1 law
Why do passengers in a car jerk forward when the brakes are suddenly applied?
Due to inertia, the same speed the car was traveling, even though the car has stopped
What is the equation for newton?
F=M*a
The amount of inertia an object has depends on the ________ of the object.
mass
an object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction, unless acted upon by an unbalanced (net) external force
What is the net force needed to accelerate a 2000 kg car at 2 m/s²?
F = ma = (2000 kg)(2 m/s²) = 4000 N.
True or false? An object will not start moving unless it is acted on by an unbalanced force.
true
What is Newton's second law?
An object's acceleration depends on 2 things: the size of the force and the object's mass.
True or false? A speeding truck has a large amount of momentum. A small car moving at the same velocity has equal momentum than the truck.
False
''it's easier to push an empty shopping cart than a full one (more mass, less acceleration) and hitting a baseball harder (more force, greater acceleration)''
What force is needed to accelerate a 2000 kg car at 2 m/s²
4,000 N
What is it called when objects resist a change in motion?
Inertia
A 10 kg box is pushed with 50 N of force. What's its acceleration?
5m/s2
What is a moving object's mass times velocity
The momentum.
A swimmer pushes the water backward with their hands and feet (action). The water, in turn, pushes the swimmer forward with an equal and opposite force (reaction), propelling them through the pool.
the 3st law
A 30 kg wagon is pushed with 120 N forward, but 30 N of friction acts backward. What is its acceleration?
90 N / 30 kg = 3 m/s².
An unbalanced force changes an object's motion. What is changing motion called?
Acceleration.
What force is needed to accelerate a 20 kg cart at 3m/s2
60 N
Momentum= __________ X __________.
Mass, Velocity
an object's acceleration is directly proportional to the net force applied to it and inversely proportional to its mass
the 2st law
What is the acceleration of a 10 kg bowling ball pushed with a net force of 30 N
(30 N) / (10 kg) = 3 m/s²
If I went to the moon, my ________ WILL NOT CHANGE
mass
What is the mass of a truck that produces a force of 14,000 N while accelerating at 5m/s2
2,800kg
A bat hits a ball with 1000 N of force. How hard does the ball push back on the bat?
the ball pushes back on the bat with exactly 1000 N of force, but in the opposite direction.
A rocket engine exerts a powerful downward force (action) on the exhaust gases, pushing them out at high speed. In reaction, the gases exert an equal and opposite upward force (reaction) on the rocket, propelling it into space.
the 3st law
A 1000 kg car accelerates at 5 m/s². What force does it produce
5,000 N