1st Law
What is Newtons 1st Law?
An object in motion will stay in motion with the same speed and an object at rest will stay at rest unless acted upon by an unbalanced force
What is the formula for Newton's second law?
F = ma
State Newton’s third law of motion.
For every action, there is an equal and opposite reaction
Calculate the force needed to accelerate a 10 kg object at 3 m/s².
30 N
A sled is pushed with 10 N of force. If it accelerates at 2 m/s^2, what is its mass?
5 kg
How would an object gain inertia?
It has to gain mass
If a 5 kg object accelerates at 2 m/s², what is the force applied to the object?
10N
If you push against a wall, why doesn’t it seem to move?
The wall exerts an equal and opposite force against you, but typically its mass is much greater
What is the mass of an object which has 50 N of force applied to it causing it to accelerate at 10 m/s²?
5 kg
What force is required to bring a 12 kg object to an acceleration of 4 m/s^2?
48 N
Why does a soccer ball eventually stop rolling on grass?
Due to the force of friction acting on it.
What happens to the acceleration if the force is doubled and the mass stays the same?
The acceleration doubles.
Explain how rocket propulsion demonstrates Newton's third law.
Gas is expelled downward, forcing the rocket upward with an equal and opposite force.
A 2 kg object is subjected to a net force of 16 N. What is the acceleration?
8 m/s^2
A force of 30 N is used to move a 5 kg box. What acceleration does the box experience?
6 m/s^2
Give an example of Newton's first law in everyday life.
A book remains stationary on a table until someone pushes it.
A car requires 1000 N of force to accelerate at 2 m/s². Determine the mass of the car.
500 kg
When you walk on a sidewalk, what is the action-reaction pair?
Your foot pushes backward on the sidewalk, and the sidewalk pushes your foot forward.
Calculate the acceleration when a force of 24.5 N is applied to a 3.5 kg object.
7 m/s^2
If the acceleration of an object is doubled by doubling the force, what happens to the mass?
The mass is unchanged
What is inertia?
The resistance to change in motion
How does mass affect the acceleration of two different objects when the same force is applied?
The object with smaller mass will have a greater acceleration.
If two ice skaters push off from each other, describe their motion.
They move in opposite directions with forces equal in magnitude.
A 1500 kg car accelerates at a rat of 2 m/s^2. Calculate the net force applied.
3000 N
A 2500 kg truck pulls a 500 kg trailer with a net acceleration of 3 m/s^2. Calculate the total force exerted.
9000 N