Inertia
What does Newtons First Law say about an object in motion?
It stays in motion unless acted on by an unbalanced force
What does F=ma stand for?
Force=Mass x Acceleration
What does Newtons Third Law State?
For every action, there is an equal and opposite reaction
Wearing a seatbelt in a car crash is related to which law?
Law 1- Inertia
What are the units for force?
Newtons (N)
What happens to a soccer ball if no on kicks it
It stays at rest
If you double the mass of an object, what happens to the force needed to move it?
The force also doubles
When you push against a wall, what does the wall do?
It pushes back with equal force
Why is it harder to stop a full shopping cart than an empty one and what law is this
Because it has more mass, so more force is needed (law 2)
What is the force on a 4 kg object accelerating at 3 m/s squared?
12N
Why do passengers jerk forward when a car suddenly stops
Because their bodies want to keep moving because on Inertia
A 10 kg object accelerates at 2 m/s squared. What is the force?
20N
Why does a balloon fly when you let it go?
What law is shown when a swimmer pushes off a wall
Law 3- Action- Reaction
If force= 30N and acceleration= 10 m/s squared. Whats the mass
3kg
True or False: Inertia is a force
False. Inertia is a property of matter
What is the acceleration if a 15N force is applied to a 3kg object?
5m/s squared
Jumping off a small boat pushes it backward. Why?
Because your push on the boat causes an equal and opposite reaction.
A soccer ball sits still until kicked. Which law?
Law 1- Inertia
A force of 50N moves a 10kg box. Whats the acceleration
5m/s squared
Which has more inertia: a bowling ball or a tennis ball? Why?
Bowling ball; because it has more mass
An object moves with 8m/s squared acceleration when pushed with 40N. What is the mass?
5kg
Rocket engines push gas out fast. What happens to the rocket?
It moves in the opposite direction
Explain how all three laws apply to a person riding a skate board?
Inertia keeps riders moving,
push=acceleration (f=ma),
Skateboard eacts to foot push (Action - Reaction)
If you triple the force on an object and its mass stays the same, what happens to the acceleration
It triples.