Forces and Motion

What is the calculation for speed?

• Speed = Distance/Time

• Speed = Distance x Time

• Speed = Time/Distance

If John walks 1 km in 10 mins, what is his speed?

Answer in m/s rounded to 3 decimal places.

• 1.667m/s

• 2.446m/s

• 1.666m/s

• 2.778m/s

True or False: In a Distance-Time Graph, the steeper the slope the slower the object.

• True

• False

• False, the steeper the slope, the faster the object is.

True or False: In a Distance-Time Graph, a curve represents a changing speed.

• True

• False

• False, it represents a steady speed.

A red car and a blue car are moving towards each other on the same straight line. The red car's speed is 60 km/h, the blue car's speed is 50 km/h. What is the speed of the red car relative to the blue car?

• 10 km/h

• 50 km/h

• 60 km/h

• 110 km/h

A car and a bike are moving in the same direction on the same straight line. The car's speed is 50 km/h, the bike's speed is 10 km/h. What is the speed of the car relative to the bike?

• 60 km/h

• 10 km/h

• 50 km/h

• 40 km/h

True or False: Forces are nearly always pushes and pulls.

• True

• False

Forces can make an object do all of these things, EXCEPT...

• Slow down or Stop moving

• Change Direction

• Turn

• Change shape

• It can do all of the above

What is Friction?

• It is a force that always acts in the same direction as movement.

• It is a force that sometimes acts in the same direction as movement.

• It is a force that always acts in the opposite direction as movement.

• It is a force that sometimes acts in the opposite direction as movement.

• It is the scientific name for movement.

What is an advantage to Friction?

• It allows things to start and stop

• It allows you to breathe

• It supports your muscles