Module 5 p6

A Teacher applies a force to a wall and becomes exhausted is work done by a force.

• True

• False

A force of 50 N acts on the block at 60°. The block moves horizontally at 3m. How much work is done by the applied force?

• W = 88 J

• W = 102 J

• W = 92 J

• W = 75 J

What is the kinetic energy of a branch measuring 0.78kg, if it rolls down the hill at a velocity of 4.89 m/s?

• W = 11.73 J

• W = 9.33 J

• W = 13.45 J

• W = 10.92 J

A paper flies off a table and free falls to the ground shows a work done by a force.

• True

• False

A rocket accelerates through the space is work done by a force.

• True

• False

A girl pushing a box across a floor shows a work done by a force

• True

• False

Don't leave the tap running while you're cleaning your teeth, shaving or washing (your face or the washing up)

• True

• False

An Olympic Archer applies a force of 120N in pulling back his bow by 0.78 dm. How much energy is stored in the bow?

• W = 23.4 J

• W = 26.9 J

• W = 29.2 J

• W = 19.5 J

If

a = 2i + 6j + k.

b = 3i +4j + 2k.

What is the value of a•b?

• -21

• -32

• 28

• 45

A girl sitting on a stool is a work done by a force.

• True

• False