UNIT 5 - TEST CORRECTIONS

Force can be

• Pushes only

• Pushes and pulls

• Pulls only

A boy rides a skate board down a hill. Eventually the skate board stops. Which is MOST responsible for causing the skateboard to stop?

• gravity acting on the skateboard

• the mass of the skateboard

• the mass of the boy

• friction acting on the skateboard

A book falls off the desk. What moves the book towards the floor?

• mass

• gravity

• friction

• speed

What will happen to the book if no other forces act upon it?

• book will stay at rest

• mass of the book will increase

• book will begin to move

• gravity on the book will increase

Forces can change the

• slow down or speed up objects only

• movement of objects but only if they were already in motion

• speed, direction or shape of an object

Isaac pushes a box 6 N to the right. Honesty does not want Isaac to move the box so she pushes it 3 N to the left. Will the box move?

• Yes, the forces are unbalanced.

• No, the forces are balanced.

Isaac pushes a box 6 N to the right. Honesty does not want Isaac to move the box so she pushes it 3 N to the left. What is the net force on the box?

• 9 N

• 3 N

• 0 N

• 18 N

What is the net force?

• 3 N

• 3 N, right

• 17 N, right

• 3 N, left

Who wins the tug of war with what net force?

• The person on the left with 20 N
• The person on the left with 80 N
• The people on the right with 20 N
• The people on the right with 100 N

What is the net force?

• 20 N 
• 0 N 
• 400 N 
• 40 N