Motion
What can we calculate from a distance-time graph?
Velocity
What is the difference between mass and weight?
Weight is a force and is measured in N
Mass is the matter inside of an object
What is work?
Work occurs when a force moves an object, resulting in the transfer of energy to that object
When energy is transfered we lose a little bit to some things (often ignored in calculations in exam questions), what are three examples?
Heat, light, sound...
What can we calculate from a velocity-time graph?
Acceleration
When force is applied to an object, what sort of energy does it gain?
Kinetic
Define power
The rate of doing work, or the rate of transfer of energy
True or false: energy can be created and destroyed
False
If the line on a v-t graph is straight what does this tell us?
If a car is moving at a constant speed, will forces be balanced or unbalanced?
Balanced
What is the unit for power?
Watts (W)
When an object is lifted against the force of gravity, what energy does it have?
Epgrav
If there is a horizontal line on a v-t graph, what does this show?
Constant speed
If a car is accelerating at a constant rate, will forces be balanced or unbalanced?
Unbalanced- more force in the direction of the movement
What happens to work when you lift something straight up instead of pushing it up a ramp?
Stays the same
If two people are standing at the top of the waterslide, one had a mass of 50kg and the other had a mass of 70kg, who would have the greater Epgrav?
70kg person