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.
A box is pushed with 15 N to the right and 5 N to the left. What is the resultant force?
10 N to the right
If two forces of 10 N act in opposite directions on an object, the resultant force is:
0
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 unit for force?
Newtons
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.
A force is a __ or a ___?
push or pull
What is a force that acts upon a car rolling to a stop?
Gravity/ Friction/ Air Resistance.
Does opening a parachute increase or decrease air resistance?
increase
Provide an example of when friction is reduced.
lubrication in machines, ice skates on ice, wheels in machines etc.
Give an everyday example 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— from north to south, or from south to north?
away from the north pole and toward the south pole
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
Which statement about gravity is correct?
A. Gravity only acts on heavy objects.
B. Gravity pushes objects away from Earth.
C. Gravity attracts objects towards Earth.
D. Gravity only acts when objects are moving.
C
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.