The Basics
What is the name, not the definition, of Newton's 1st Law?
law of inertia
A car is easier to accelerate than a bus because the car has less mass. This is an example of which number of Newton's Laws?
2nd
What is the formula for Newton's 2nd Law?
force = mass* acceleration
F=ma
What type of force is between a wheel and a surface?
rolling friction
There is zero gravity in outer space.
False
Which number of Newton's Laws is explains momentum (when object's collide, their momentum is transferred like Jesse Hearn and David)
3rd Law
A swimmer pushes her arms backwards and she is propelled forward. This is an example of which number of Newton's Laws?
3rd
Calculate the amount of force exerted when a giant Pacific Octopus with a mass of 50 kg swims at a accelerating speed of 10 m/s2.
500N
Your weight is a measure of THIS
the Force of gravity on your body
Gravity pulls a skydiver down as the air resistance pushes the skydiver up. When these forces are equal, terminal velocity is reached.
True
An object at rest stays at rest, and an object in motion stays in motion in a straight line until an outside force causes a change. Which number of Newton's Laws does this define?
1st
Air is released from a balloon-powered car. The air in the balloon is expelled backwards, and the car is pushed forward. Which number of Newton's Laws is this an example?
3rd
A llama weighing 200 kg needs to be lifted up on a stretcher. The upward acceleration on the stretcher is 0.63 m/s2. What net force is needed to accelerate the llama?
126 N
(200 kg)(0.63 m/s/s) = 126 N
According to Newton's 2nd Law:
If the force is held constant and the mass increases, the acceleration will _________.
increases, decreases, remain the same
decreases
Only solid matter has inertia since inertia is based on mass.
False
Which number of Newton's Laws?
When one object exerts a force on another object, the second object exerts a force on the first that is equal and opposite in direction.
3rd Law
A skateboarder hits a rock and is then thrown over her skateboard onto the ground. Which number of Newton's Law is this an example?
1st
What is the acceleration of a 650 kg racing camel that has a forward net force of 897N?
1.38 m/s/s
897/650
What type of friction prevents an object from sliding across a surface?
static
Newton's 3rd Law supports the reason why objects tend to move in a straight line.
False. It's Newton's 1st Law
Which number of Newton's Laws explains this:
The acceleration of an object is in the same direction as the net force on the object.
2nd
A bug hits a windshield. The force of the bug on the windshield is _____ the force of the windshield on the bug.
greater than , less than, equal to
equal to....Although the forces are equal, the bug gets squished because it has less mass.
A cheetah accelerates at 5.4 m/s/s with a force of 388.8 N. What is the cheetah's mass?
72 kg
388.8/5.4
What force stops a rolling soccer ball out on the grass?
friction
If an unbalanced force acts on an object, the objects motion does not change.
False. Unbalanced forces cause a change in motion.