Forces 1
A force that opposes motion
Friction
What force is caused by gravity acting on a mass
Weight
An object is sitting at rest on a table. Are the forces balance or unbalanced?
balanced
What type of force is used to stop a car?
Friction.
What unit are forces measured in?
Newtons
Four factors that affect braking distance (be specific)
Wet roads
Icy roads
Badly maintained brakes
Bald tyres
Passengers / mass
Speed
What force keeps the Earth in orbit?
Gravity
Provide an example of when friction is increased.
football boots, braking in a car, etc
What is the formula for mechanical advantage?
Mechanical advantage= load/ effort
The north pole of the magnet will be attract to what part of another magnet
south pole
What item measures forces?
spring balance
Define the term contact force.
A force that causes an effect through physical contact.
What is the mechanical advantage with a load of 200N and an effort of 50N?
4
What are the thee forces that act upon a car rolling to a stop?
Gravity, Friction, and Air Resistance.
How does opening a parachute impact air resistance?
Provide an example of when friction is reduced.
lubrication in machines, ice skates on ice, wheels in machines etc.
List three everyday examples of a pulley
crane, gym weights, lift, etc.
Define the term non-contact force.
A force that causes an effect without physical contact.
What is the speed of gravity on earth?
9.8m/s2
What is the force that opposes gravity when a book is resting on a table?
The Normal Force.
Give 3 examples of simple machines
Screw, ledge, pulley, wheel and axel, incline plane, wedge, lever
What direction do magnetic field lines point—away from which pole and toward which pole?
Magnetic field lines always point away from the north pole and toward the south pole of a magnet.
What type of force is equal in magnitude and opposite in direction? And is observed in stationary objects
A Balanced Force.
What two factors impacts the force of gravity.
Mass and distance.
What parts of the atom are moved during static electricity?
Electrons
Describe how break pads in a car increase friction
When you press the brake pedal, the brake pads push against the spinning wheels. This creates friction, which slows the wheels down and helps the car stop safely.
Four contact forces
Friction
Air resistance
Tension
Normal contact
What type of lever is a seesaw?
A First Order Lever.
What type of lever is a fishing rod?
A Third Order Lever.
What type of lever is a wheelbarrow?
Second Order Lever.