Motion
What is the difference between speed and velocity?
Velocity includes a direction
What is the definition of a force?
It is a push or a pull
The equation for work
work = fd
What 2 things make up mechanical energy?
Kinetic and potential energy
The average kinetic energy of particles
What is temperature?
What is the equation to calculate acceleration?
af-ai/t
The force acting right is 5N and the force acting left is 10 N. We call these _________forces
Unbalanced forces / Net force
You go rock climbing and carry a back back that weights 70N. You travel 30 m in 600s. What was your power?
3.5 W
The type of energy related to the motion of particles.
thermal energy
The transfer of thermal energy from warmer to cooler object.
What is heat?
What are 2 ways you can change acceleration?
Change speed, direction or speed and direction
What are 2 factors that affect friction?
The type of surface and how hard they press together.
Why is no machine 100% efficient?
some work is lost due to friction?
What does the law of conservation of energy state?
Energy is not created nor destroyed but transferred from one form to another.
A heat transfer that occurs in fluids.
What is convection?
A positive diagonal slope on a velocity time graph represents what kind of acceleration?
Constant acceleration
Two objects exert gravity on each other. If object one has 2x the mass as object two, how does the force of gravity on them compare?
They have the same force of gravity.
The kinetic energy of a golf ball is measured to be 143 J. If the golf ball has a mass of 47g. What is its speed?
About 78 m/s
What energy transformations take place when you use a flashlight.
When 3.0 kg of water is cooled from 80.0°C to 10.0°C, how much heat energy is lost? Specific heat of water is 4179 J/kgC
877590J
15s
In newton's first law, an object will remain at rest unless acted on by nonzero net force. This is also called the LAW OF ___________
inertia
A 1 kg ball and 2kg ball travel in opposite directions at 1m/s. If they hit each other and stick together, what would be their new velocity?
0.33m/s
A dog has a kinetic energy of 40 J and mass of 20 kg. What is its velocity?
2m/s
The temperature of a sample of iron with a mass of 10.0 g changed from 50.4°C to 25.0°C with the release of 47 Joules of heat. What is the specific heat ?
185 J/kgC