Forces

A force is ____.

• a push or pull that can cause movement

• a magnet

• when someone does not work

According to Newton’s first law of motion, a moving object that is not acted on by an unbalanced force will

• remain in motion.
• eventually come to a stop.
• change its momentum.
• accelerate.

A sled sliding on a flat, icy surface with a constant velocity is best described by

• Newton’s first law of motion for objects at rest.
• Newton’s first law of motion for objects in motion.
• Newton’s second law of motion.
• Newton’s third law of motion.

A person steps out of the boat and onto the dock.  As the person moves forward onto the dock, the boat moves backward.  Which statement best describes the backward motion of the boat as the person steps forward?

• For every action there is an equal and opposite reaction.
• Every mass exerts a force on every other mass.
• An object at rest tends to stay at rest.
• Friction opposes the motion of an object.

What is the definition of "weight"?

• the force in which gravity pulls on an object
• the time it takes to get on a ride 
• the amount of matter in an object
• the size of an object

 267.5 N unbalanced force applied to push a stuffed chair across the room, causing an acceleration of 4.2 m/s2. What is the mass of the chair?

• 26.75 kg
• 63.69 kg 
• 263.3 kg 
• 1123.5 kg

Which of these best describes why your weight (on Earth) would change on another planet?

• weight doesn’t change, no matter where you are
• different planets have different gravitational pulls
• In general, the smaller the planet, the greater weight
• dehydration effects on different planets change weight

A push or a pull is called a

• Gravity

• Force

Rockets are launched into space using jet propulsion where exhaust accelerates out from the rocket and the rocket accelerates in an opposite direction.

• Newton's 1st Law
• Newton's 2nd Law
• Newton's 3rd Law
• None of them

Force = Mass x Acceleration

• Newton's 1st Law
• Newton's 2nd Law
• Newton's 3rd Law
• Newton's 4th Law