Newtons Law
A
A
The law of inertia
Is friction a contact or non contact force?
contact
What is force?
push or pull
What scientist discoverd gravity? (full name)
Sir Issac Newton
the pull of all objects toward the center of the Earth
gravity
mass X acceleration =
force
What unit is used to measure force?
Newtons
Stored Energy
Potential energy
When all the forces on an object are equal & the net force is zero.
Balanced Force
Which force produces a change in motion?
unbalanced force
the energy of a moving object
Kinetic Energy
An automobile you are riding in suddenly stops, but you continue to go forward.
Newton's 1st Law
The combination of all the forces acting on an object is the is
Net Force
"For every action, there is an equal and opposite reaction."
Newtons 3rd Law
When two objects rub against each other, what is created?
friction
The harder you hit a baseball the further it will go.
Newtons 2nd Law
Sarah applies identical forces to four blocks of wood of different masses. Which block of wood will move the fastest?
O a block of mass 7 kg
O a block of mass 5 kg
O a block of mass 4 kg
O a block of mass 2 kg
a block of mass 2 kg
When a cannon fires a cannonball we observe Newton's third law. Which force is the reaction force?
the cannon moving backward
What would cause an object moving at a constant speed to increase speed?
O The increase in speed is caused by a balanced force.
O The increase in speed is caused by an unbalanced force.
O The increase in speed is caused by a change in direction.
O The increase in speed is caused by a frictional force.
The increase in speed is caused by an unbalanced force.
John let go of a balloon and it shots forward.
Newtons 3rd Law
Which types of forces can impact the motion of an object?
O only some contact forces
O only some noncontact forces
O all contact forces and all noncontact forces
O all contact forces and only noncontact forces due to gravity
all contact forces and all noncontact forces
To be considered moving, which change must occur?
O speed
O position
O mass
O direction
position
Which statement is true?
O As an object falls freely, its speed decreases.
O As an object falls freely, its speed increases.
O As an object falls freely, its speed remains constant.
O As an object falls freely, its speed increases and then decreases.
As an object falls freely, its speed increases.
Which action results in increased friction?
O adding wax to skis
O polishing a metal surface
O applying sand to a road
O applying grease to a bicycle chain
applying sand to a road
A student is pushing a toy car down a ramp. If the student places the toy car on the ramp again and increases the force used to push the toy car, what will happen?
O The kinetic energy will increase, and the toy car will go faster.
O The kinetic energy will decrease, and the toy car will go faster.
O The potential energy will increase, and the toy car will go slower.
O The potential energy will decrease, and the tov car will go slower.
The kinetic energy will increase, and the toy car will go faster.