Newton's Laws

Safety belts protect people in cars in the event of an accident because, according to Newton’s Laws of Motion, when an impact causes the car to suddenly change its motion, -

• the people in the car will continue to move in the same direction and at the same speed as before the impact.
• the speed of the car always increases, giving it greater force since the mass will remain the same.
• the speed of the people always increases, since now they have, not one, but two forces acting on them.
• the car now has a greater overall mass - its own mass plus the mass of the object by which it has been struck.

Tags

NGSS.MS-PS2-2

A ball thrown into the air starts out with an initial upward velocity, but eventually slows and stops before falling back to the ground. Which of the following contributes the most to the change in motion of the ball?

• The initial force with which the ball is thrown
• The downward force of gravity
• The resistance against the atmosphere
• The increase of inertia

Tags

NGSS.MS-PS2-2

According to Newton’s Law of Inertia, an object that is moving will change its motion only if what kinds of forces act on it?

• Constant forces
• Unbalanced forces
• Unbalanced forcesStrong forces
• Gravitational forces

Tags

NGSS.MS-PS2-2

What is the unit to MEASURE force?

• Kilogram
• Meter
• Pascal
• Newton

Tags

NGSS.MS-PS2-2

What is Newtons 3nd law of motion?

• An object will stay in motion until something acts on it
• For every action there is an equal and opposite reaction
• F=MxA

What is Newton's 1st law of motion?

• An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force
• F=MxA
• For every action there is an equal and opposite reaction

F=MA
An object of mass 10 kg is accelerated upward at 2 m/s².  What force is required? 

• 20 N
• 2 N
• 5 N
• 0 N

Why is person B having a hard time moving down the hill?

• Person B has more friction than person A.
• Person B has the same friction as person A.
• Person B is out of shape.
• Person B has less friction has person A.

Tags

NGSS.MS-PS2-2

When an unbalanced force acts on an object, the force ______________________.

• changes the motion of the object

• is cancelled by another force

• does not change the motion of an object

• is equal to the weight of the object

• 1st
• 2nd
• 3rd