7th 4th 9 Wks Exam

Newton's law of motion describes the relationship of force, mass, and acceleration. Write the equation.

• M=F/A
• F=MA
• A= F/M
• All of the above

Potential energy due to gravity

• gravitational potential energy
• mechanical energy
• kinetic energy
• elastic potential energy

An object with a mass of 10 kg is accelerated upward at 2 m/s². What force is required? ____ Newtons

What happens to an object in motion if all forces acting on it are balanced?

• It will stop moving

• It will continue moving at the same speed and direction

• It will accelerate

• It will change direction

Kinetic energy + potential energy

• electrical energy
• thermal energy
• sound energy
• mechanical energy

One joule equals the amount of work that is done when 1N of force moves an object over a distance of

• 1cm.

• 1m.

• 1 km.

• none of the above

Which is NOT an example of the use of mechanical energy?

• solar panels powering a building

• beating a drum

• pushing a shopping cart

• playing music on a piano

A 50 kg skater pushed by a friend accelerates 5 m/sec².  How much force did the friend apply?

• 45 N
• 15 N 
• 10 N
• 250 N

A student walks 10 meters north, then 6 meters south, and finally 4 meters north. What is the total distance traveled and the displacement?

What is the net force?

• 5000 N right
• 4000 N right
• 40 N left
• 4000 N left