Laws of Motion

When a person jumps horizontally off of the end of an unanchored boat in a lake, the person goes forward and the boat goes backward. This is an example of what Law of Motion?

How much force is needed to accelerate a 60 kg rider and her 240 kg motorcycle at 3 m/s²?

Motion is any change in ___________.

• accelration

• distance

• position

• velocity

The moon orbits our Earth. The opposite would never be true; the Earth would never orbit the moon. One reason is due to the force of gravity. The object ____________ has a greater gravitational force and that determines what satellites orbit around it.

• with the greater mass

• containing mostly water

• with a thicker atmosphere

• with the greater diameter

A student runs two times around a running path at a local park.  Each lap is 3 km.  The student completes the first lap in 20 minutes.  The student then sits on a bench and rest for 5 minutes before completing the second lap in 25 minutes.  Which graph bests represents the student's motion?

• F
• G
• H
• J

A 10 kg mass is dropped from a tall rooftop and accelerates at 9.8 m/s². What is the weight of the dropped object?

• 0 N

• 9.8 N

• 98 N

• 198 N

This equation goes with which law?

• Newton's first law of motion
• Newton's second law of motion
• Newton's third law of motion
• None of these

Two astronauts are playing catch in space. The first astronaut throws the ball; and

• the ball moves, but the astronaut doesn’t.

• the ball moves, and so does the astronaut.

• the ball doesn’t move, but the astronaut does.

• the ball doesn’t move, and neither does the astronaut.

The law of inertia states that a body in motion will remain in motion and a body at rest will remain at rest unless acted upon by a(n) ________________ force.

• balanced

• unbalanced

• equal

• strong

Which statement below is false?

• Weight depends on the force of gravity.

• Mass is the amount of matter in an object.

• Mass is a constant no matter where you are located.

• Weight is a constant no matter where you are located.