Forces & Movement
What is the SI unit used to measure force?
Newton (N)
What type of energy does a moving object have?
Kinetic energy
What is the formula to calculate speed?
speed = distance ÷ time
What is the turning effect of a force called?
Moment
What is a simple machine that is a sloping surface called?
Ramp (inclined plane)
Which of these is a drag force?
a) thrust
b) air resistance
c) friction
b) air resistance
What type of energy is stored in fuels, food, and batteries?
Chemical energy
Name three different units for speed
m/s ; km/h ; mph
What is the pivot point of a lever called?
Fulcrum
What simple machine uses a rope and wheel to lift objects?
Pulley
What is the force between two objects that are touching?
Friction
What type of energy is stored in objects that are high above the ground?
Gravitational potential energy
If an object is moving at a constant speed, are the forces on it balanced or unbalanced?
balanced
What is the unit for moment?
N·m
What two quantities are measured in joules?
Work & Energy
What is the total overall force acting on an object called?
Resultant force
What law states that energy cannot be created or destroyed?
Law of conservation of energy
If a car is accelerating, are the forces acting on it balanced or unbalanced?
Unbalanced
In a Class 2 lever, is the effort, fulcrum, or load in the middle?
Load
What is the definition of work? [physics]
Energy transferred when a force moves an object
What is the maximum speed reached by a falling object when drag equals weight?
Terminal velocity
What term describes how much useful energy is transferred compared to the total energy input?
Energy efficiency
If object a (80 km/h) and object b (60 km/h) travel towards each other (a→ ←b), how do we calculate their relative speed to each other?
Add the speeds together
= 80 + 60
= 140 km/h
Two people are on a seesaw. The seesaw is in equilibrium. What does this tell us about the moments of the two forces?
The moments are balanced (equal and opposite)
In an pulley system, if the force needed (effort) decreases, what must increase?
distance