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
Name 3 safety features in cars that reduce the effect of forces
seat belts, air bags, crumple zones, head rests, bull bars
What force keeps the Earth in orbit?
Gravity
Provide an example of when friction is increased.
football boots, braking in a car, etc
What happens when 2 south poles of a magnet are brought together?
they repel each other (like poles repel)
The north pole of the magnet will be attract to what part of another magnet
south pole
What item measures forces?
spring balance or Force meter, or a Newton meter
Define the term contact force.
A force that causes an effect through physical contact.
What is the force that attracts the metals iron, cobalt and nickel?
Magnetism
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 uses of magnets
fridge magnets, closure on bag/phone case, screw drivers.
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 contact forces
bouyancy, friction, air resistance, tension, applied force, normal force
Name 2 uses of an electromagnet (one that can be turned on and off)
car yards to pick up magetic metals, surgeons use electromagnets to get metals out of eyes.
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 units is weight measured in?
Explain how a compass works
A compass has a magnetized needle that rotates to line up with Earth's magnetic field. The ends point to what are known as the north magnetic pole and the south magnetic pole.
What are the 3 effects of forces ?
They change the speed, shape and direction of an object.