Motion
How far will an object in free fall fall in five seconds?
125m
Describe mechanical advantage.
MA is equal to the output force divided by the input force. (Length divided by height).
a Newton
The force required to move a 1 kg object 1 meter.
Does air resistance increase or decrease the acceleration of falling objects?
Decreases.
What is the efficiency of a machine that requires 100j of energy to do 35 j of work?
35%
The Conservation of Momentum.
Momentum is always equal before and after a collision. The momentum of a system is always unchanged provided there is no outside influence.
Calculate the speed of a bowling ball that moves 8 meters in 4 seconds.
2 m/s
What is the potential energy of a 1 kg book lifted 4m? g = 10m
40 J
Newtons' Third Law
Every action has an equal and opposite reaction. The two together are an interaction.
Calculate the speed of a skateboarder who accelerates from rest for 3 seconds down a ramp at an acceleration of 5 m/s^2.
15 m/s
What is the power expended when a 20 N force pushes a cart 3.5 m in 0.5 seconds?
140 W
What is impulse?
i = ft
Calculate the vertical distance an object dropped from rest would cover in 12 seconds if it fell freely.
720M
Josh lifts 20kg 5 meters in 2 seconds; Max lifts 20 kg 5 meters in 3 seconds. Who does more work?
Neither. They do the same work.
Write the equation for distance traveled in free fall.
d=1/2gt^2