinetic friction on the box points in this direction.
What is west?
A pumpkin has a mass of 5 kg. This is its weight near Earth’s surface.
What is 50 N?
Two students pull on a wagon. One pulls with 30 N to the right and the other pulls with 10 N to the left. This is the magnitude and direction of the net force on the wagon.
What is 20 N to the right?
A net force of 20 N acts on a 5 kg cart. This is the magnitude of its acceleration.
What is 4 m/s²?
Skater A pushes Skater B with 40 N to the east. This is the force Skater B exerts on Skater A.
What is 40 N to the west?
You push a crate with 15 N to the right. It stays at rest on a level floor. This is the static friction force on the crate.
What is 15 N to the left?
An astronaut’s weight decreases on the Moon. This quantity, which effects weight, stays the same.
What is mass?
A sled moves in a straight line at constant speed of 5 m/s downhill. This is the net force on the sled.
What is 0 N?
A net force of 24 N gives a cart an acceleration of 3 m/s². This is the cart’s mass.
What is 8 kg?
Earth pulls a textbook downward. This is the other force in that force pair.
What is the textbook’s upward gravitational pull on Earth?
A box of candy slides across the floor. The normal force is 100 N and the coefficient of kinetic friction is 0.20. This is the magnitude of the friction force.
What is 20 N?
A skydiver reaches terminal velocity. If the skydiver weighs 700 N, this is the magnitude and direction of the air resistance.
What is 700 N upward?
A pickup truck brakes suddenly, and an unsecured backpack slides toward the front of the truck bed. This explains why it moves forward relative to the truck.
What is the backpack’s inertia?
Two carts experience the same net force. Cart B has twice the mass of Cart A. This is how Cart B’s acceleration compares with Cart A’s.
What is half as large?
During a head-on collision between a small car and a much heavier semi-truck, the impact forces have equal magnitudes. This vehicle experiences the greater acceleration from the impact force.
What is the small car, because it has less mass?
The coefficient of static friction between a crate and a level floor is 0.50. The floor exerts a normal force of 80 N. This is the maximum static friction force.
What is 40 N?
A ball thrown straight up is momentarily at rest at the top of its path. Ignoring air resistance, this is its acceleration at that instant.
What is 10 m/s² downward?