Newtons Laws 1
This is required to overcome an object’s inertia.
unbalanced force?
This is a measure of the change in the velocity of a moving object. (speeding up or slowing down)
acceleration?
One object pushing on another will always receive a push in return. True or false.
True
If the acceleration of a bowling ball is 3 m/s2, and the mass of the bowling ball is 5kg, what is the force that the ball will place on the pins?
15 N
Newton’s Second Law can be summarized using this equation.
force = mass x acceleration?
The unit for force
What is the Newton?
If forces are cancelled out, they are Balanced or Unbalanced forces.
Balanced
If a horse is accelerating at 1.5 m/s2 and has a mass of 500 kg, what is the force it would have if it ran into a fence?
750 N
The tendency of an object to resist a change in its motion. This is the definition of ________
inertia
When mass increases, what happens to inertia?
increases?
A car and a train are going the same speed. The car is easier to stop because of this.
less mass and less inertia
A dog with an acceleration of 2 m/s2 applies a force of 20 newtons on a wall she jumps on to catch a frisbee. What is the dog's mass?
10 kg
What causes a ball that has been kicked across the ground to stop?
Friction
Objects with more mass are ______ to set in motion.
harder
As an objects mass increases, what happens to its momentum?
Increases
In a vacuum chamber, what is the only force acting on objects? (name of force and number needed)
Gravity - 9.8 m/s2
According to Newton’s Second Law, if the force increased but the mass remained the same, what happens to acceleration?
The objects acceleration increased.
A bowling ball and a feather will fall at the same speed and acceleration in a vacuum because there is no...
air resistance, drag, or fluid friction.
A car is moving north at a speed of 60km/h with 1000N of force and is also experiencing 1200N of force in the south direction.
1. Is the car accelerating, staying still or decelerating?
2. Name one force that's acting in the south direction?
1. Decelerating.
2. Fluid friction (air resistance), rolling friction (road and tyres), sliding friction (brake pads).
A boy with 50 kg of mass is applies a force of 75 N to a kickball. What is the ball's acceleration?
3 m/s2