Work, Energy and Power

The SI unit of energy is _________________?

• Newton metre (Nm)
• Newton per metre  (N/m)
• Joule (J)
• Joule per metre (J/m)   

1  When a ball accelerates down a slope, it _________________

• gains both kinetic energy and potential energy
• gains kinetic energy but loses potential energy
• gains potential energy but loses kinetic energy
• neither gains nor loses both kinetic energy and potential energy     

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A man of weight 900 N walks up a hill of height 10 m. What is the total work done?

• 0 J       
• 90 J
• 900 J   
• 9000 J             

Tags

NGSS.MS-PS3-2

A boy lifted his school bag of mass 3 kg from the floor to his lap through a height of 0.5 m. What is the gravitational potential energy gained by the bag?

• 1.5 J                 
• 15 J     
• 150 J
• 1500 J

Tags

NGSS.MS-PS3-4

What is mass?

• It is the amount of matter in a body
• It is the amount of force in a body
• it is the gravitational force acting on a body
• it is the kinetic force acting on a body

Tags

NGSS.MS-PS3-1

What is weight?

• It is the amount of matter in a body
• It is the amount of force in a body
• it is the gravitational force acting on a body
• it is the kinetic force acting on a body

Tags

NGSS.MS-PS2-4

What happen to the gravitational force on a body when u move away from earth's surface?

• it becomes stronger
• it becomes weaker
• it remains the same
• it become stronger first then it weakens

Which of the following about mass and weight is true?

• weight is independent of gravity while mass is dependent of gravity
• mass is independent of gravity while weight is dependent of gravity
• Both are independent of gravity
• Both are dependent of gravity

What is the formula for weight?

• W = m/g
• W = g/m
• W = mg
• W = mg²

What is the formula for K.E.?

• (1/2)mv
• (1/2)m²v
• (1/2)mv²
• mv²

Tags

NGSS.MS-PS3-1