Forces
What instrument is used to measure force?
spring scale
F=ma, F=m*(acceleration of gravity), F=m*9.8
What is Newtons first law of motion?
An object in motion stays in motion and an object at rest stays at rest unless acted on by an opposing force
same time
what is the formula for momentum
p=mv
What is it call when forces on an object are equal.
Balanced force
What is the force of gravity?
9.8m/s
calculate the weight of a person with a mass of 67.2kg.
658.56N
every action has an equal and opposite reaction
two 10kg objects are dropped from a building. The red one is dropped straight down and the blue one is thrown so it also has horizontal motion. which object hits the ground first
same time
what is the units for momentum?
kg*m/s
A person with a mass of 63 kg is accelerated to 4 m/s2. How much force was applied to him?
252N
a man jumps out of a plane with a parachute. what force slows down his fall?
air resistance or drag
Calculate the weight of a dog with a mass of 15kg
147N
what is the path of a projectile called
parabola or trajectory
A car weighs 435kg and is moving at 4m/s, what is its momentum?
1740kg*m/s
a force of 35N acts upon a 4kg block. calculate the acceleration of the object.
8.75m/s2
What type of friction opposes two surfaces that are already sliding.
Sliding friction
calculate the mass of a dog that weighs 53N
5.41kg
law of inertia
is projectile motion one dimensional and what are the dimensions?
no, it is two dimensional, vertical and horizontal
A car that weights 450kg and is moving at 35 m/s has what momentum?
15,750kg*m/s
If you hit a wall with 650N how many Newtons does the wall exert back
650N
What is terminal velocity
Why is mass more fundamental than weight
mass doesn't change, weight depends on gravity
which law is known as the law of conservation of momentum
Newtons 3rd law
which dimension has constant speed and which has acceleration?
horizontal has constant speed, while vertical has acceleration
calculate the mass of a car that moving at 25m/s with the momentum of 3500kg*m/s.
140kg
Why can't you hit a feather with a large force?
Because the feather cannot hit you back with a large force