Forces Review

Which best describes frictional forces?

• Force that is perpendicular to the surface in contact with the object

• Force that always points straight down

• Force that is parallel to the surface in contact with the object

• Force in cables, ropes, strings, etc.

Which best describes the normal force?

• Force that always points straight up

• Force that is parallel to the surface in contact with the object

• Force that is perpendicular to the surface in contact with the object

• Force that always points straight down

Which best describes the gravitational force?

• Force that always points in the -y direction

• Force that always points down towards the surface of the earth

• Force that is always perpendicular to the surface in contact with the object

• Force that only exists on earth

Draw and label (include ons, bys) a qualitative force diagram that represents the situation. Use marks on the vectors to indicate which forces are equal.

A rightward force is applied by Olivia to a book in order to move it across a desk with a rightward acceleration. Consider frictional forces. Neglect air resistance.

Myah and Isabella are playing ice hockey (ignore friction). Myah hits the puck towards the goal to score the winning point! In the moment AFTER she hits the puck, which force(s) act on the puck.

• No forces

Draw and label (include ons, bys) a qualitative force diagram that represents the situation. Use marks on the vectors to indicate which forces are equal.

Barkey rests a backpack upon his shoulder. The pack is suspended motionless by one strap from one shoulder.

Draw and label (include ons, bys) a qualitative force diagram that represents the situation. Use marks on the vectors to indicate which forces are equal.

Hallie's car is coasting to the right and slowing down. Neglect air resistance.