First Law
The tendency of an object to resist a change in motion is called ____.
Answer: Inertia
The unit for force is ______.
Answer: Newton (N)
State Newton’s Third Law.
Answer: For every action, there is an equal and opposite reaction.
Name the strongest type of friction.
Answer: Static.
A push or pull on an object is called a ____.
Answer: Force
Why do passengers move forward when a bus stops suddenly?
Answer: Inertia keeps them moving forward.
Write the equation for Newton’s Second Law.
Answer: F = m × a
When you push water backward while swimming, what happens?
Answer: Water pushes you forward.
Name the weakest form of friction.
Answer: Rolling
A rocket launch: Which laws apply?
Answer: All three laws apply.
What does Newton’s First Law say about objects at rest?
Answer: They stay at rest unless acted on by an unbalanced force.
How does mass affect acceleration for the same force?
Answer: Greater mass = less acceleration.
A rocket moves upward because ____.
Answer: It pushes exhaust gases downward.
Name the two variations of fluid friction.
Answer. Water and air resistance.
In soccer, when a ball bounces off a wall, which law is seen?
Answer: Third Law.
If net force is zero, what is true about the motion?
Answer: It stays at rest or moves at constant velocity.
A 27 kg object accelerates at 3 m/s². What is the net force?
Answer. 81N
Why does a balloon fly around when released?
Answer: Air rushes out, pushing the balloon in the opposite direction.
What kind of friction is applied to a soccer ball kicked on grass?
Answer. Rolling.
What force or forces are acting on a ball that has been thrown into the air?
Answer: Gravity and fluid friction (air resistance)
An object moving at constant velocity will continue moving unless ____.
Answer: Acted on by an unbalanced force.
Find the acceleration of an object that has a mass of 52kg and a force of 19N.
Answer. 2.7368 m/s²
What is the action force when you walk forward?
Answer: Your foot pushes backward on the ground.
When a hockey puck slides until friction stops it. Which law and kind of friction applies?
Answer: First Law and kinetic
State the first law in its entirety.
Answer. An object at rest will stay at rest unless acted upon by an outside unbalanced force. An object in motion will stay in motion unless acted upon by an outside unbalanced force.