Newton's Laws
Which of Newton's laws explains inertia?
Newton's 1st Law
What does the Law of Conservation of Momentum state when two objects collide, What happens to their combined momentum?
It does not change
What do balanced forces equal?
0 Net force
What is the force that opposes motion between two surfaces that are touching?
Friction
What does a single fixed pulley change on an object?
It changes the direction of the force
Which of Newton's Laws states that for every action there is an equal and opposite reaction?
Newton's Third Law
What activity best displays the use of conservation of momentum?
Billiard balls colliding
What is the net force of a combined force of 7 N north with a force of 5 N south?
What factors affect a wooden block's friction across a surface?
The surface in contact
The amount of work an object/person does per second?
Power
What does Newton's second law state about the acceleration of an object? What is the formula?
The acceleration will increase. F=ma
What is the formula for momentum?
Momentum (p) = mass (m) x velocity (v)
What is the net force being used to move a bed if Ann exerts 25 N of force to push the foot-end of the bed while Mary exerts 20 N of force pulling the head-end of the bed?
45 N of force forward
What type of friction occurs when brakes are applied on a car or bicycle?
Sliding friction
What must happen for work to be done?
A force must be applied, the object must also go in the direction the force is applied
What force is necessary to accelerate a 1,250 kg car at a rate of 40 m/s/s, using this formula (F=ma)?
50,000 N
Why can you run into a person and knock them over if they are standing still?
Because of the runners momentum transfer
If Fredrick is pushing a box with 100 N of force north, and Gerald pulls the same box with 89 N of force south. What is the net force on the object?
11 N to the north
What type of friction causes a sky diver's acceleration to change as he or she falls?
Fluid Friction
Given the formula (F=ma), how much force is needed to accelerate a 70 kg rider and her 200 kg motor scooter at 4 m/s/s?
If both a bowling ball and a golf ball are rolling at the same velocity, which ball has more momentum and why?
The bowling ball because it has more mass
Which way will Karl's car travel when it is going south with 4,000 N of force and it crashes into Jason's car going north with 3,750 N of force?
Karl's car will continue going south because it has a larger force measurement
List the 4 types of friction in order of least to greatest?
Fluid, Rolling, Sliding, and Static friction
In the problem above, the box is pushed in 10 s. What is the power?