Newton's 1st Law
This law is also called the law of ______.
Inertia.
This is the formula for Newton’s 2nd Law.
F=ma
Force = mass x acceleration
Complete the law: For every action, there is an equal and opposite ______.
Reaction.
A ball sitting still will not move unless this happens.
A force acts on it.
An object at rest stays at rest unless acted on by this.
Unbalanced Force.
If the force on an object increases, its acceleration will do this.
Increase.
When you push on a wall, the wall pushes back on you. This is Newton’s ___ Law.
Newton's 3rd Law.
When a car stops suddenly, your body keeps moving forward because of Newton’s ___ Law.
Newton's 1st Law.
A hockey puck slides on ice for a long distance mostly because there is very little of this force slowing it down.
Friction.
If two objects are pushed with the same force, the one with less mass will have more of this.
Acceleration.
A rocket rises because hot gases are pushed downward, and the rocket is pushed this way.
Upward.
Why is it easier to push an empty shopping cart than a full one?
The empty cart has less mass, so it takes less force to accelerate it.
A passenger without a seatbelt lurches forward when the driver slams the brakes. Explain why using Newton’s 1st Law.
The passenger’s body wants to keep moving forward because objects in motion stay in motion unless acted on by an unbalanced force.
A 5 kg object and a 10 kg object are pushed with the same force. Which one accelerates more, and why?
The 5 kg object, because less mass means greater acceleration with the same force.
When a swimmer pushes water backward, what happens to the swimmer, and why?
The swimmer moves forward because the water pushes back with an equal and opposite force?.
A soccer player kicks two balls with the same force: one light and one heavy. Which ball speeds up more, and why?
The lighter ball, because less mass means more acceleration.
A tablecloth is pulled quickly from under dishes, and the dishes barely move. Why does this work?
The dishes have inertia, so they resist changes in motion and tend to stay at rest.
A small car and a truck have the same acceleration. Which one has more force acting on it, and why?
The truck, because if acceleration is the same, the object with more mass needs more force.
A cannon fires a cannonball forward and recoils backward. Why does the cannon move backward even though it is much heavier?
The cannonball and cannon exert equal and opposite forces on each other, but the heavier cannon accelerates less because it has more mass.
A student says, “Action and reaction forces cancel each other out, so nothing should move.” What is wrong with that thinking?
The forces act on different objects, not the same object, so they do not cancel each other out.