Forces & Motion

Newtons first law is that a body will remain at rest or in uniform motion in a straight line until an external force acts upon it to change it state of motion. Which of these is a sporting example?

• Tumble turn in swimming

• Beam routine in gymnastics

• a goal kicked in afl

• a ball pitched in baseball will travel towards the batter until struck

A sprinter applies force against the block , which is equal to the force that propels him forward. This is an example of which of newtons laws?

• 1st law: an object remains at rest or will move at a constant velocity, unless acted upon by an external force

• 2nd law: the acceleration of a body is directly proportional to, and in the same direction as, the force acting on the body

• 3rd law: for every action there is an equal and opposite reaction

The tendency of an object to maintain its state of motion. A greater mass will require a greater force to move and a greater force to stop

• mass

• weight

• intertia

• velocity

The rate of change of velocity. A swimmer shows this when they move from stationary into a dive

• Speed

• Acceleration

• Friction

• Velocity

Which law of motion explains how a rocket lifts off the ground?

• Newton's 1st Law of Motion
• Newton's 2nd Law of Motion
• Newton's 3rd Law of Motion

A 20 kg bike accelerates at 10 m/s². what was the force?

• 2 Newtons

• 20 Newtons

• 200 Newtons

• 10 Newtons

A ball with mass m is struck by a bat having a mass of 9m. How does the force exerted by the bat on the ball compare to the force exerted by the ball on the bat?

• The force of the bat on the ball is less than the force of the ball on the bat.

• The force of the bat on the ball is the same as the force of the ball on the bat.

• The force of the bat on the ball is greater than the force of the ball on the bat.

If Steve throws the football 50 meters in 3 seconds, what is the average speed (velocity) of the football?

• 0.06 m/s
• 16.7 m/s
• 150 m/s
• 53 m/s

If it takes Heather 3 seconds to run from the batter's box to first base at an average speed of 6.5 meters per second, what is the distance she covers in that time?

• 19.5 m
• 0.46 m
• 2.2 m
• 3.5 m

Bart ran 5,000 meters from Heather at an average speed of 6 meters/second before she caught up to him. How long did he run?

• 30,000 s
• 0.0012 s
• 833.3 s
• 212 s