Newton Laws, Potential, Kinetic, Force and Motion

Newton's 3rd Law of motion states that....

• A object in motion/rest stays in motion/rest until it is acted upon by an unbalanced force.

• Force is equal to the mass and the acceleration of an object.

• For every action there is an equal and opposite reaction.

How do forces act on an object?

• They usually act alone

• They act in pairs

How is this an example of Newton's Third Law?

• Only the ball is applying a force to the soccer players head

• Only the soccer players head is applying the force to the ball

• The are both exerting an equal force on each other

When a small car pushes a big truck, the truck applies an equal and opposite force on the car

• True

• False

When a cannon fires a cannonball we observe Newton's third law. Which is the reaction force?

• The cannon moving forward

• the cannon moving backwards

• the cannonball moving backwards

• The cannonball moving forward

A book rests on a table.  The force of gravity pulls down on the book with a force of 20 newtons. What prevents the books from accelerating downward ?   

• The table presses back up on the book with an equal and opposite force of 20 newtons.

• The table presses back up with a force greater than 20 Newtons

• The tale and the book together are accelerating downwards at 9.8 m/sec2

• The inertia of the book holds it up

The units of force are:

• Joules

• Newtons

• Newtonmeters

• Newtons per meter squared

What is acceleration due to gravity on Earth?

• 98 m/s²

• 9.8 m/s²

• 0.98 m/s²

A woman is driving her car and needs to suddenly break because a deer crosses her path. When she slams on her breaks, she flies forward, only being stopped by her seatbelt restraint.

• 1st Law of Inertia

• 2nd Law of Acceleration

• 3rd Law of Action-Reaction

A rocket is launching on a mission to the International Space Station. Upon takeoff, a large jet of fire comes from the bottom of the spacecraft towards the ground. The rocket then begins to move towards the sky.

• 1st Law of Inertia

• 2nd Law of Acceleration

• 3rd Law of Action-Reaction