Momentum and WEP

Question 1

Linear momentum

Answer 1

• the product of the mass and the velocity of the object

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Question 2

Newton’s second law

Answer 2

• the net force acting on an object is equal to the rate of change of momentum

Question 3

law of conservation of linear momentum

Answer 3

• the total linear momentum of an isolated system remains constant (is conserved)

Question 4

elastic collision

Answer 4

• a collision in which both momentum and kinetic energy are conserved

Question 5

inelastic collision

Answer 5

• a collision in which only momentum is conserved

Question 6

impulse

Answer 6

• the product of the net force and the contact time

Question 7

work done

Answer 7

• the product of the displacement and the component of the force parallel to the displacement

Question 8

gravitational potential energy

Answer 8

• the energy an object possesses due to its position relative to a reference point

Question 9

kinetic energy

Answer 9

• the energy an object has as a result of the object’s motion

Question 10

mechanical energy

Answer 10

• the sum of the gravitational potential energy and the kinetic energy at a point

Question 11

law of conservation of energy

Answer 11

• the total energy in a system can not be created nor destroyed; only transformed from one form to another
• in the absence of air resistance or any external forces, the mechanical energy of an object is constant

Question 12

work-energy theorem

Answer 12

• the work done by a net force on an object is equal to the change in the kinetic energy of the object

Question 13

power

Answer 13

• the rate of change of work done

- the rate in which energy is transferred

Question 14

efficiency

Answer 14

• the ratio of output power to input power

Question 15

the watt

Answer 15

• the power when one joule of work is done in one second