power and work 2

The SI unit of energy is _________________?

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

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             

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

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

What is the formula for weight?

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

What is the work done by the man?

• 0 J
• 65 J
• 6500 J
• 0.0065 J

What is an equivalent formula for force?

• $F=d\times t$

• $a=\frac{F}{m}$

• $F=\frac{W}{d}$

• $m=F\times a$

Work is measured in which units?

• Newtons

• Joules

• Watts

• Joule/sec

Power is measured in which units?

• Newtons

• Joules

• Watts

• Joule/sec

____ is being done when a force is exerted on a wagon while it is being pulled up a hill.

• Power

• Force

• Work