Physics 1

• What is the mass of the crate mentioned in the study material?


  70 kg
• How is work done calculated when lifting an object?


  Work done = force x distance
• If the force exerted to lift the crate is 686 N, what is the work done when lifted 0.5 m?


  343 J
• What is the work done when the crate is lifted a vertical distance of 0.5 m?


  343 J
• What happens when a brick is pushed but does not move?

  • The pushing force is equal to the friction force.
  • The force downwards isn't strong enough.
  • A larger pushing force will make the brick slide across the table.
• What is the mass of the bar lifted by the powerlifter?


  180 kg
• How do you calculate the weight force acting on an object?


  Weight = mass x strength of gravity
• What is the weight force acting on a 180 kg bar with a gravitational field strength of 10 N/kg?


  1800 N
• What is the work done by the powerlifter when lifting the bar a distance of 2.1 m?


  3780 J
• How do you calculate the work done when lifting an object with a constant force?


  Work done = force x distance
• What is the work done by the powerlifter when lifting the bar?


  3780 J
• What happens when the forces acting on a strip of plasticine are increased?


  • The strip moves in the direction of the greater force.
  • It may undergo plastic deformation or break.
• What happens when the forces acting on a strip of plasticine are removed?


  • The strip does not move.
  • Plastic deformation occurs, and it returns to its original state.
• What happens to a spring when forces are applied and then removed?


  • The spring will contract when forces are applied.
  • It returns to its original state when forces are removed.
• What does the graph showing the increase in length of a spring against load indicate?


  It shows the relationship between the load applied and the extension of the spring.
• What is the gravitational field strength used in the calculations?


  10 N/kg